1a [Murine hepatitis virus strain S/3239-17]
Protein Classification
List of domain hits
| Name | Accession | Description | Interval | E-value | |||||||||
| TM_Y_MHV-like_Nsp3_C | cd21714 | C-terminus of non-structural protein 3, including transmembrane and Y domains, from murine ... |
2283-2837 | 0e+00 | |||||||||
C-terminus of non-structural protein 3, including transmembrane and Y domains, from murine hepatitis virus and betacoronavirus in the A lineage; This model represents the C-terminus of non-structural protein 3 (Nsp3) from betacoronavirus in the embecovirus subgenus (A lineage), including murine hepatitis virus (MHV) and Human coronavirus HKU1. This conserved C-terminus includes two transmembrane (TM) regions TM1 and TM2, an ectodomain (3Ecto) between the TM1 and TM2 that is glycosylated and located on the lumenal side of the ER, an amphiphatic region (AH1) that is not membrane-spanning, and a large Y domain of approximately 370 residues. Nsp3 is a large multi-functional multi-domain protein that is an essential component of the replication/transcription complex (RTC), which carries out RNA synthesis, RNA processing, and interference with the host cell innate immune system. In MHV and the related Severe acute respiratory syndrome-related coronavirus (SARS-CoV), the TM1, 3Ecto and TM2 domains are important for the papain-like protease (PL2pro) domain to process Nsp3-Nsp4 cleavage. It has also been shown that the interaction of 3Ecto with the lumenal loop of Nsp4 is essential for ER rearrangements in cells infected with SARS-CoV or MHV. The Y domain, located at the cytosolic side of the ER, consists of the Y1 and CoV-Y subdomains, which are conserved in nidovirus and coronavirus, respectively. Functional information about the Y domain is limited; it has been shown that Nsp3 binding to Nsp4 is less efficient without the Y domain. : Pssm-ID: 409662 Cd Length: 555 Bit Score: 1095.19 E-value: 0e+00
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| betaCoV_Nsp2_MHV-like | cd21519 | betacoronavirus non-structural protein 2 (Nsp2) similar to MHV Nsp2/p65 and related proteins ... |
250-832 | 0e+00 | |||||||||
betacoronavirus non-structural protein 2 (Nsp2) similar to MHV Nsp2/p65 and related proteins from betacoronaviruses in the A lineage; Coronavirus non-structural proteins (Nsps) are encoded in ORF1a and ORF1b. Post infection, the genomic RNA is released into the cytoplasm of the cell and translated into two long polyproteins (pp), pp1a and pp1ab, which are then autoproteolytically cleaved by two viral proteases Nsp3 and Nsp5 into smaller subunits. Nsp2 is one of these subunits. This subgroup includes Nsp2 from Murine hepatitis virus (MHV) and betacoronaviruses in the embecovirus subgenus (A lineage). It belongs to a family which includes Severe acute respiratory syndrome coronavirus (SARS-CoV) Nsp2. The function of Nsp2 remains unclear. SARS-CoV Nsp2, rather than playing a role in viral replication, may be involved in altering the host cell environment; deletion of Nsp2 from the SARS-CoV genome results in only a modest reduction in viral titers, and it has been shown to interact with two host proteins, prohibitin 1 (PHB1) and PHB2 which have been implicated in cellular functions, including cell-cycle progression, cell migration, cellular differentiation, apoptosis, and mitochondrial biogenesis. MHV Nsp2, also known as p65, different from SARS-CoV Nsp2, may play an important role in the viral life cycle. : Pssm-ID: 394870 Cd Length: 586 Bit Score: 1072.77 E-value: 0e+00
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| B-CoV_A_NSP1 | pfam11963 | Betacoronavirus, lineage A, NSP1; This family the N-terminal region of the Betacoronavirus ... |
1-355 | 0e+00 | |||||||||
Betacoronavirus, lineage A, NSP1; This family the N-terminal region of the Betacoronavirus polyprotein which contains non-structural protein 1 (Nsp1) from Betacoronavirus lineage A. This protein is important for viral replication and pathogenesis. It suppresses the host innate immune functions by inhibiting type I interferon expression and host antiviral signalling pathways. : Pssm-ID: 152398 Cd Length: 355 Bit Score: 678.97 E-value: 0e+00
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| betaCoV_Nsp5_Mpro | cd21666 | betacoronavirus non-structural protein 5, also called Main protease (Mpro); This subfamily ... |
3338-3631 | 0e+00 | |||||||||
betacoronavirus non-structural protein 5, also called Main protease (Mpro); This subfamily contains the coronavirus (CoV) non-structural protein 5 (Nsp5) also called the Main protease (Mpro), or 3C-like protease (3CLpro), found in betacoronaviruses. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. Mpro/Nsp5 is a key enzyme in this process, making it a high value target for the development of anti-coronavirus therapeutics. These enzymes belong to the MEROPS peptidase C30 family, where the active site residues His and Cys form a catalytic dyad. The structures of Mpro/Nsp5 consist of three domains with the first two containing anti-parallel beta barrels and the third consisting of an arrangement of alpha-helices. The catalytic residues are found in a cleft between the first two domains. Mpro requires a Gln residue in the P1 position of the substrate and space for only small amino-acid residues such as Gly, Ala, or Ser in the P1' position; since there is no known human protease with a specificity for Gln at the cleavage site of the substrate, these viral proteases are suitable targets for the development of antiviral drugs. : Pssm-ID: 394887 Cd Length: 297 Bit Score: 577.82 E-value: 0e+00
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| cv_Nsp4_TM | cd21473 | coronavirus non-structural protein 4 (Nsp4) transmembrane domain; Nsp4 may be involved in ... |
2849-3231 | 8.99e-164 | |||||||||
coronavirus non-structural protein 4 (Nsp4) transmembrane domain; Nsp4 may be involved in coronavirus-induced membrane remodeling. In order to assemble the replication-transcription complex (RTC), coronavirus induces the rearrangement of host endoplasmic reticulum (ER) membrane into double membrane vesicles (DMVs), zippered ER, or ER spherules. DMV formation has been observed in SARS-CoV cells overexpressing the three transmembrane-containing non-structural proteins of viral replicase polyprotein 1ab: Nsp3, Nsp4 and Nsp6. Together, Nsp3, Nsp4, and Nsp6 have the ability to induce the formation of DMVs that are similar to those seen in SARS-CoV-infected cells. : Pssm-ID: 394836 Cd Length: 376 Bit Score: 511.37 E-value: 8.99e-164
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| betaCoV_PLPro | cd21732 | betacoronavirus papain-like protease; This model represents the papain-like protease (PLPro) ... |
1611-1908 | 7.98e-161 | |||||||||
betacoronavirus papain-like protease; This model represents the papain-like protease (PLPro) found in non-structural protein 3 (Nsp3) of betacoronavirus, including highly pathogenic betacoronaviruses such as Severe acute respiratory syndrome-related coronavirus (SARS-CoV), SARS-CoV2 (also called 2019 novel CoV or 2019-nCoV), and Middle East respiratory syndrome-related (MERS) CoV. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. PLPro is a key enzyme in this process, making it a high value target for the development of anti-coronavirus therapeutics. PLPro, which belongs to the MEROPS peptidase C16 family, participates in the proteolytic processing of the N-terminal region of the replicase polyprotein; it can cleave Nsp1|Nsp2, Nsp2|Nsp3, and Nsp3|Nsp4 sites and its activity is dependent on zinc. In SARS-CoV and murine hepatitis virus (MHV), the C-terminal non-structural protein 3 region spanning transmembrane regions TM1 and TM2 with 3Ecto domain in between, are important for the PL2pro domain to process Nsp3-Nsp4 cleavage. Besides cleaving the polyproteins, PLPro also possesses a related enzymatic activity to promote virus replication: deubiquitinating (DUB) and de-ISGylating activities. Both, ubiquitin (Ub) and Ub-like interferon-stimulated gene product 15 (ISG15), are involved in preventing viral infection; coronaviruses utilize Ubl-conjugating pathways to counter the pro-inflammatory properties of Ubl-conjugated host proteins via the action of PLPro, which processes both 'Lys-48'- and 'Lys-63'-linked polyubiquitin chains from cellular substrates. The Nsp3 PLPro domain of many of these CoVs has also been shown to antagonize host innate immune induction of type I interferon by interacting with IRF3 and blocking its activation. Interactions of SARS-CoV and MERS-CoV with antiviral interferon (IFN) responses of human cells are remarkably different; high-dose IFN treatment (type I and type III) shows MERS-CoV was substantially more IFN sensitive than SARS-CoV. This may be due to differences in the architecture of the oxyanion hole and of the S3 as well as the S5 specificity sites, despite the overall structures of SARS-CoV and MERS-CoV PLPro being similar. : Pssm-ID: 409649 Cd Length: 304 Bit Score: 499.81 E-value: 7.98e-161
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| betaCoV-Nsp6 | cd21560 | betacoronavirus non-structural protein 6; Coronaviruses (CoV) redirect and rearrange host cell ... |
3638-3924 | 2.53e-150 | |||||||||
betacoronavirus non-structural protein 6; Coronaviruses (CoV) redirect and rearrange host cell membranes as part of the viral genome replication and transcription machinery; they induce the formation of double-membrane vesicles in infected cells. CoV non-structural protein 6 (Nsp6), a transmembrane-containing protein, together with Nsp3 and Nsp4, have the ability to induce double-membrane vesicles that are similar to those observed in severe acute respiratory syndrome (SARS) coronavirus-infected cells. By itself, Nsp6 can generate autophagosomes from the endoplasmic reticulum. Autophagosomes are normally generated as a cellular response to starvation to carry cellular organelles and long-lived proteins to lysosomes for degradation. Degradation through autophagy may provide an innate defense against virus infection, or conversely, autophagosomes can promote infection by facilitating the assembly of replicase proteins. In addition to initiating autophagosome formation, Nsp6 also limits autophagosome expansion regardless of how they were induced, i.e. whether they were induced directly by Nsp6, or indirectly by starvation or chemical inhibition of MTOR signaling. This may favor coronavirus infection by compromising the ability of autophagosomes to deliver viral components to lysosomes for degradation. : Pssm-ID: 394846 Cd Length: 290 Bit Score: 469.03 E-value: 2.53e-150
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| Peptidase_C16 super family | cl03374 | Peptidase C16 family; |
1086-1334 | 1.93e-129 | |||||||||
Peptidase C16 family; The actual alignment was detected with superfamily member pfam01831: Pssm-ID: 460353 Cd Length: 249 Bit Score: 407.16 E-value: 1.93e-129
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| betaCoV_Nsp8 | cd21831 | betacoronavirus non-structural protein 8; This model represents the non-structural protein 8 ... |
4017-4210 | 1.58e-116 | |||||||||
betacoronavirus non-structural protein 8; This model represents the non-structural protein 8 (Nsp8) the highly pathogenic betacoronaviruses that include Severe acute respiratory syndrome-related coronavirus (SARS-CoV), SARS-CoV2 (also called 2019 novel CoV or 2019-nCoV), and Middle East respiratory syndrome-related (MERS) CoV. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. Upon processing of the Nsp7-10 region by protease M (Mpro), the released four small proteins Nsp7, Nsp8, Nsp9, and Nsp10 form functional complexes with CoV core enzymes and thereby stimulate replication. Most importantly, a complex of Nsp8 with Nsp7 has been shown to activate and confer processivity to the RNA-synthesizing activity of Nsp12, the RNA-dependent RNA-polymerase (RdRp); in SARS-CoV, point mutations in the genes encoding Nsp8 and Nsp7 have been shown to delay virus growth. Nsp8 and Nsp7 cooperate in activating the primer-dependent activity of the Nsp12 RdRp such that the level of their association may constitute a limiting factor for obtaining a high RNA polymerase activity. The subsequent Nsp7/Nsp8/Nsp12 polymerase complex is then able to associate with an active bifunctional Nsp14, which includes N-terminal 3' to 5' exoribonuclease (ExoN) and C-terminal N7-guanine cap methyltransferase (N7-MTase) activities, thus representing a unique coronavirus Nsp assembly that incorporates RdRp, exoribonuclease, and N7-MTase activities. Interaction of Nsp8 with Nsp7 appears to be conserved across the coronavirus family, making these proteins interesting drug targets. Nsp8 has a novel 'golf-club' fold composed of an N-terminal 'shaft' domain and a C-terminal 'head' domain. The shaft domain contains three helices, one of which is very long, while the head domain contains another three helices and seven beta-strands, forming an alpha/beta fold. SARS-CoV Nsp8 forms a 8:8 hexadecameric supercomplex with Nsp7 that adopts a hollow cylinder-like structure with a large central channel and positive electrostatic properties in the cylinder; the Nsp7/Nsp8 complex functions as a noncanonical RNA polymerase capable of synthesizing RNA of up to the template length. : Pssm-ID: 409258 Cd Length: 196 Bit Score: 367.96 E-value: 1.58e-116
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| alpha_betaCoV_Nsp10 | cd21901 | alphacoronavirus and betacoronavirus non-structural protein 10; This model represents the ... |
4321-4450 | 5.37e-85 | |||||||||
alphacoronavirus and betacoronavirus non-structural protein 10; This model represents the non-structural protein 10 (Nsp10) of alpha- and betacoronaviruses, including highly pathogenic betacoronaviruses such as Severe acute respiratory syndrome-related coronavirus (SARS-CoV), SARS-CoV2 (also called 2019 novel CoV or 2019-nCoV), Middle East respiratory syndrome-related (MERS) CoV, and alphacoronaviruses such as Human coronavirus 229E. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. Upon processing of the Nsp7-10 region by protease M (Mpro), the released four small proteins Nsp7, Nsp8, Nsp9, and Nsp10 form functional complexes with CoV core enzymes and thereby stimulate replication. Coronaviruses cap their mRNAs; RNA cap methylation may involve at least three proteins: Nsp10, Nsp14, and Nsp16. Nsp10 serves as a cofactor for both Nsp14 and Nsp16. Nsp14 consists of 2 domains with different enzymatic activities: an N-terminal ExoN domain and a C-terminal cap (guanine-N7) methyltransferase (N7-MTase) domain. The association of Nsp10 with Nsp14 enhances Nsp14's exoribonuclease (ExoN) activity, and not its N7-Mtase activity. ExoN is important for proofreading and therefore, the prevention of lethal mutations. The Nsp10/Nsp14 complex hydrolyzes double-stranded RNA in a 3' to 5' direction as well as a single mismatched nucleotide at the 3'-end, mimicking an erroneous replication product, and may function in a replicative mismatch repair mechanism. Nsp16 Cap-0 specific (nucleoside-2'-O-)-methyltransferase (2'OMTase) acts sequentially to Nsp14 MTase in RNA capping methylation, and methylates the RNA cap at the ribose 2'-O position; it catalyzes the conversion of the cap-0 structure on m7GpppA-RNA to a cap-1 structure. The association of Nsp10 with Nsp16 enhances Nsp16's 2'OMTase activity, possibly through enhanced RNA binding affinity. Additionally, transmissible gastroenteritis virus (TGEV) Nsp10, Nsp16 and their complex can interact with DII4, which normally binds to Notch receptors; this interaction may disturb Notch signaling. Nsp10 also binds 2 zinc ions with high affinity. : Pssm-ID: 409326 Cd Length: 130 Bit Score: 274.55 E-value: 5.37e-85
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| MHV-like_Nsp3_NAB | cd21824 | nucleic acid binding domain of non-structural protein 3 from murine hepatitis virus and ... |
1945-2063 | 6.69e-83 | |||||||||
nucleic acid binding domain of non-structural protein 3 from murine hepatitis virus and betacoronavirus in the A lineage; This model represents the nucleic acid binding (NAB) domain of non-structural protein 3 (Nsp3) from betacoronavirus in the embecovirus subgenus (A lineage), including murine hepatitis virus (MHV) and Human coronavirus HKU1. The NAB domain represents a new fold, with a parallel four-strand beta-sheet holding two alpha-helices of three and four turns that are oriented antiparallel to the beta-strands. NAB is a cytoplasmic domain located between the papain-like protease (PLPro) and betacoronavirus-specific marker (betaSM) domains of CoV Nsp3. Nsp3 is a large multi-functional multi-domain protein that is an essential component of the replication/transcription complex (RTC), which carries out RNA synthesis, RNA processing, and interference with the host cell innate immune system. The NAB domain both binds ssRNA and unwinds dsDNA. It prefers to bind ssRNA containing repeats of three consecutive guanines. A group of residues that form a positively charged patch on the protein surface of SARS-CoV Nsp3 NAB serves as the binding site of nucleic acids. This site is conserved in the NAB of Nsp3 from betacoronavirus in the sarbecovirus subgenus (B lineage), but is not conserved in the Nsp3 NAB from betacoronaviruses in the A lineage. : Pssm-ID: 409350 Cd Length: 119 Bit Score: 268.17 E-value: 6.69e-83
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| MHV-like_Nsp3_betaSM | cd21812 | betacoronavirus-specific marker of non-structural protein 3 from murine hepatitis virus and ... |
2111-2234 | 2.60e-79 | |||||||||
betacoronavirus-specific marker of non-structural protein 3 from murine hepatitis virus and betacoronavirus in the A lineage; This model represents the betacoronavirus-specific marker (betaSM), also called group 2-specific marker (G2M), of non-structural protein 3 (Nsp3) from betacoronavirus in the embecovirus subgenus (A lineage), including murine hepatitis virus (MHV) and Human coronavirus HKU1. The betaSM/G2M is located C-terminal to the nucleic acid-binding (NAB) domain. This region is absent in alpha- and deltacoronavirus Nsp3; there is a gammacoronavirus-specific marker (gammaSM) at this position in gammacoronavirus Nsp3. Nsp3 is a large multi-functional multi-domain protein that is an essential component of the replication/transcription complex (RTC), which carries out RNA synthesis, RNA processing, and interference with the host cell innate immune system. Little is known about the betaSM/G2M domain; it is predicted to be non-enzymatic and may be an intrinsically disordered region. The betaSM/G2M domain is part of the predicted PLnc domain (made up of 385 amino acids) of the related SARS-CoV Nsp3 that may function as a replication/transcription scaffold, with interactions to Nsp5, Nsp12, Nsp13, Nsp14, and Nsp16. : Pssm-ID: 409627 Cd Length: 125 Bit Score: 258.00 E-value: 2.60e-79
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| betaCoV_Nsp9 | cd21898 | betacoronavirus non-structural protein 9; This model represents the non-structural protein 9 ... |
4211-4320 | 1.68e-69 | |||||||||
betacoronavirus non-structural protein 9; This model represents the non-structural protein 9 (Nsp9) from betacoronaviruses including highly pathogenic Severe acute respiratory syndrome-related coronavirus (SARS-CoV), SARS-CoV2 (also called 2019 novel CoV or 2019-nCoV), and Middle East respiratory syndrome-related (MERS) CoV. CoVs utilize a multi-subunit replication/transcription machinery assembled from a set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins. All of these Nsps, except for Nsp1 and Nsp2, are considered essential for transcription, replication, and translation of the viral RNA. Nsp9, with Nsp7, Nsp8, and Nsp10, localizes within the replication complex. Nsp9 is an essential single-stranded RNA-binding protein for coronavirus replication; it shares structural similarity to the oligosaccharide-binding (OB) fold, which is characteristic of proteins that bind to ssDNA or ssRNA. Nsp9 requires dimerization for binding and orienting RNA for subsequent use by the replicase machinery. CoV Nsp9s have diverse forms of dimerization that promote their biological function, which may help elucidate the mechanism underlying CoVs replication and contribute to the development of antiviral drugs. Generally, dimers are formed via interaction of the parallel alpha-helices containing the protein-protein interaction motif GXXXG; additionally, the N-finger region may also play a critical role in dimerization as seen in porcine delta coronavirus (PDCoV) Nsp9. As a member of the replication complex, Nsp9 may not have a specific RNA-binding sequence but may act in conjunction with other Nsps as a processivity factor, as shown by mutation studies indicating that Nsp9 is a key ingredient that intimately engages other proteins in the replicase complex to mediate efficient virus transcription and replication. : Pssm-ID: 409331 Cd Length: 111 Bit Score: 229.59 E-value: 1.68e-69
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| CoV_NSP4_C | pfam16348 | Coronavirus replicase NSP4, C-terminal; This is the C-terminal domain of the coronavirus ... |
3238-3332 | 3.68e-49 | |||||||||
Coronavirus replicase NSP4, C-terminal; This is the C-terminal domain of the coronavirus nonstructural protein 4 (NSP4). NSP4 is encoded by ORF1a/1ab and proteolytically released from the pp1a/1ab polyprotein. It is a membrane-spanning protein which is thought to anchor the viral replication-transcription complex (RTC) to modified endoplasmic reticulum membranes. This predominantly alpha-helical domain may be involved in protein-protein interactions. It has been shown that in Betacoronavirus, the coexpression of NSP3 and NSP4 results in a membrane rearrangement to induce double-membrane vesicles (DMVs) and convoluted membranes (CMs), playing a critical role in SARS-CoV replication. There are two well conserved amino acid residues (H120 and F121) in NSP4 among Betacoronavirus, essential for membrane rearrangements during interaction with NSP3. : Pssm-ID: 465099 Cd Length: 92 Bit Score: 170.79 E-value: 3.68e-49
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| DPUP_MHV_Nsp3 | cd21524 | DPUP (domain preceding Ubl2 and PLP2) of non-structural protein 3 (Nsp3) from murine hepatitis ... |
1536-1610 | 3.90e-46 | |||||||||
DPUP (domain preceding Ubl2 and PLP2) of non-structural protein 3 (Nsp3) from murine hepatitis virus and related betacoronaviruses in the A lineage; This subfamily contains the DPUP (domain preceding Ubl2 and PLP2) of murine hepatitis virus (MHV) non-structural protein 3 (Nsp3) and other Nsp3s from betacoronaviruses in the embecovirus subgenera (A lineage), including human CoV OC43, rabbit CoV HKU14 and porcine hemagglutinating encephalomyelitis virus (HEV), among others. Non-structural protein 3 (Nsp3) is a large multi-functional multi-domain protein that is an essential component of the replication/transcription complex (RTC), which carries out RNA synthesis, RNA processing, and interference with the host cell innate immune system. MHV Nsp3 contains a DPUP that is located N-terminal to the ubiquitin-like domain 2 (Ubl2) and papain-like protease 2 (PLP2) catalytic domain. It is structurally similar to the Severe Acute Respiratory Syndrome (SARS) CoV unique domain C (SUD-C), adopting a frataxin-like fold that has structural similarity to DNA-binding domains of DNA-modifying enzymes. SUD-C is also located N-terminal to Ubl2 and PLP2 in SARS Nsp3, similar to the DPUP of MHV Nsp3; however, unlike DPUP, it is preceded by SUD-N and SUD-M macrodomains that are absent in MHV Nsp3. Though structurally similar, there is little sequence similarity between DPUP and SUD-C. SARS SUD-C has been shown to bind to single-stranded RNA and recognize purine bases more strongly than pyrimidine bases; it also regulates the RNA binding behavior of the SARS SUD-M macrodomain. It is not known whether DPUP functions in the same way. : Pssm-ID: 394840 Cd Length: 75 Bit Score: 161.43 E-value: 3.90e-46
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| betaCoV_Nsp7 | cd21827 | betacoronavirus non-structural protein 7; This model represents the non-structural protein 7 ... |
3925-4013 | 1.22e-36 | |||||||||
betacoronavirus non-structural protein 7; This model represents the non-structural protein 7 (Nsp7) of betacoronaviruses including the highly pathogenic Severe acute respiratory syndrome-related coronavirus (SARS-CoV), SARS-CoV2 (also called 2019 novel CoV or 2019-nCoV), and Middle East respiratory syndrome-related (MERS) CoV. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. Upon processing of the Nsp7-10 region by protease M (Mpro), the released four small proteins Nsp7, Nsp8, Nsp9 and Nsp10 form functional complexes with CoV core enzymes and stimulate replication. Most importantly, a complex of Nsp7 with Nsp8 has been shown to activate and confer processivity to the RNA-synthesizing activity of Nsp12, the RNA-dependent RNA-polymerase (RdRp); in SARS-CoV, point mutations in the NSP7- or NSP8-coding region have been shown to delay virus growth. Nsp7 and Nsp8 cooperate in activating the primer-dependent activity of the Nsp12 RdRp such that the level of their association may constitute a limiting factor for obtaining a high RNA polymerase activity. The subsequent Nsp7/Nsp8/Nsp12 polymerase complex is then able to associate with an active bifunctional Nsp14, which includes N-terminal 3' to 5' exoribonuclease (ExoN) and C-terminal N7-guanine cap methyltransferase (N7-MTase) activities, thus representing a unique coronavirus Nsp assembly that incorporates RdRp, exoribonuclease, and N7-MTase activities. Interaction of Nsp7 with Nsp8 appears to be conserved across the coronavirus family, making these proteins interesting drug targets. Nsp7 has a 4-helical bundle conformation which is strongly affected by its interaction with Nsp8, especially where it concerns alpha-helix 4. SARS-CoV Nsp7 forms a 8:8 hexadecameric supercomplex with Nsp8 that adopts a hollow cylinder-like structure with a large central channel and positive electrostatic properties in the cylinder; the Nsp7/Nsp8 complex functions as a noncanonical RNA polymerase capable of synthesizing RNA of up to template length. : Pssm-ID: 409253 Cd Length: 83 Bit Score: 134.49 E-value: 1.22e-36
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| Ubl1_cv_Nsp3_N-like | cd21467 | first ubiquitin-like (Ubl) domain located at the N-terminus of coronavirus SARS-CoV ... |
852-941 | 4.99e-36 | |||||||||
first ubiquitin-like (Ubl) domain located at the N-terminus of coronavirus SARS-CoV non-structural protein 3 (Nsp3) and related proteins; This ubiquitin-like (Ubl) domain (Ubl1) is found at the N-terminus of coronavirus Nsp3, a large multi-functional multi-domain protein which is an essential component of the replication/transcription complex (RTC). The functions of Ubl1 in CoVs are related to single-stranded RNA (ssRNA) binding and to interacting with the nucleocapsid (N) protein. SARS-CoV Ubl1 has been shown to bind ssRNA having AUA patterns, and since the 5'-UTR of the SARS-CoV genome has a number of AUA repeats, it may bind there. In mouse hepatitis virus (MHV), this Ubl1 domain binds the cognate N protein. Adjacent to Ubl1 is a Glu-rich acidic region (also referred to as hypervariable region, HVR); Ubl1 together with HVR has been called Nsp3a. Currently, the function of HVR in CoVs is unknown. This model corresponds to one of two Ubl domains in Nsp3; the other is located N-terminal to the papain-like protease (PLpro) and is not represented by this model. : Pssm-ID: 394822 Cd Length: 89 Bit Score: 133.08 E-value: 4.99e-36
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| Macro_SF super family | cl00019 | macrodomain superfamily; Macrodomains are found in a variety of proteins with diverse cellular ... |
1343-1467 | 5.91e-23 | |||||||||
macrodomain superfamily; Macrodomains are found in a variety of proteins with diverse cellular functions, as a stand-alone domain or in combination with other domains like in histone macroH2A and some PARPs (poly ADP-ribose polymerases). Macrodomains can recognize ADP-ribose (ADPr) in both its free and protein-linked forms, in related ligands, such as O-acyl-ADP-ribose (OAADPr), and even in ligands unrelated to ADPr. Macrodomains include the yeast macrodomain Poa1 which is a phosphatase of ADP-ribose-1"-phosphate, a by-product of tRNA splicing. Some macrodomains have ADPr-unrelated binding partners such as the coronavirus SUD-N (N-terminal subdomain) and SUD-M (middle subdomain) of the SARS-unique domain (SUD) which bind G-quadruplexes (unusual nucleic-acid structures formed by consecutive guanosine nucleotides). Macrodomains regulate a wide variety of cellular and organismal processes, including DNA damage repair, signal transduction, and immune response. The actual alignment was detected with superfamily member cd21557: Pssm-ID: 469581 Cd Length: 127 Bit Score: 97.24 E-value: 5.91e-23
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| B-CoV_A_NSP1 super family | cl13410 | Betacoronavirus, lineage A, NSP1; This family the N-terminal region of the Betacoronavirus ... |
969-1077 | 1.58e-20 | |||||||||
Betacoronavirus, lineage A, NSP1; This family the N-terminal region of the Betacoronavirus polyprotein which contains non-structural protein 1 (Nsp1) from Betacoronavirus lineage A. This protein is important for viral replication and pathogenesis. It suppresses the host innate immune functions by inhibiting type I interferon expression and host antiviral signalling pathways. The actual alignment was detected with superfamily member pfam11963: Pssm-ID: 152398 Cd Length: 355 Bit Score: 96.55 E-value: 1.58e-20
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| Name | Accession | Description | Interval | E-value | |||||||||
| TM_Y_MHV-like_Nsp3_C | cd21714 | C-terminus of non-structural protein 3, including transmembrane and Y domains, from murine ... |
2283-2837 | 0e+00 | |||||||||
C-terminus of non-structural protein 3, including transmembrane and Y domains, from murine hepatitis virus and betacoronavirus in the A lineage; This model represents the C-terminus of non-structural protein 3 (Nsp3) from betacoronavirus in the embecovirus subgenus (A lineage), including murine hepatitis virus (MHV) and Human coronavirus HKU1. This conserved C-terminus includes two transmembrane (TM) regions TM1 and TM2, an ectodomain (3Ecto) between the TM1 and TM2 that is glycosylated and located on the lumenal side of the ER, an amphiphatic region (AH1) that is not membrane-spanning, and a large Y domain of approximately 370 residues. Nsp3 is a large multi-functional multi-domain protein that is an essential component of the replication/transcription complex (RTC), which carries out RNA synthesis, RNA processing, and interference with the host cell innate immune system. In MHV and the related Severe acute respiratory syndrome-related coronavirus (SARS-CoV), the TM1, 3Ecto and TM2 domains are important for the papain-like protease (PL2pro) domain to process Nsp3-Nsp4 cleavage. It has also been shown that the interaction of 3Ecto with the lumenal loop of Nsp4 is essential for ER rearrangements in cells infected with SARS-CoV or MHV. The Y domain, located at the cytosolic side of the ER, consists of the Y1 and CoV-Y subdomains, which are conserved in nidovirus and coronavirus, respectively. Functional information about the Y domain is limited; it has been shown that Nsp3 binding to Nsp4 is less efficient without the Y domain. Pssm-ID: 409662 Cd Length: 555 Bit Score: 1095.19 E-value: 0e+00
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| betaCoV_Nsp2_MHV-like | cd21519 | betacoronavirus non-structural protein 2 (Nsp2) similar to MHV Nsp2/p65 and related proteins ... |
250-832 | 0e+00 | |||||||||
betacoronavirus non-structural protein 2 (Nsp2) similar to MHV Nsp2/p65 and related proteins from betacoronaviruses in the A lineage; Coronavirus non-structural proteins (Nsps) are encoded in ORF1a and ORF1b. Post infection, the genomic RNA is released into the cytoplasm of the cell and translated into two long polyproteins (pp), pp1a and pp1ab, which are then autoproteolytically cleaved by two viral proteases Nsp3 and Nsp5 into smaller subunits. Nsp2 is one of these subunits. This subgroup includes Nsp2 from Murine hepatitis virus (MHV) and betacoronaviruses in the embecovirus subgenus (A lineage). It belongs to a family which includes Severe acute respiratory syndrome coronavirus (SARS-CoV) Nsp2. The function of Nsp2 remains unclear. SARS-CoV Nsp2, rather than playing a role in viral replication, may be involved in altering the host cell environment; deletion of Nsp2 from the SARS-CoV genome results in only a modest reduction in viral titers, and it has been shown to interact with two host proteins, prohibitin 1 (PHB1) and PHB2 which have been implicated in cellular functions, including cell-cycle progression, cell migration, cellular differentiation, apoptosis, and mitochondrial biogenesis. MHV Nsp2, also known as p65, different from SARS-CoV Nsp2, may play an important role in the viral life cycle. Pssm-ID: 394870 Cd Length: 586 Bit Score: 1072.77 E-value: 0e+00
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| B-CoV_A_NSP1 | pfam11963 | Betacoronavirus, lineage A, NSP1; This family the N-terminal region of the Betacoronavirus ... |
1-355 | 0e+00 | |||||||||
Betacoronavirus, lineage A, NSP1; This family the N-terminal region of the Betacoronavirus polyprotein which contains non-structural protein 1 (Nsp1) from Betacoronavirus lineage A. This protein is important for viral replication and pathogenesis. It suppresses the host innate immune functions by inhibiting type I interferon expression and host antiviral signalling pathways. Pssm-ID: 152398 Cd Length: 355 Bit Score: 678.97 E-value: 0e+00
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| betaCoV_Nsp5_Mpro | cd21666 | betacoronavirus non-structural protein 5, also called Main protease (Mpro); This subfamily ... |
3338-3631 | 0e+00 | |||||||||
betacoronavirus non-structural protein 5, also called Main protease (Mpro); This subfamily contains the coronavirus (CoV) non-structural protein 5 (Nsp5) also called the Main protease (Mpro), or 3C-like protease (3CLpro), found in betacoronaviruses. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. Mpro/Nsp5 is a key enzyme in this process, making it a high value target for the development of anti-coronavirus therapeutics. These enzymes belong to the MEROPS peptidase C30 family, where the active site residues His and Cys form a catalytic dyad. The structures of Mpro/Nsp5 consist of three domains with the first two containing anti-parallel beta barrels and the third consisting of an arrangement of alpha-helices. The catalytic residues are found in a cleft between the first two domains. Mpro requires a Gln residue in the P1 position of the substrate and space for only small amino-acid residues such as Gly, Ala, or Ser in the P1' position; since there is no known human protease with a specificity for Gln at the cleavage site of the substrate, these viral proteases are suitable targets for the development of antiviral drugs. Pssm-ID: 394887 Cd Length: 297 Bit Score: 577.82 E-value: 0e+00
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| Peptidase_C30 | pfam05409 | Coronavirus endopeptidase C30; This Coronavirus (CoV) domain, peptidase C30, is also known as ... |
3363-3637 | 3.40e-168 | |||||||||
Coronavirus endopeptidase C30; This Coronavirus (CoV) domain, peptidase C30, is also known as 3C-like proteinase (3CL-pro), or CoV main protease (M-pro) domain. CoV M-pro is a dimer where each subunit is composed of three domains I, II and III,,. Domains I and II consist of six-stranded antiparallel beta barrels and together resemble the architecture of chymotrypsin, and of picornaviruses 3C proteinases. The substrate-binding site is located in a cleft between these two domains. The catalytic site is situated at the centre of the cleft. A long loop connects domain II to the C-terminal domain (domain III). This latter domain has been implicated in the proteolytic activity of M-pro. In the active site of M-pro, Cys and His form a catalytic dyad,. Pssm-ID: 398852 Cd Length: 274 Bit Score: 519.31 E-value: 3.40e-168
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| cv_Nsp4_TM | cd21473 | coronavirus non-structural protein 4 (Nsp4) transmembrane domain; Nsp4 may be involved in ... |
2849-3231 | 8.99e-164 | |||||||||
coronavirus non-structural protein 4 (Nsp4) transmembrane domain; Nsp4 may be involved in coronavirus-induced membrane remodeling. In order to assemble the replication-transcription complex (RTC), coronavirus induces the rearrangement of host endoplasmic reticulum (ER) membrane into double membrane vesicles (DMVs), zippered ER, or ER spherules. DMV formation has been observed in SARS-CoV cells overexpressing the three transmembrane-containing non-structural proteins of viral replicase polyprotein 1ab: Nsp3, Nsp4 and Nsp6. Together, Nsp3, Nsp4, and Nsp6 have the ability to induce the formation of DMVs that are similar to those seen in SARS-CoV-infected cells. Pssm-ID: 394836 Cd Length: 376 Bit Score: 511.37 E-value: 8.99e-164
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| betaCoV_PLPro | cd21732 | betacoronavirus papain-like protease; This model represents the papain-like protease (PLPro) ... |
1611-1908 | 7.98e-161 | |||||||||
betacoronavirus papain-like protease; This model represents the papain-like protease (PLPro) found in non-structural protein 3 (Nsp3) of betacoronavirus, including highly pathogenic betacoronaviruses such as Severe acute respiratory syndrome-related coronavirus (SARS-CoV), SARS-CoV2 (also called 2019 novel CoV or 2019-nCoV), and Middle East respiratory syndrome-related (MERS) CoV. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. PLPro is a key enzyme in this process, making it a high value target for the development of anti-coronavirus therapeutics. PLPro, which belongs to the MEROPS peptidase C16 family, participates in the proteolytic processing of the N-terminal region of the replicase polyprotein; it can cleave Nsp1|Nsp2, Nsp2|Nsp3, and Nsp3|Nsp4 sites and its activity is dependent on zinc. In SARS-CoV and murine hepatitis virus (MHV), the C-terminal non-structural protein 3 region spanning transmembrane regions TM1 and TM2 with 3Ecto domain in between, are important for the PL2pro domain to process Nsp3-Nsp4 cleavage. Besides cleaving the polyproteins, PLPro also possesses a related enzymatic activity to promote virus replication: deubiquitinating (DUB) and de-ISGylating activities. Both, ubiquitin (Ub) and Ub-like interferon-stimulated gene product 15 (ISG15), are involved in preventing viral infection; coronaviruses utilize Ubl-conjugating pathways to counter the pro-inflammatory properties of Ubl-conjugated host proteins via the action of PLPro, which processes both 'Lys-48'- and 'Lys-63'-linked polyubiquitin chains from cellular substrates. The Nsp3 PLPro domain of many of these CoVs has also been shown to antagonize host innate immune induction of type I interferon by interacting with IRF3 and blocking its activation. Interactions of SARS-CoV and MERS-CoV with antiviral interferon (IFN) responses of human cells are remarkably different; high-dose IFN treatment (type I and type III) shows MERS-CoV was substantially more IFN sensitive than SARS-CoV. This may be due to differences in the architecture of the oxyanion hole and of the S3 as well as the S5 specificity sites, despite the overall structures of SARS-CoV and MERS-CoV PLPro being similar. Pssm-ID: 409649 Cd Length: 304 Bit Score: 499.81 E-value: 7.98e-161
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| MHV-like_Nsp1 | cd21879 | non-structural protein 1 from murine hepatitis virus and betacoronavirus in the A lineage; ... |
6-242 | 2.13e-150 | |||||||||
non-structural protein 1 from murine hepatitis virus and betacoronavirus in the A lineage; This model represents the non-structural protein 1 (Nsp1) from betacoronavirus in the embecovirus subgenus (A lineage), including murine hepatitis virus (MHV), bovine coronavirus (BCoV) and Human coronavirus HKU1. CoVs utilize a multi-subunit replication/transcription machinery assembled from a set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins. Nsp1 is the N-terminal cleavage product released from the ORF1a polyprotein by the action of papain-like protease (PLpro). Though Nsp1s of alphaCoVs and betaCoVs share structural similarity, they show no significant sequence similarity and may be considered as genus-specific markers. Despite low sequence similarity, the Nsp1s of alphaCoVs and betaCoVs exhibit remarkably similar biological functions, and are involved in the regulation of both host and viral gene expression. CoV Nsp1 induces suppression of host gene expression and interferes with host immune response. It inhibits host gene expression in two ways: by targeting the translation and stability of cellular mRNAs, and by inhibiting mRNA translation and inducing an endonucleolytic RNA cleavage in the 5'-UTR of cellular mRNAs through its tight association with the 40S ribosomal subunit, a key component of the cellular translation machinery. Inhibition of host mRNA translation includes that of type I interferons, major components of the host innate immune response. Nsp1 is critical in regulating viral replication and gene expression, as shown by multiple evidences, including: mutations in the Nsp1 coding region of the transmissible gastroenteritis virus (TGEV) and MHV genomes cause drastic reduction or elimination of infectious virus; BCoV Nsp1 is an RNA-binding protein that interacts with cis-acting replication elements in the 5'-UTR of the BCoV genome, implying its potential role in the regulation of viral translation or replication; and SARS-CoV Nsp1 enhances virus replication by binding to a stem-loop structure in the 5'-UTR of its genome. Pssm-ID: 409341 Cd Length: 236 Bit Score: 466.86 E-value: 2.13e-150
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| betaCoV-Nsp6 | cd21560 | betacoronavirus non-structural protein 6; Coronaviruses (CoV) redirect and rearrange host cell ... |
3638-3924 | 2.53e-150 | |||||||||
betacoronavirus non-structural protein 6; Coronaviruses (CoV) redirect and rearrange host cell membranes as part of the viral genome replication and transcription machinery; they induce the formation of double-membrane vesicles in infected cells. CoV non-structural protein 6 (Nsp6), a transmembrane-containing protein, together with Nsp3 and Nsp4, have the ability to induce double-membrane vesicles that are similar to those observed in severe acute respiratory syndrome (SARS) coronavirus-infected cells. By itself, Nsp6 can generate autophagosomes from the endoplasmic reticulum. Autophagosomes are normally generated as a cellular response to starvation to carry cellular organelles and long-lived proteins to lysosomes for degradation. Degradation through autophagy may provide an innate defense against virus infection, or conversely, autophagosomes can promote infection by facilitating the assembly of replicase proteins. In addition to initiating autophagosome formation, Nsp6 also limits autophagosome expansion regardless of how they were induced, i.e. whether they were induced directly by Nsp6, or indirectly by starvation or chemical inhibition of MTOR signaling. This may favor coronavirus infection by compromising the ability of autophagosomes to deliver viral components to lysosomes for degradation. Pssm-ID: 394846 Cd Length: 290 Bit Score: 469.03 E-value: 2.53e-150
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| CoV_NSP3_C | pfam19218 | Coronavirus replicase NSP3, C-terminal; This family represents the C-terminal region of ... |
2337-2824 | 3.72e-144 | |||||||||
Coronavirus replicase NSP3, C-terminal; This family represents the C-terminal region of non-structural protein NSP3 (also known as nsp3). NSP3 is the product of ORF1a. It is found in human SARS coronavirus polyprotein 1a and 1ab, and in related coronavirus polyproteins. It is a multifunctional protein comprising up to 16 different domains and regions. NSP3 binds to viral RNA, nucleocapsid protein, as well as other viral proteins and participates in polyprotein processing. Pssm-ID: 466002 Cd Length: 463 Bit Score: 458.72 E-value: 3.72e-144
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| CoV_NSP4_N | pfam19217 | Coronavirus replicase NSP4, N-terminal; This is the N-terminal domain of the coronavirus ... |
2860-3216 | 4.26e-140 | |||||||||
Coronavirus replicase NSP4, N-terminal; This is the N-terminal domain of the coronavirus nonstructural protein 4 (NSP4). NSP4 is encoded by ORF1a/1ab and proteolytically released from the pp1a/1ab polyprotein. NSP4 is a membrane-spanning protein which is thought to anchor the viral replication-transcription complex to modified endoplasmic reticulum membranes. This N-terminal region represents the membrane spanning region, covering four transmembrane regions. Pssm-ID: 466001 Cd Length: 351 Bit Score: 442.48 E-value: 4.26e-140
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| Peptidase_C16 | pfam01831 | Peptidase C16 family; |
1086-1334 | 1.93e-129 | |||||||||
Peptidase C16 family; Pssm-ID: 460353 Cd Length: 249 Bit Score: 407.16 E-value: 1.93e-129
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| betaCoV_Nsp8 | cd21831 | betacoronavirus non-structural protein 8; This model represents the non-structural protein 8 ... |
4017-4210 | 1.58e-116 | |||||||||
betacoronavirus non-structural protein 8; This model represents the non-structural protein 8 (Nsp8) the highly pathogenic betacoronaviruses that include Severe acute respiratory syndrome-related coronavirus (SARS-CoV), SARS-CoV2 (also called 2019 novel CoV or 2019-nCoV), and Middle East respiratory syndrome-related (MERS) CoV. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. Upon processing of the Nsp7-10 region by protease M (Mpro), the released four small proteins Nsp7, Nsp8, Nsp9, and Nsp10 form functional complexes with CoV core enzymes and thereby stimulate replication. Most importantly, a complex of Nsp8 with Nsp7 has been shown to activate and confer processivity to the RNA-synthesizing activity of Nsp12, the RNA-dependent RNA-polymerase (RdRp); in SARS-CoV, point mutations in the genes encoding Nsp8 and Nsp7 have been shown to delay virus growth. Nsp8 and Nsp7 cooperate in activating the primer-dependent activity of the Nsp12 RdRp such that the level of their association may constitute a limiting factor for obtaining a high RNA polymerase activity. The subsequent Nsp7/Nsp8/Nsp12 polymerase complex is then able to associate with an active bifunctional Nsp14, which includes N-terminal 3' to 5' exoribonuclease (ExoN) and C-terminal N7-guanine cap methyltransferase (N7-MTase) activities, thus representing a unique coronavirus Nsp assembly that incorporates RdRp, exoribonuclease, and N7-MTase activities. Interaction of Nsp8 with Nsp7 appears to be conserved across the coronavirus family, making these proteins interesting drug targets. Nsp8 has a novel 'golf-club' fold composed of an N-terminal 'shaft' domain and a C-terminal 'head' domain. The shaft domain contains three helices, one of which is very long, while the head domain contains another three helices and seven beta-strands, forming an alpha/beta fold. SARS-CoV Nsp8 forms a 8:8 hexadecameric supercomplex with Nsp7 that adopts a hollow cylinder-like structure with a large central channel and positive electrostatic properties in the cylinder; the Nsp7/Nsp8 complex functions as a noncanonical RNA polymerase capable of synthesizing RNA of up to the template length. Pssm-ID: 409258 Cd Length: 196 Bit Score: 367.96 E-value: 1.58e-116
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| CoV_NSP8 | pfam08717 | Coronavirus replicase NSP8; Viral NSP8 (non structural protein 8) forms a hexadecameric ... |
4014-4209 | 4.88e-105 | |||||||||
Coronavirus replicase NSP8; Viral NSP8 (non structural protein 8) forms a hexadecameric supercomplex with NSP7 that adopts a hollow cylinder-like structure. The dimensions of the central channel and positive electrostatic properties of the cylinder imply that it confers processivity on RNA-dependent RNA polymerase. NSP7 and NSP8 heterodimers play a role in the stabilization of NSP12 regions involved in RNA binding and are essential for a highly active NSP12 polymerase complex. It has been demonstrated that NSP8 acts as an oligo(U)-templated polyadenylyltransferase but also has robust (mono/oligo) adenylate transferase activities. NSP8 has N- and C-terminal D/ExD/E conserved motifs, being the N-terminal motif critical for RNA polymerase activity as these residues are part of the Mg2-binding active site. Pssm-ID: 400866 Cd Length: 197 Bit Score: 334.89 E-value: 4.88e-105
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| alpha_betaCoV_Nsp10 | cd21901 | alphacoronavirus and betacoronavirus non-structural protein 10; This model represents the ... |
4321-4450 | 5.37e-85 | |||||||||
alphacoronavirus and betacoronavirus non-structural protein 10; This model represents the non-structural protein 10 (Nsp10) of alpha- and betacoronaviruses, including highly pathogenic betacoronaviruses such as Severe acute respiratory syndrome-related coronavirus (SARS-CoV), SARS-CoV2 (also called 2019 novel CoV or 2019-nCoV), Middle East respiratory syndrome-related (MERS) CoV, and alphacoronaviruses such as Human coronavirus 229E. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. Upon processing of the Nsp7-10 region by protease M (Mpro), the released four small proteins Nsp7, Nsp8, Nsp9, and Nsp10 form functional complexes with CoV core enzymes and thereby stimulate replication. Coronaviruses cap their mRNAs; RNA cap methylation may involve at least three proteins: Nsp10, Nsp14, and Nsp16. Nsp10 serves as a cofactor for both Nsp14 and Nsp16. Nsp14 consists of 2 domains with different enzymatic activities: an N-terminal ExoN domain and a C-terminal cap (guanine-N7) methyltransferase (N7-MTase) domain. The association of Nsp10 with Nsp14 enhances Nsp14's exoribonuclease (ExoN) activity, and not its N7-Mtase activity. ExoN is important for proofreading and therefore, the prevention of lethal mutations. The Nsp10/Nsp14 complex hydrolyzes double-stranded RNA in a 3' to 5' direction as well as a single mismatched nucleotide at the 3'-end, mimicking an erroneous replication product, and may function in a replicative mismatch repair mechanism. Nsp16 Cap-0 specific (nucleoside-2'-O-)-methyltransferase (2'OMTase) acts sequentially to Nsp14 MTase in RNA capping methylation, and methylates the RNA cap at the ribose 2'-O position; it catalyzes the conversion of the cap-0 structure on m7GpppA-RNA to a cap-1 structure. The association of Nsp10 with Nsp16 enhances Nsp16's 2'OMTase activity, possibly through enhanced RNA binding affinity. Additionally, transmissible gastroenteritis virus (TGEV) Nsp10, Nsp16 and their complex can interact with DII4, which normally binds to Notch receptors; this interaction may disturb Notch signaling. Nsp10 also binds 2 zinc ions with high affinity. Pssm-ID: 409326 Cd Length: 130 Bit Score: 274.55 E-value: 5.37e-85
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| CoV_NSP6 | pfam19213 | Coronavirus replicase NSP6; This entry represents proteins found in Coronaviruses and includes ... |
3665-3924 | 5.12e-84 | |||||||||
Coronavirus replicase NSP6; This entry represents proteins found in Coronaviruses and includes the Non-structural Protein 6 (NSP6). Coronaviruses encode large replicase polyproteins which are proteolytically processed by viral proteases to generate mature Nonstructural Proteins (NSPs). NSP6 is a membrane protein containing 6 transmembrane domains with a large C-terminal tail. NSP6 from the avian coronavirus, infectious bronchitis virus (IBV) and the mouse hepatitis virus (MHV) have been shown to localize to the ER and to generate autophagosomes. Coronavirus NSP6 proteins have also been shown to limit autophagosome expansion. This may favour coronavirus infection by reducing the ability of autophagosomes to deliver viral components to lysosomes for degradation. NSP6 from IBV, MHV and severe acute respiratory syndrome coronavirus (SARS-CoV) have also been found to activate autophagy. Pssm-ID: 465997 Cd Length: 260 Bit Score: 277.59 E-value: 5.12e-84
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| MHV-like_Nsp3_NAB | cd21824 | nucleic acid binding domain of non-structural protein 3 from murine hepatitis virus and ... |
1945-2063 | 6.69e-83 | |||||||||
nucleic acid binding domain of non-structural protein 3 from murine hepatitis virus and betacoronavirus in the A lineage; This model represents the nucleic acid binding (NAB) domain of non-structural protein 3 (Nsp3) from betacoronavirus in the embecovirus subgenus (A lineage), including murine hepatitis virus (MHV) and Human coronavirus HKU1. The NAB domain represents a new fold, with a parallel four-strand beta-sheet holding two alpha-helices of three and four turns that are oriented antiparallel to the beta-strands. NAB is a cytoplasmic domain located between the papain-like protease (PLPro) and betacoronavirus-specific marker (betaSM) domains of CoV Nsp3. Nsp3 is a large multi-functional multi-domain protein that is an essential component of the replication/transcription complex (RTC), which carries out RNA synthesis, RNA processing, and interference with the host cell innate immune system. The NAB domain both binds ssRNA and unwinds dsDNA. It prefers to bind ssRNA containing repeats of three consecutive guanines. A group of residues that form a positively charged patch on the protein surface of SARS-CoV Nsp3 NAB serves as the binding site of nucleic acids. This site is conserved in the NAB of Nsp3 from betacoronavirus in the sarbecovirus subgenus (B lineage), but is not conserved in the Nsp3 NAB from betacoronaviruses in the A lineage. Pssm-ID: 409350 Cd Length: 119 Bit Score: 268.17 E-value: 6.69e-83
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| MHV-like_Nsp3_betaSM | cd21812 | betacoronavirus-specific marker of non-structural protein 3 from murine hepatitis virus and ... |
2111-2234 | 2.60e-79 | |||||||||
betacoronavirus-specific marker of non-structural protein 3 from murine hepatitis virus and betacoronavirus in the A lineage; This model represents the betacoronavirus-specific marker (betaSM), also called group 2-specific marker (G2M), of non-structural protein 3 (Nsp3) from betacoronavirus in the embecovirus subgenus (A lineage), including murine hepatitis virus (MHV) and Human coronavirus HKU1. The betaSM/G2M is located C-terminal to the nucleic acid-binding (NAB) domain. This region is absent in alpha- and deltacoronavirus Nsp3; there is a gammacoronavirus-specific marker (gammaSM) at this position in gammacoronavirus Nsp3. Nsp3 is a large multi-functional multi-domain protein that is an essential component of the replication/transcription complex (RTC), which carries out RNA synthesis, RNA processing, and interference with the host cell innate immune system. Little is known about the betaSM/G2M domain; it is predicted to be non-enzymatic and may be an intrinsically disordered region. The betaSM/G2M domain is part of the predicted PLnc domain (made up of 385 amino acids) of the related SARS-CoV Nsp3 that may function as a replication/transcription scaffold, with interactions to Nsp5, Nsp12, Nsp13, Nsp14, and Nsp16. Pssm-ID: 409627 Cd Length: 125 Bit Score: 258.00 E-value: 2.60e-79
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| CoV_NSP10 | pfam09401 | Coronavirus RNA synthesis protein NSP10; Non-structural protein 10 (NSP10) is involved in RNA ... |
4332-4450 | 6.77e-73 | |||||||||
Coronavirus RNA synthesis protein NSP10; Non-structural protein 10 (NSP10) is involved in RNA synthesis. It is synthesized as a polyprotein whose cleavage generates many non-structural proteins. NSP10 contains two zinc binding motifs and forms two anti-parallel helices which are stacked against an irregular beta sheet. A cluster of basic residues on the protein surface suggests a nucleic acid-binding function. NSP10 interacts with NSP14 and NSP16 and regulates their respective ExoN and 2-O-MTase activities. When binding to the N-terminal of NSP14, nsp10 allows the ExoN active site to adopt a stably closed conformation and is an allosteric regulator that stabilizes NSP16. The residue Tyr-96 plays a crucial role in the NSP10-NSP16/NSP14 interaction. This residue is specific for SARS-CoV NSP10 and is a phenylalanine in most other Coronavirus homologs. Pssm-ID: 462788 Cd Length: 119 Bit Score: 239.65 E-value: 6.77e-73
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| betaCoV_Nsp9 | cd21898 | betacoronavirus non-structural protein 9; This model represents the non-structural protein 9 ... |
4211-4320 | 1.68e-69 | |||||||||
betacoronavirus non-structural protein 9; This model represents the non-structural protein 9 (Nsp9) from betacoronaviruses including highly pathogenic Severe acute respiratory syndrome-related coronavirus (SARS-CoV), SARS-CoV2 (also called 2019 novel CoV or 2019-nCoV), and Middle East respiratory syndrome-related (MERS) CoV. CoVs utilize a multi-subunit replication/transcription machinery assembled from a set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins. All of these Nsps, except for Nsp1 and Nsp2, are considered essential for transcription, replication, and translation of the viral RNA. Nsp9, with Nsp7, Nsp8, and Nsp10, localizes within the replication complex. Nsp9 is an essential single-stranded RNA-binding protein for coronavirus replication; it shares structural similarity to the oligosaccharide-binding (OB) fold, which is characteristic of proteins that bind to ssDNA or ssRNA. Nsp9 requires dimerization for binding and orienting RNA for subsequent use by the replicase machinery. CoV Nsp9s have diverse forms of dimerization that promote their biological function, which may help elucidate the mechanism underlying CoVs replication and contribute to the development of antiviral drugs. Generally, dimers are formed via interaction of the parallel alpha-helices containing the protein-protein interaction motif GXXXG; additionally, the N-finger region may also play a critical role in dimerization as seen in porcine delta coronavirus (PDCoV) Nsp9. As a member of the replication complex, Nsp9 may not have a specific RNA-binding sequence but may act in conjunction with other Nsps as a processivity factor, as shown by mutation studies indicating that Nsp9 is a key ingredient that intimately engages other proteins in the replicase complex to mediate efficient virus transcription and replication. Pssm-ID: 409331 Cd Length: 111 Bit Score: 229.59 E-value: 1.68e-69
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| bCoV_NAB | pfam16251 | Betacoronavirus nucleic acid-binding (NAB); This is the nucleic acid-binding domain (NAB) from ... |
1949-2063 | 2.44e-64 | |||||||||
Betacoronavirus nucleic acid-binding (NAB); This is the nucleic acid-binding domain (NAB) from the multidomain nonstructural protein NSP3, and described as NSP3e domain. NSP3 is part of Orf1a polyproteins in SARS-CoV. It is an essential component of the replication/transcription complex. The global domain of the NAB represents a new fold, with a parallel four-strand beta-sheet holding two alpha-helices of three and four turns that are oriented antiparallel to the beta-strands and a group of residues form a positively charged patch on the protein surface as the binding site responsible for binding affinity for nucleic acids. When binding to ssRNA, the NAB prefers sequences with repeats of three consecutive Gs, such as (GGGA)5 and (GGGA)2. A positively charged surface patch (Lys75, Lys76, Lys99, and Arg106) is involved in RNA binding. Pssm-ID: 406621 Cd Length: 129 Bit Score: 215.49 E-value: 2.44e-64
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| CoV_NSP9 | pfam08710 | Coronavirus replicase NSP9; Nsp9 is a single-stranded RNA-binding viral protein involved in ... |
4211-4320 | 4.21e-58 | |||||||||
Coronavirus replicase NSP9; Nsp9 is a single-stranded RNA-binding viral protein involved in RNA synthesis. Several crystallographic structures of nsp9 have shown that it is composed of seven beta strands and a single alpha helix. Nsp9 proteins have N-finger motifs and highly conserved GXXXG motifs that both play critical roles in dimerization. The conserved helix-helix dimer interface containing a GXXXG protein-protein interaction motif is biologically relevant to SARS-CoV replication. Pssm-ID: 285872 Cd Length: 111 Bit Score: 196.93 E-value: 4.21e-58
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| CoV_NSP4_C | pfam16348 | Coronavirus replicase NSP4, C-terminal; This is the C-terminal domain of the coronavirus ... |
3238-3332 | 3.68e-49 | |||||||||
Coronavirus replicase NSP4, C-terminal; This is the C-terminal domain of the coronavirus nonstructural protein 4 (NSP4). NSP4 is encoded by ORF1a/1ab and proteolytically released from the pp1a/1ab polyprotein. It is a membrane-spanning protein which is thought to anchor the viral replication-transcription complex (RTC) to modified endoplasmic reticulum membranes. This predominantly alpha-helical domain may be involved in protein-protein interactions. It has been shown that in Betacoronavirus, the coexpression of NSP3 and NSP4 results in a membrane rearrangement to induce double-membrane vesicles (DMVs) and convoluted membranes (CMs), playing a critical role in SARS-CoV replication. There are two well conserved amino acid residues (H120 and F121) in NSP4 among Betacoronavirus, essential for membrane rearrangements during interaction with NSP3. Pssm-ID: 465099 Cd Length: 92 Bit Score: 170.79 E-value: 3.68e-49
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| DPUP_MHV_Nsp3 | cd21524 | DPUP (domain preceding Ubl2 and PLP2) of non-structural protein 3 (Nsp3) from murine hepatitis ... |
1536-1610 | 3.90e-46 | |||||||||
DPUP (domain preceding Ubl2 and PLP2) of non-structural protein 3 (Nsp3) from murine hepatitis virus and related betacoronaviruses in the A lineage; This subfamily contains the DPUP (domain preceding Ubl2 and PLP2) of murine hepatitis virus (MHV) non-structural protein 3 (Nsp3) and other Nsp3s from betacoronaviruses in the embecovirus subgenera (A lineage), including human CoV OC43, rabbit CoV HKU14 and porcine hemagglutinating encephalomyelitis virus (HEV), among others. Non-structural protein 3 (Nsp3) is a large multi-functional multi-domain protein that is an essential component of the replication/transcription complex (RTC), which carries out RNA synthesis, RNA processing, and interference with the host cell innate immune system. MHV Nsp3 contains a DPUP that is located N-terminal to the ubiquitin-like domain 2 (Ubl2) and papain-like protease 2 (PLP2) catalytic domain. It is structurally similar to the Severe Acute Respiratory Syndrome (SARS) CoV unique domain C (SUD-C), adopting a frataxin-like fold that has structural similarity to DNA-binding domains of DNA-modifying enzymes. SUD-C is also located N-terminal to Ubl2 and PLP2 in SARS Nsp3, similar to the DPUP of MHV Nsp3; however, unlike DPUP, it is preceded by SUD-N and SUD-M macrodomains that are absent in MHV Nsp3. Though structurally similar, there is little sequence similarity between DPUP and SUD-C. SARS SUD-C has been shown to bind to single-stranded RNA and recognize purine bases more strongly than pyrimidine bases; it also regulates the RNA binding behavior of the SARS SUD-M macrodomain. It is not known whether DPUP functions in the same way. Pssm-ID: 394840 Cd Length: 75 Bit Score: 161.43 E-value: 3.90e-46
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| CoV_peptidase | pfam08715 | Coronavirus papain-like peptidase; This entry contains coronavirus cysteine endopeptidases ... |
1610-1917 | 6.92e-38 | |||||||||
Coronavirus papain-like peptidase; This entry contains coronavirus cysteine endopeptidases that belong to MEROPS peptidase family C16 and are required for proteolytic processing of the replicase polyprotein. All coronaviruses encode between one and two accessory cysteine proteinases that recognize and process one or two sites in the amino-terminal half of the replicase polyprotein during assembly of the viral replication complex. HCoV and TGEV encode two accessory proteinases, called coronavirus papain-like proteinase 1 and 2 (PL1-PRO and PL2-PRO). IBV and SARS encodes only one called PL-PRO. The structure of this protein has shown it adopts a fold similar that of de-ubiquitinating enzymes. The peptidase family C16 domain is about 260 amino acids in length. This domain is predicted to have an alpha-beta structural organization known as the papain-like fold. It consists of three alpha-helices and three strands of antiparallel beta-sheet. Pssm-ID: 430171 Cd Length: 318 Bit Score: 146.67 E-value: 6.92e-38
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| betaCoV_Nsp7 | cd21827 | betacoronavirus non-structural protein 7; This model represents the non-structural protein 7 ... |
3925-4013 | 1.22e-36 | |||||||||
betacoronavirus non-structural protein 7; This model represents the non-structural protein 7 (Nsp7) of betacoronaviruses including the highly pathogenic Severe acute respiratory syndrome-related coronavirus (SARS-CoV), SARS-CoV2 (also called 2019 novel CoV or 2019-nCoV), and Middle East respiratory syndrome-related (MERS) CoV. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. Upon processing of the Nsp7-10 region by protease M (Mpro), the released four small proteins Nsp7, Nsp8, Nsp9 and Nsp10 form functional complexes with CoV core enzymes and stimulate replication. Most importantly, a complex of Nsp7 with Nsp8 has been shown to activate and confer processivity to the RNA-synthesizing activity of Nsp12, the RNA-dependent RNA-polymerase (RdRp); in SARS-CoV, point mutations in the NSP7- or NSP8-coding region have been shown to delay virus growth. Nsp7 and Nsp8 cooperate in activating the primer-dependent activity of the Nsp12 RdRp such that the level of their association may constitute a limiting factor for obtaining a high RNA polymerase activity. The subsequent Nsp7/Nsp8/Nsp12 polymerase complex is then able to associate with an active bifunctional Nsp14, which includes N-terminal 3' to 5' exoribonuclease (ExoN) and C-terminal N7-guanine cap methyltransferase (N7-MTase) activities, thus representing a unique coronavirus Nsp assembly that incorporates RdRp, exoribonuclease, and N7-MTase activities. Interaction of Nsp7 with Nsp8 appears to be conserved across the coronavirus family, making these proteins interesting drug targets. Nsp7 has a 4-helical bundle conformation which is strongly affected by its interaction with Nsp8, especially where it concerns alpha-helix 4. SARS-CoV Nsp7 forms a 8:8 hexadecameric supercomplex with Nsp8 that adopts a hollow cylinder-like structure with a large central channel and positive electrostatic properties in the cylinder; the Nsp7/Nsp8 complex functions as a noncanonical RNA polymerase capable of synthesizing RNA of up to template length. Pssm-ID: 409253 Cd Length: 83 Bit Score: 134.49 E-value: 1.22e-36
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| CoV_NSP7 | pfam08716 | Coronavirus replicase NSP7; NSP7 (non structural protein 7) has been implicated in viral RNA ... |
3925-4013 | 1.43e-36 | |||||||||
Coronavirus replicase NSP7; NSP7 (non structural protein 7) has been implicated in viral RNA replication and is predominantly alpha helical in structure. It forms a hexadecameric supercomplex with NSP8 that adopts a hollow cylinder-like structure. The dimensions of the central channel and positive electrostatic properties of the cylinder imply that it confers processivity on RNA-dependent RNA polymerase. NSP7 and NSP8 heterodimers play a role in the stabilization of NSP12 regions involved in RNA binding and are essential for a highly active NSP12 polymerase complex. Pssm-ID: 285878 Cd Length: 83 Bit Score: 134.50 E-value: 1.43e-36
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| Ubl1_cv_Nsp3_N-like | cd21467 | first ubiquitin-like (Ubl) domain located at the N-terminus of coronavirus SARS-CoV ... |
852-941 | 4.99e-36 | |||||||||
first ubiquitin-like (Ubl) domain located at the N-terminus of coronavirus SARS-CoV non-structural protein 3 (Nsp3) and related proteins; This ubiquitin-like (Ubl) domain (Ubl1) is found at the N-terminus of coronavirus Nsp3, a large multi-functional multi-domain protein which is an essential component of the replication/transcription complex (RTC). The functions of Ubl1 in CoVs are related to single-stranded RNA (ssRNA) binding and to interacting with the nucleocapsid (N) protein. SARS-CoV Ubl1 has been shown to bind ssRNA having AUA patterns, and since the 5'-UTR of the SARS-CoV genome has a number of AUA repeats, it may bind there. In mouse hepatitis virus (MHV), this Ubl1 domain binds the cognate N protein. Adjacent to Ubl1 is a Glu-rich acidic region (also referred to as hypervariable region, HVR); Ubl1 together with HVR has been called Nsp3a. Currently, the function of HVR in CoVs is unknown. This model corresponds to one of two Ubl domains in Nsp3; the other is located N-terminal to the papain-like protease (PLpro) and is not represented by this model. Pssm-ID: 394822 Cd Length: 89 Bit Score: 133.08 E-value: 4.99e-36
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| Macro_X_Nsp3-like | cd21557 | X-domain (or Mac1 domain) of viral non-structural protein 3 and related macrodomains; The ... |
1343-1467 | 5.91e-23 | |||||||||
X-domain (or Mac1 domain) of viral non-structural protein 3 and related macrodomains; The X-domain, also called Mac1, is the macrodomain found in riboviral non-structural protein 3 (Nsp3), including the Nsp3 of Severe Acute Respiratory Syndrome Coronavirus (SARS-CoV) as well as SARS-CoV-2, and other coronaviruses (alpha-, beta-, gamma-, and deltacoronavirus), among others. The SARS-CoV-2 Nsp3 Mac1 is highly conserved among all CoVs, and binds to and hydrolyzes mono-ADP-ribose (MAR) from target proteins. It appears to counter host-mediated antiviral ADP-ribosylation, a post-translational modification that is part of the host response to viral infections. Mac1 is essential for pathogenesis in multiple animal models of CoV infection, implicating it as a virulence factor and potential therapeutic target. Assays show that the de-MARylating activity leads to a rapid loss of substrate, and that Mac1 could not hydrolyze poly-ADP-ribose; thus, Mac1 is a MAR-hydrolase (mono-ADP ribosylhydrolase). Mac1 was originally named ADP-ribose-1"-phosphatase (ADRP) based on data demonstrating that it could remove the phosphate group from ADP-ribose-1"-phosphate; however, activity was modest and was unclear why this would impact a virus infection. This family also includes the X-domain of Avian infectious bronchitis virus (IBV) strain Beaudette coronavirus that does not bind ADP-ribose; the triple glycine sequence found in the X-domains of SARS-CoV and human coronavirus 229E (HCoV229E), which are involved in ADP-ribose binding, is not conserved in the IBV X-domain. SARS-CoVs have two other macrodomains referred to as the SUD-N (N-terminal subdomain, or Mac2) and SUD-M (middle SUD subdomain, or Mac3) of the SARS-unique domain (SUD), which also do not bind ADP-ribose; these bind G-quadruplexes (unusual nucleic-acid structures formed by consecutive guanosine nucleotides). SARS-CoV SUD-N and SUD-M are not included in this group. Pssm-ID: 438957 Cd Length: 127 Bit Score: 97.24 E-value: 5.91e-23
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| CoV_NSP2_C | pfam19212 | Coronavirus replicase NSP2, C-terminal; This entry corresponds to a presumed domain found at ... |
671-832 | 5.01e-21 | |||||||||
Coronavirus replicase NSP2, C-terminal; This entry corresponds to a presumed domain found at the C-terminus of Coronavirus non-structural protein 2 (NSP2). NSP2 is encoded by ORF1a/1ab and proteolytically released from the pp1a/1ab polyprotein. The function of NSP2 is uncertain. This presumed domain is found in two copies in some viral NSP2 proteins. This domain is found in both alpha and betacoronaviruses. Pssm-ID: 465996 Cd Length: 156 Bit Score: 92.71 E-value: 5.01e-21
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| B-CoV_A_NSP1 | pfam11963 | Betacoronavirus, lineage A, NSP1; This family the N-terminal region of the Betacoronavirus ... |
969-1077 | 1.58e-20 | |||||||||
Betacoronavirus, lineage A, NSP1; This family the N-terminal region of the Betacoronavirus polyprotein which contains non-structural protein 1 (Nsp1) from Betacoronavirus lineage A. This protein is important for viral replication and pathogenesis. It suppresses the host innate immune functions by inhibiting type I interferon expression and host antiviral signalling pathways. Pssm-ID: 152398 Cd Length: 355 Bit Score: 96.55 E-value: 1.58e-20
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| A1pp | smart00506 | Appr-1"-p processing enzyme; Function determined by Martzen et al. Extended family detected by ... |
1325-1455 | 1.30e-17 | |||||||||
Appr-1"-p processing enzyme; Function determined by Martzen et al. Extended family detected by reciprocal PSI-BLAST searches (unpublished results, and Pehrson _ Fuji). Pssm-ID: 214701 Cd Length: 133 Bit Score: 81.97 E-value: 1.30e-17
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| Macro | pfam01661 | Macro domain; The Macro or A1pp domain is a module of about 180 amino acids which can bind ... |
1346-1449 | 2.49e-10 | |||||||||
Macro domain; The Macro or A1pp domain is a module of about 180 amino acids which can bind ADP-ribose (an NAD metabolite) or related ligands. Binding to ADP-ribose could be either covalent or non-covalent: in certain cases it is believed to bind non-covalently; while in other cases (such as Aprataxin) it appears to bind both non-covalently through a zinc finger motif, and covalently through a separate region of the protein. This domain is found in a number of otherwise unrelated proteins. It is found at the C-terminus of the macro-H2A histone protein 4 and also in the non-structural proteins of several types of ssRNA viruses such as NSP3 from alpha-viruses and coronaviruses. This domain is also found on its own in a family of proteins from bacteria, archaebacteria and eukaryotes. The 3D structure of the SARS-CoV Macro domain has a mixed alpha/beta fold consisting of a central seven-stranded twisted mixed beta sheet sandwiched between two alpha helices on one face, and three on the other. The final alpha-helix, located on the edge of the central beta-sheet, forms the C terminus of the protein. The crystal structure of AF1521 (a Macro domain-only protein from Archaeoglobus fulgidus) has also been reported and compared with other Macro domain containing proteins. Several Macro domain only proteins are shorter than AF1521, and appear to lack either the first strand of the beta-sheet or the C-terminal helix 5. Well conserved residues form a hydrophobic cleft and cluster around the AF1521-ADP-ribose binding site. Pssm-ID: 460286 Cd Length: 116 Bit Score: 60.66 E-value: 2.49e-10
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| YmdB | COG2110 | O-acetyl-ADP-ribose deacetylase (regulator of RNase III), contains Macro domain [Translation, ... |
1326-1478 | 8.12e-06 | |||||||||
O-acetyl-ADP-ribose deacetylase (regulator of RNase III), contains Macro domain [Translation, ribosomal structure and biogenesis]; Pssm-ID: 441713 Cd Length: 168 Bit Score: 49.02 E-value: 8.12e-06
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| Name | Accession | Description | Interval | E-value | |||||||||
| TM_Y_MHV-like_Nsp3_C | cd21714 | C-terminus of non-structural protein 3, including transmembrane and Y domains, from murine ... |
2283-2837 | 0e+00 | |||||||||
C-terminus of non-structural protein 3, including transmembrane and Y domains, from murine hepatitis virus and betacoronavirus in the A lineage; This model represents the C-terminus of non-structural protein 3 (Nsp3) from betacoronavirus in the embecovirus subgenus (A lineage), including murine hepatitis virus (MHV) and Human coronavirus HKU1. This conserved C-terminus includes two transmembrane (TM) regions TM1 and TM2, an ectodomain (3Ecto) between the TM1 and TM2 that is glycosylated and located on the lumenal side of the ER, an amphiphatic region (AH1) that is not membrane-spanning, and a large Y domain of approximately 370 residues. Nsp3 is a large multi-functional multi-domain protein that is an essential component of the replication/transcription complex (RTC), which carries out RNA synthesis, RNA processing, and interference with the host cell innate immune system. In MHV and the related Severe acute respiratory syndrome-related coronavirus (SARS-CoV), the TM1, 3Ecto and TM2 domains are important for the papain-like protease (PL2pro) domain to process Nsp3-Nsp4 cleavage. It has also been shown that the interaction of 3Ecto with the lumenal loop of Nsp4 is essential for ER rearrangements in cells infected with SARS-CoV or MHV. The Y domain, located at the cytosolic side of the ER, consists of the Y1 and CoV-Y subdomains, which are conserved in nidovirus and coronavirus, respectively. Functional information about the Y domain is limited; it has been shown that Nsp3 binding to Nsp4 is less efficient without the Y domain. Pssm-ID: 409662 Cd Length: 555 Bit Score: 1095.19 E-value: 0e+00
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| betaCoV_Nsp2_MHV-like | cd21519 | betacoronavirus non-structural protein 2 (Nsp2) similar to MHV Nsp2/p65 and related proteins ... |
250-832 | 0e+00 | |||||||||
betacoronavirus non-structural protein 2 (Nsp2) similar to MHV Nsp2/p65 and related proteins from betacoronaviruses in the A lineage; Coronavirus non-structural proteins (Nsps) are encoded in ORF1a and ORF1b. Post infection, the genomic RNA is released into the cytoplasm of the cell and translated into two long polyproteins (pp), pp1a and pp1ab, which are then autoproteolytically cleaved by two viral proteases Nsp3 and Nsp5 into smaller subunits. Nsp2 is one of these subunits. This subgroup includes Nsp2 from Murine hepatitis virus (MHV) and betacoronaviruses in the embecovirus subgenus (A lineage). It belongs to a family which includes Severe acute respiratory syndrome coronavirus (SARS-CoV) Nsp2. The function of Nsp2 remains unclear. SARS-CoV Nsp2, rather than playing a role in viral replication, may be involved in altering the host cell environment; deletion of Nsp2 from the SARS-CoV genome results in only a modest reduction in viral titers, and it has been shown to interact with two host proteins, prohibitin 1 (PHB1) and PHB2 which have been implicated in cellular functions, including cell-cycle progression, cell migration, cellular differentiation, apoptosis, and mitochondrial biogenesis. MHV Nsp2, also known as p65, different from SARS-CoV Nsp2, may play an important role in the viral life cycle. Pssm-ID: 394870 Cd Length: 586 Bit Score: 1072.77 E-value: 0e+00
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| TM_Y_betaCoV_Nsp3_C | cd21713 | C-terminus of betacoronavirus non-structural protein 3, including transmembrane and Y domains; ... |
2283-2837 | 0e+00 | |||||||||
C-terminus of betacoronavirus non-structural protein 3, including transmembrane and Y domains; This model represents the C-terminus of non-structural protein 3 (Nsp3) from betacoronavirus, including highly pathogenic betacoronaviruses such as Severe acute respiratory syndrome-related coronavirus (SARS-CoV), SARS-CoV2 (also called 2019 novel CoV or 2019-nCoV), and Middle East respiratory syndrome-related (MERS) CoV. This conserved C-terminus includes two transmembrane (TM) regions TM1 and TM2, an ectodomain (3Ecto) between the TM1 and TM2 that is glycosylated and located on the lumenal side of the ER, an amphiphatic region (AH1) that is not membrane-spanning, and a large Y domain of approximately 370 residues. Nsp3 is a large multi-functional multi-domain protein that is an essential component of the replication/transcription complex (RTC), which carries out RNA synthesis, RNA processing, and interference with the host cell innate immune system. In SARS-CoV and murine hepatitis virus (MHV), the TM1, 3Ecto and TM2 domains are important for the papain-like protease (PL2pro) domain to process Nsp3-Nsp4 cleavage. It has also been shown that the interaction of 3Ecto with the lumenal loop of Nsp4 is essential for ER rearrangements in cells infected with SARS-CoV or MHV. The Y domain, located at the cytosolic side of the ER, consists of the Y1 and CoV-Y subdomains, which are conserved in nidovirus and coronavirus, respectively. Functional information about the Y domain is limited; it has been shown that Nsp3 binding to Nsp4 is less efficient without the Y domain. Pssm-ID: 409661 Cd Length: 545 Bit Score: 812.11 E-value: 0e+00
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| B-CoV_A_NSP1 | pfam11963 | Betacoronavirus, lineage A, NSP1; This family the N-terminal region of the Betacoronavirus ... |
1-355 | 0e+00 | |||||||||
Betacoronavirus, lineage A, NSP1; This family the N-terminal region of the Betacoronavirus polyprotein which contains non-structural protein 1 (Nsp1) from Betacoronavirus lineage A. This protein is important for viral replication and pathogenesis. It suppresses the host innate immune functions by inhibiting type I interferon expression and host antiviral signalling pathways. Pssm-ID: 152398 Cd Length: 355 Bit Score: 678.97 E-value: 0e+00
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| betaCoV_Nsp5_Mpro | cd21666 | betacoronavirus non-structural protein 5, also called Main protease (Mpro); This subfamily ... |
3338-3631 | 0e+00 | |||||||||
betacoronavirus non-structural protein 5, also called Main protease (Mpro); This subfamily contains the coronavirus (CoV) non-structural protein 5 (Nsp5) also called the Main protease (Mpro), or 3C-like protease (3CLpro), found in betacoronaviruses. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. Mpro/Nsp5 is a key enzyme in this process, making it a high value target for the development of anti-coronavirus therapeutics. These enzymes belong to the MEROPS peptidase C30 family, where the active site residues His and Cys form a catalytic dyad. The structures of Mpro/Nsp5 consist of three domains with the first two containing anti-parallel beta barrels and the third consisting of an arrangement of alpha-helices. The catalytic residues are found in a cleft between the first two domains. Mpro requires a Gln residue in the P1 position of the substrate and space for only small amino-acid residues such as Gly, Ala, or Ser in the P1' position; since there is no known human protease with a specificity for Gln at the cleavage site of the substrate, these viral proteases are suitable targets for the development of antiviral drugs. Pssm-ID: 394887 Cd Length: 297 Bit Score: 577.82 E-value: 0e+00
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| Peptidase_C30 | pfam05409 | Coronavirus endopeptidase C30; This Coronavirus (CoV) domain, peptidase C30, is also known as ... |
3363-3637 | 3.40e-168 | |||||||||
Coronavirus endopeptidase C30; This Coronavirus (CoV) domain, peptidase C30, is also known as 3C-like proteinase (3CL-pro), or CoV main protease (M-pro) domain. CoV M-pro is a dimer where each subunit is composed of three domains I, II and III,,. Domains I and II consist of six-stranded antiparallel beta barrels and together resemble the architecture of chymotrypsin, and of picornaviruses 3C proteinases. The substrate-binding site is located in a cleft between these two domains. The catalytic site is situated at the centre of the cleft. A long loop connects domain II to the C-terminal domain (domain III). This latter domain has been implicated in the proteolytic activity of M-pro. In the active site of M-pro, Cys and His form a catalytic dyad,. Pssm-ID: 398852 Cd Length: 274 Bit Score: 519.31 E-value: 3.40e-168
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| cv_Nsp4_TM | cd21473 | coronavirus non-structural protein 4 (Nsp4) transmembrane domain; Nsp4 may be involved in ... |
2849-3231 | 8.99e-164 | |||||||||
coronavirus non-structural protein 4 (Nsp4) transmembrane domain; Nsp4 may be involved in coronavirus-induced membrane remodeling. In order to assemble the replication-transcription complex (RTC), coronavirus induces the rearrangement of host endoplasmic reticulum (ER) membrane into double membrane vesicles (DMVs), zippered ER, or ER spherules. DMV formation has been observed in SARS-CoV cells overexpressing the three transmembrane-containing non-structural proteins of viral replicase polyprotein 1ab: Nsp3, Nsp4 and Nsp6. Together, Nsp3, Nsp4, and Nsp6 have the ability to induce the formation of DMVs that are similar to those seen in SARS-CoV-infected cells. Pssm-ID: 394836 Cd Length: 376 Bit Score: 511.37 E-value: 8.99e-164
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| betaCoV_PLPro | cd21732 | betacoronavirus papain-like protease; This model represents the papain-like protease (PLPro) ... |
1611-1908 | 7.98e-161 | |||||||||
betacoronavirus papain-like protease; This model represents the papain-like protease (PLPro) found in non-structural protein 3 (Nsp3) of betacoronavirus, including highly pathogenic betacoronaviruses such as Severe acute respiratory syndrome-related coronavirus (SARS-CoV), SARS-CoV2 (also called 2019 novel CoV or 2019-nCoV), and Middle East respiratory syndrome-related (MERS) CoV. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. PLPro is a key enzyme in this process, making it a high value target for the development of anti-coronavirus therapeutics. PLPro, which belongs to the MEROPS peptidase C16 family, participates in the proteolytic processing of the N-terminal region of the replicase polyprotein; it can cleave Nsp1|Nsp2, Nsp2|Nsp3, and Nsp3|Nsp4 sites and its activity is dependent on zinc. In SARS-CoV and murine hepatitis virus (MHV), the C-terminal non-structural protein 3 region spanning transmembrane regions TM1 and TM2 with 3Ecto domain in between, are important for the PL2pro domain to process Nsp3-Nsp4 cleavage. Besides cleaving the polyproteins, PLPro also possesses a related enzymatic activity to promote virus replication: deubiquitinating (DUB) and de-ISGylating activities. Both, ubiquitin (Ub) and Ub-like interferon-stimulated gene product 15 (ISG15), are involved in preventing viral infection; coronaviruses utilize Ubl-conjugating pathways to counter the pro-inflammatory properties of Ubl-conjugated host proteins via the action of PLPro, which processes both 'Lys-48'- and 'Lys-63'-linked polyubiquitin chains from cellular substrates. The Nsp3 PLPro domain of many of these CoVs has also been shown to antagonize host innate immune induction of type I interferon by interacting with IRF3 and blocking its activation. Interactions of SARS-CoV and MERS-CoV with antiviral interferon (IFN) responses of human cells are remarkably different; high-dose IFN treatment (type I and type III) shows MERS-CoV was substantially more IFN sensitive than SARS-CoV. This may be due to differences in the architecture of the oxyanion hole and of the S3 as well as the S5 specificity sites, despite the overall structures of SARS-CoV and MERS-CoV PLPro being similar. Pssm-ID: 409649 Cd Length: 304 Bit Score: 499.81 E-value: 7.98e-161
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| CoV_Nsp5_Mpro | cd21646 | coronavirus non-structural protein 5, also called Main protease (Mpro); This family contains ... |
3338-3630 | 1.09e-160 | |||||||||
coronavirus non-structural protein 5, also called Main protease (Mpro); This family contains the coronavirus (CoV) non-structural protein 5 (Nsp5) also called the Main protease (Mpro), or 3C-like protease (3CLpro). CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. Mpro/Nsp5 is a key enzyme in this process, making it a high value target for the development of anti-coronavirus therapeutics. These enzymes belong to the MEROPS peptidase C30 family, where the active site residues His and Cys form a catalytic dyad. The structures of Mpro/Nsp5 consist of three domains with the first two containing anti-parallel beta barrels and the third consisting of an arrangement of alpha-helices. The catalytic residues are found in a cleft between the first two domains. Mpro/Nsp5 requires a Gln residue in the P1 position of the substrate and space for only small amino-acid residues such as Gly, Ala, or Ser in the P1' position; since there is no known human protease with a specificity for Gln at the cleavage site of the substrate, these viral proteases are suitable targets for the development of antiviral drugs. Pssm-ID: 394885 Cd Length: 292 Bit Score: 498.87 E-value: 1.09e-160
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| MHV-like_Nsp1 | cd21879 | non-structural protein 1 from murine hepatitis virus and betacoronavirus in the A lineage; ... |
6-242 | 2.13e-150 | |||||||||
non-structural protein 1 from murine hepatitis virus and betacoronavirus in the A lineage; This model represents the non-structural protein 1 (Nsp1) from betacoronavirus in the embecovirus subgenus (A lineage), including murine hepatitis virus (MHV), bovine coronavirus (BCoV) and Human coronavirus HKU1. CoVs utilize a multi-subunit replication/transcription machinery assembled from a set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins. Nsp1 is the N-terminal cleavage product released from the ORF1a polyprotein by the action of papain-like protease (PLpro). Though Nsp1s of alphaCoVs and betaCoVs share structural similarity, they show no significant sequence similarity and may be considered as genus-specific markers. Despite low sequence similarity, the Nsp1s of alphaCoVs and betaCoVs exhibit remarkably similar biological functions, and are involved in the regulation of both host and viral gene expression. CoV Nsp1 induces suppression of host gene expression and interferes with host immune response. It inhibits host gene expression in two ways: by targeting the translation and stability of cellular mRNAs, and by inhibiting mRNA translation and inducing an endonucleolytic RNA cleavage in the 5'-UTR of cellular mRNAs through its tight association with the 40S ribosomal subunit, a key component of the cellular translation machinery. Inhibition of host mRNA translation includes that of type I interferons, major components of the host innate immune response. Nsp1 is critical in regulating viral replication and gene expression, as shown by multiple evidences, including: mutations in the Nsp1 coding region of the transmissible gastroenteritis virus (TGEV) and MHV genomes cause drastic reduction or elimination of infectious virus; BCoV Nsp1 is an RNA-binding protein that interacts with cis-acting replication elements in the 5'-UTR of the BCoV genome, implying its potential role in the regulation of viral translation or replication; and SARS-CoV Nsp1 enhances virus replication by binding to a stem-loop structure in the 5'-UTR of its genome. Pssm-ID: 409341 Cd Length: 236 Bit Score: 466.86 E-value: 2.13e-150
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| betaCoV-Nsp6 | cd21560 | betacoronavirus non-structural protein 6; Coronaviruses (CoV) redirect and rearrange host cell ... |
3638-3924 | 2.53e-150 | |||||||||
betacoronavirus non-structural protein 6; Coronaviruses (CoV) redirect and rearrange host cell membranes as part of the viral genome replication and transcription machinery; they induce the formation of double-membrane vesicles in infected cells. CoV non-structural protein 6 (Nsp6), a transmembrane-containing protein, together with Nsp3 and Nsp4, have the ability to induce double-membrane vesicles that are similar to those observed in severe acute respiratory syndrome (SARS) coronavirus-infected cells. By itself, Nsp6 can generate autophagosomes from the endoplasmic reticulum. Autophagosomes are normally generated as a cellular response to starvation to carry cellular organelles and long-lived proteins to lysosomes for degradation. Degradation through autophagy may provide an innate defense against virus infection, or conversely, autophagosomes can promote infection by facilitating the assembly of replicase proteins. In addition to initiating autophagosome formation, Nsp6 also limits autophagosome expansion regardless of how they were induced, i.e. whether they were induced directly by Nsp6, or indirectly by starvation or chemical inhibition of MTOR signaling. This may favor coronavirus infection by compromising the ability of autophagosomes to deliver viral components to lysosomes for degradation. Pssm-ID: 394846 Cd Length: 290 Bit Score: 469.03 E-value: 2.53e-150
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| CoV_NSP3_C | pfam19218 | Coronavirus replicase NSP3, C-terminal; This family represents the C-terminal region of ... |
2337-2824 | 3.72e-144 | |||||||||
Coronavirus replicase NSP3, C-terminal; This family represents the C-terminal region of non-structural protein NSP3 (also known as nsp3). NSP3 is the product of ORF1a. It is found in human SARS coronavirus polyprotein 1a and 1ab, and in related coronavirus polyproteins. It is a multifunctional protein comprising up to 16 different domains and regions. NSP3 binds to viral RNA, nucleocapsid protein, as well as other viral proteins and participates in polyprotein processing. Pssm-ID: 466002 Cd Length: 463 Bit Score: 458.72 E-value: 3.72e-144
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| CoV_NSP4_N | pfam19217 | Coronavirus replicase NSP4, N-terminal; This is the N-terminal domain of the coronavirus ... |
2860-3216 | 4.26e-140 | |||||||||
Coronavirus replicase NSP4, N-terminal; This is the N-terminal domain of the coronavirus nonstructural protein 4 (NSP4). NSP4 is encoded by ORF1a/1ab and proteolytically released from the pp1a/1ab polyprotein. NSP4 is a membrane-spanning protein which is thought to anchor the viral replication-transcription complex to modified endoplasmic reticulum membranes. This N-terminal region represents the membrane spanning region, covering four transmembrane regions. Pssm-ID: 466001 Cd Length: 351 Bit Score: 442.48 E-value: 4.26e-140
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| betaCoV_Nsp2_SARS_MHV-like | cd21515 | betacoronavirus non-structural protein 2 (Nsp2), similar to SARS-CoV Nsp2 and MHV Nsp2 (p65), ... |
251-832 | 1.01e-130 | |||||||||
betacoronavirus non-structural protein 2 (Nsp2), similar to SARS-CoV Nsp2 and MHV Nsp2 (p65), and related proteins; Coronavirus non-structural proteins (Nsps) are encoded in ORF1a and ORF1b. Post infection, the genomic RNA is released into the cytoplasm of the cell and translated into two long polyproteins (pp), pp1a and pp1ab, which are then autoproteolytically cleaved by two viral proteases Nsp3 and Nsp5 into smaller subunits. Nsp2 is one of these subunits. This family includes Severe acute respiratory syndrome coronavirus (SARS-CoV) Nsp2, SARS-CoV-2 Nsp2, and Murine hepatitis virus (MHV) Nsp2 (also known as p65). The function of Nsp2 remains unclear. SARS-CoV Nsp2 rather than playing a role in viral replication, may be involved in altering the host cell environment; deletion of Nsp2 from the SARS-CoV genome results in only a modest reduction in viral titers. It has been shown to interact with two host proteins, prohibitin 1 (PHB1) and PHB2 which have been implicated in cellular functions, including cell-cycle progression, cell migration, cellular differentiation, apoptosis, and mitochondrial biogenesis. MHV Nsp2/p65, different from SARS-CoV Nsp2, may play an important role in the viral life cycle. Pssm-ID: 439198 Cd Length: 562 Bit Score: 424.18 E-value: 1.01e-130
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| Peptidase_C16 | pfam01831 | Peptidase C16 family; |
1-249 | 3.07e-130 | |||||||||
Peptidase C16 family; Pssm-ID: 460353 Cd Length: 249 Bit Score: 409.47 E-value: 3.07e-130
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| Peptidase_C16 | pfam01831 | Peptidase C16 family; |
1086-1334 | 1.93e-129 | |||||||||
Peptidase C16 family; Pssm-ID: 460353 Cd Length: 249 Bit Score: 407.16 E-value: 1.93e-129
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| CoV_PLPro | cd21688 | Coronavirus (CoV) papain-like protease (PLPro); This model represents the papain-like protease ... |
1611-1908 | 4.03e-123 | |||||||||
Coronavirus (CoV) papain-like protease (PLPro); This model represents the papain-like protease (PLPro) found in non-structural protein 3 (Nsp3) of alpha-, beta-, gamma-, and deltacoronavirus, including highly pathogenic betacoronaviruses such as Severe acute respiratory syndrome-related coronavirus (SARS-CoV), SARS-CoV2 (also called 2019 novel CoV or 2019-nCoV), and Middle East respiratory syndrome-related (MERS) CoV. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. PLPro is a key enzyme in this process, making it a high value target for the development of anti-coronavirus therapeutics. PLPro, which belongs to the MEROPS peptidase C16 family, participates in the proteolytic processing of the N-terminal region of the replicase polyprotein; it can cleave Nsp1|Nsp2, Nsp2|Nsp3, and Nsp3|Nsp4 sites and its activity is dependent on zinc. Besides cleaving the polyproteins, PLPro also possesses a related enzymatic activity to promote virus replication: deubiquitinating (DUB) and de-ISGylating activities. Both, ubiquitin (Ub) and Ub-like interferon-stimulated gene product 15 (ISG15), are involved in preventing viral infection; coronaviruses utilize Ubl-conjugating pathways to counter the pro-inflammatory properties of Ubl-conjugated host proteins via the action of PLPro, which processes both 'Lys-48'- and 'Lys-63'-linked polyubiquitin chains from cellular substrates. The Nsp3 PLPro domain in many of these CoVs has also been shown to antagonize host innate immune induction of type I interferon by interacting with IRF3 and blocking its activation. Pssm-ID: 409647 Cd Length: 299 Bit Score: 391.46 E-value: 4.03e-123
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| alphaCoV_Nsp5_Mpro | cd21665 | alphacoronavirus non-structural protein 5, also called Main protease (Mpro); This subfamily ... |
3339-3633 | 1.59e-117 | |||||||||
alphacoronavirus non-structural protein 5, also called Main protease (Mpro); This subfamily contains the coronavirus (CoV) non-structural protein 5 (Nsp5) also called the Main protease (Mpro), or 3C-like protease (3CLpro), found in alphacoronaviruses. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. Mpro/Nsp5 is a key enzyme in this process, making it a high value target for the development of anti-coronavirus therapeutics. These enzymes belong to the MEROPS peptidase C30 family, where the active site residues His and Cys form a catalytic dyad. The structures of Mpro/Nsp5 consist of three domains with the first two containing anti-parallel beta barrels and the third consisting of an arrangement of alpha-helices. The catalytic residues are found in a cleft between the first two domains. Mpro/Nsp5 requires a Gln residue in the P1 position of the substrate and space for only small amino-acid residues such as Gly, Ala, or Ser in the P1' position; since there is no known human protease with a specificity for Gln at the cleavage site of the substrate, these viral proteases are suitable targets for the development of antiviral drugs. Pssm-ID: 394886 Cd Length: 296 Bit Score: 375.09 E-value: 1.59e-117
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| betaCoV_Nsp8 | cd21831 | betacoronavirus non-structural protein 8; This model represents the non-structural protein 8 ... |
4017-4210 | 1.58e-116 | |||||||||
betacoronavirus non-structural protein 8; This model represents the non-structural protein 8 (Nsp8) the highly pathogenic betacoronaviruses that include Severe acute respiratory syndrome-related coronavirus (SARS-CoV), SARS-CoV2 (also called 2019 novel CoV or 2019-nCoV), and Middle East respiratory syndrome-related (MERS) CoV. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. Upon processing of the Nsp7-10 region by protease M (Mpro), the released four small proteins Nsp7, Nsp8, Nsp9, and Nsp10 form functional complexes with CoV core enzymes and thereby stimulate replication. Most importantly, a complex of Nsp8 with Nsp7 has been shown to activate and confer processivity to the RNA-synthesizing activity of Nsp12, the RNA-dependent RNA-polymerase (RdRp); in SARS-CoV, point mutations in the genes encoding Nsp8 and Nsp7 have been shown to delay virus growth. Nsp8 and Nsp7 cooperate in activating the primer-dependent activity of the Nsp12 RdRp such that the level of their association may constitute a limiting factor for obtaining a high RNA polymerase activity. The subsequent Nsp7/Nsp8/Nsp12 polymerase complex is then able to associate with an active bifunctional Nsp14, which includes N-terminal 3' to 5' exoribonuclease (ExoN) and C-terminal N7-guanine cap methyltransferase (N7-MTase) activities, thus representing a unique coronavirus Nsp assembly that incorporates RdRp, exoribonuclease, and N7-MTase activities. Interaction of Nsp8 with Nsp7 appears to be conserved across the coronavirus family, making these proteins interesting drug targets. Nsp8 has a novel 'golf-club' fold composed of an N-terminal 'shaft' domain and a C-terminal 'head' domain. The shaft domain contains three helices, one of which is very long, while the head domain contains another three helices and seven beta-strands, forming an alpha/beta fold. SARS-CoV Nsp8 forms a 8:8 hexadecameric supercomplex with Nsp7 that adopts a hollow cylinder-like structure with a large central channel and positive electrostatic properties in the cylinder; the Nsp7/Nsp8 complex functions as a noncanonical RNA polymerase capable of synthesizing RNA of up to the template length. Pssm-ID: 409258 Cd Length: 196 Bit Score: 367.96 E-value: 1.58e-116
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| TM_Y_SARS-CoV-like_Nsp3_C | cd21717 | C-terminus of non-structural protein 3, including transmembrane and Y domains, from Severe ... |
2331-2837 | 4.84e-107 | |||||||||
C-terminus of non-structural protein 3, including transmembrane and Y domains, from Severe acute respiratory syndrome-related coronavirus and betacoronavirus in the B lineage; This model represents the C-terminus of non-structural protein 3 (Nsp3) from betacoronavirus in the sarbecovirus subgenus (B lineage), including highly pathogenic human coronaviruses such as Severe acute respiratory syndrome-related coronavirus (SARS-CoV) and SARS-CoV2 (also called 2019 novel CoV or 2019-nCoV). This conserved C-terminus includes two transmembrane (TM) regions TM1 and TM2, an ectodomain (3Ecto) between the TM1 and TM2 that is glycosylated and located on the lumenal side of the ER, an amphiphatic region (AH1) that is not membrane-spanning, and a large Y domain of approximately 370 residues. Nsp3 is a large multi-functional multi-domain protein that is an essential component of the replication/transcription complex (RTC), which carries out RNA synthesis, RNA processing, and interference with the host cell innate immune system. In SARS-CoV and the related murine hepatitis virus (MHV), the TM1, 3Ecto and TM2 domains are important for the papain-like protease (PL2pro) domain to process Nsp3-Nsp4 cleavage. It has also been shown that the interaction of 3Ecto with the lumenal loop of Nsp4 is essential for ER rearrangements in cells infected with SARS-CoV or MHV. The Y domain, located at the cytosolic side of the ER, consists of the Y1 and CoV-Y subdomains, which are conserved in nidovirus and coronavirus, respectively. Functional information about the Y domain is limited; it has been shown that Nsp3 binding to Nsp4 is less efficient without the Y domain. Pssm-ID: 409665 Cd Length: 531 Bit Score: 354.68 E-value: 4.84e-107
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| CoV_NSP8 | pfam08717 | Coronavirus replicase NSP8; Viral NSP8 (non structural protein 8) forms a hexadecameric ... |
4014-4209 | 4.88e-105 | |||||||||
Coronavirus replicase NSP8; Viral NSP8 (non structural protein 8) forms a hexadecameric supercomplex with NSP7 that adopts a hollow cylinder-like structure. The dimensions of the central channel and positive electrostatic properties of the cylinder imply that it confers processivity on RNA-dependent RNA polymerase. NSP7 and NSP8 heterodimers play a role in the stabilization of NSP12 regions involved in RNA binding and are essential for a highly active NSP12 polymerase complex. It has been demonstrated that NSP8 acts as an oligo(U)-templated polyadenylyltransferase but also has robust (mono/oligo) adenylate transferase activities. NSP8 has N- and C-terminal D/ExD/E conserved motifs, being the N-terminal motif critical for RNA polymerase activity as these residues are part of the Mg2-binding active site. Pssm-ID: 400866 Cd Length: 197 Bit Score: 334.89 E-value: 4.88e-105
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| gammaCoV_Nsp5_Mpro | cd21667 | gammacoronavirus non-structural protein 5, also called Main protease (Mpro); This subfamily ... |
3336-3637 | 1.63e-91 | |||||||||
gammacoronavirus non-structural protein 5, also called Main protease (Mpro); This subfamily contains the coronavirus (CoV) non-structural protein 5 (Nsp5) also called the Main protease (Mpro), or 3C-like protease (3CLpro), found in gammacoronaviruses. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. Mpro/Nsp5 is a key enzyme in this process, making it a high value target for the development of anti-coronavirus therapeutics. These enzymes belong to the MEROPS peptidase C30 family, where the active site residues His and Cys form a catalytic dyad. The structures of Mpro/Nsp5 consist of three domains with the first two containing anti-parallel beta barrels and the third consisting of an arrangement of alpha-helices. The catalytic residues are found in a cleft between the first two domains. Mpro/Nsp5 requires a Gln residue in the P1 position of the substrate and space for only small amino-acid residues such as Gly, Ala, or Ser in the P1' position; since there is no known human protease with a specificity for Gln at the cleavage site of the substrate, these viral proteases are suitable targets for the development of antiviral drugs. Pssm-ID: 394888 Cd Length: 306 Bit Score: 300.94 E-value: 1.63e-91
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| TM_Y_MERS-CoV-like_Nsp3_C | cd21716 | C-terminus of non-structural protein 3, including transmembrane and Y domains, from Middle ... |
2287-2834 | 7.68e-91 | |||||||||
C-terminus of non-structural protein 3, including transmembrane and Y domains, from Middle East respiratory syndrome-related coronavirus and betacoronavirus in the C lineage; This model represents the C-terminus of non-structural protein 3 (Nsp3) from betacoronavirus in the merbecovirus subgenus (C lineage), including Middle East respiratory syndrome-related coronavirus (MERS-CoV) and Tylonycteris bat coronavirus HKU4. This conserved C-terminus includes two transmembrane (TM) regions TM1 and TM2, an ectodomain (3Ecto) between the TM1 and TM2 that is glycosylated and located on the lumenal side of the ER, an amphiphatic region (AH1) that is not membrane-spanning, and a large Y domain of approximately 370 residues. Nsp3 is a large multi-functional multi-domain protein that is an essential component of the replication/transcription complex (RTC), which carries out RNA synthesis, RNA processing, and interference with the host cell innate immune system. In the related betacoronaviruses, Severe acute respiratory syndrome-related coronavirus (SARS-CoV) and murine hepatitis virus (MHV), the TM1, 3Ecto and TM2 domains are important for the papain-like protease (PL2pro) domain to process Nsp3-Nsp4 cleavage. It has also been shown that the interaction of 3Ecto with the lumenal loop of Nsp4 is essential for ER rearrangements in cells infected with SARS-CoV or MHV. The Y domain, located at the cytosolic side of the ER, consists of the Y1 and CoV-Y subdomains, which are conserved in nidovirus and coronavirus, respectively. Functional information about the Y domain is limited; it has been shown that Nsp3 binding to Nsp4 is less efficient without the Y domain. Pssm-ID: 409664 Cd Length: 566 Bit Score: 309.05 E-value: 7.68e-91
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| TM_Y_HKU9-like_Nsp3_C | cd21715 | C-terminus of non-structural protein 3, including transmembrane and Y domains, from Rousettus ... |
2292-2837 | 4.09e-89 | |||||||||
C-terminus of non-structural protein 3, including transmembrane and Y domains, from Rousettus bat coronavirus HKU9 and betacoronavirus in the D lineage; This model represents the C-terminus of non-structural protein 3 (Nsp3) from betacoronavirus in the nobecovirus subgenus (D lineage), including Rousettus bat coronavirus HKU9. This conserved C-terminus includes two transmembrane (TM) regions TM1 and TM2, an ectodomain (3Ecto) between the TM1 and TM2 that is glycosylated and located on the lumenal side of the ER, an amphiphatic region (AH1) that is not membrane-spanning, and a large Y domain of approximately 370 residues. Nsp3 is a large multi-functional multi-domain protein that is an essential component of the replication/transcription complex (RTC), which carries out RNA synthesis, RNA processing, and interference with the host cell innate immune system. In the related betacoronaviruses, Severe acute respiratory syndrome-related coronavirus (SARS-CoV) and murine hepatitis virus (MHV), the TM1, 3Ecto and TM2 domains are important for the papain-like protease (PL2pro) domain to process Nsp3-Nsp4 cleavage. It has also been shown that the interaction of 3Ecto with the lumenal loop of Nsp4 is essential for ER rearrangements in cells infected with SARS-CoV or MHV. The Y domain, located at the cytosolic side of the ER, consists of the Y1 and CoV-Y subdomains, which are conserved in nidovirus and coronavirus, respectively. Functional information about the Y domain is limited; it has been shown that Nsp3 binding to Nsp4 is less efficient without the Y domain. Pssm-ID: 409663 Cd Length: 526 Bit Score: 302.55 E-value: 4.09e-89
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| alpha_betaCoV_Nsp2 | cd21511 | alpha- and betacoronavirus non-structural protein 2; Coronavirus Nsps are encoded in ORF1a and ... |
251-753 | 3.47e-85 | |||||||||
alpha- and betacoronavirus non-structural protein 2; Coronavirus Nsps are encoded in ORF1a and ORF1b. Post infection, the genomic RNA is released into the cytoplasm of the cell and translated into two long polyproteins (pp), pp1a and pp1ab, which are then autoproteolytically cleaved by two viral proteases Nsp3 and Nsp5 into smaller subunits. Nsp2 is one of these subunits. This alpha- and betacoronavirus family includes alphacoronavirus human coronavirus 229E (HCoV-229E) Nsp2, betacoronavirus Severe acute respiratory syndrome coronavirus (SARS-CoV) Nsp2, SARS-CoV-2 Nsp2, and Murine hepatitis virus (MHV) Nsp2 (also known as p65). The function of Nsp2 remains unclear. SARS-CoV Nsp2, rather than playing a role in viral replication, may be involved in altering the host cell environment; deletion of Nsp2 from the SARS-CoV genome results in only a modest reduction in viral titers. It has been shown to interact with two host proteins, prohibitin 1 (PHB1) and PHB2, which have been implicated in cellular functions, including cell-cycle progression, cell migration, cellular differentiation, apoptosis, and mitochondrial biogenesis. MHV Nsp2/p65, different from SARS-CoV Nsp2, may play an important role in the viral life cycle. This family may be distantly related to the gammacoronavirus Avian infectious bronchitis virus (IBV) Nsp2; IBV Nsp2 is a weak protein kinase R (PKR) antagonist, which may suggest that it plays a role in interfering with intracellular immunity. Pssm-ID: 439197 Cd Length: 399 Bit Score: 286.37 E-value: 3.47e-85
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| alpha_betaCoV_Nsp10 | cd21901 | alphacoronavirus and betacoronavirus non-structural protein 10; This model represents the ... |
4321-4450 | 5.37e-85 | |||||||||
alphacoronavirus and betacoronavirus non-structural protein 10; This model represents the non-structural protein 10 (Nsp10) of alpha- and betacoronaviruses, including highly pathogenic betacoronaviruses such as Severe acute respiratory syndrome-related coronavirus (SARS-CoV), SARS-CoV2 (also called 2019 novel CoV or 2019-nCoV), Middle East respiratory syndrome-related (MERS) CoV, and alphacoronaviruses such as Human coronavirus 229E. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. Upon processing of the Nsp7-10 region by protease M (Mpro), the released four small proteins Nsp7, Nsp8, Nsp9, and Nsp10 form functional complexes with CoV core enzymes and thereby stimulate replication. Coronaviruses cap their mRNAs; RNA cap methylation may involve at least three proteins: Nsp10, Nsp14, and Nsp16. Nsp10 serves as a cofactor for both Nsp14 and Nsp16. Nsp14 consists of 2 domains with different enzymatic activities: an N-terminal ExoN domain and a C-terminal cap (guanine-N7) methyltransferase (N7-MTase) domain. The association of Nsp10 with Nsp14 enhances Nsp14's exoribonuclease (ExoN) activity, and not its N7-Mtase activity. ExoN is important for proofreading and therefore, the prevention of lethal mutations. The Nsp10/Nsp14 complex hydrolyzes double-stranded RNA in a 3' to 5' direction as well as a single mismatched nucleotide at the 3'-end, mimicking an erroneous replication product, and may function in a replicative mismatch repair mechanism. Nsp16 Cap-0 specific (nucleoside-2'-O-)-methyltransferase (2'OMTase) acts sequentially to Nsp14 MTase in RNA capping methylation, and methylates the RNA cap at the ribose 2'-O position; it catalyzes the conversion of the cap-0 structure on m7GpppA-RNA to a cap-1 structure. The association of Nsp10 with Nsp16 enhances Nsp16's 2'OMTase activity, possibly through enhanced RNA binding affinity. Additionally, transmissible gastroenteritis virus (TGEV) Nsp10, Nsp16 and their complex can interact with DII4, which normally binds to Notch receptors; this interaction may disturb Notch signaling. Nsp10 also binds 2 zinc ions with high affinity. Pssm-ID: 409326 Cd Length: 130 Bit Score: 274.55 E-value: 5.37e-85
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| CoV_NSP6 | pfam19213 | Coronavirus replicase NSP6; This entry represents proteins found in Coronaviruses and includes ... |
3665-3924 | 5.12e-84 | |||||||||
Coronavirus replicase NSP6; This entry represents proteins found in Coronaviruses and includes the Non-structural Protein 6 (NSP6). Coronaviruses encode large replicase polyproteins which are proteolytically processed by viral proteases to generate mature Nonstructural Proteins (NSPs). NSP6 is a membrane protein containing 6 transmembrane domains with a large C-terminal tail. NSP6 from the avian coronavirus, infectious bronchitis virus (IBV) and the mouse hepatitis virus (MHV) have been shown to localize to the ER and to generate autophagosomes. Coronavirus NSP6 proteins have also been shown to limit autophagosome expansion. This may favour coronavirus infection by reducing the ability of autophagosomes to deliver viral components to lysosomes for degradation. NSP6 from IBV, MHV and severe acute respiratory syndrome coronavirus (SARS-CoV) have also been found to activate autophagy. Pssm-ID: 465997 Cd Length: 260 Bit Score: 277.59 E-value: 5.12e-84
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| MHV-like_Nsp3_NAB | cd21824 | nucleic acid binding domain of non-structural protein 3 from murine hepatitis virus and ... |
1945-2063 | 6.69e-83 | |||||||||
nucleic acid binding domain of non-structural protein 3 from murine hepatitis virus and betacoronavirus in the A lineage; This model represents the nucleic acid binding (NAB) domain of non-structural protein 3 (Nsp3) from betacoronavirus in the embecovirus subgenus (A lineage), including murine hepatitis virus (MHV) and Human coronavirus HKU1. The NAB domain represents a new fold, with a parallel four-strand beta-sheet holding two alpha-helices of three and four turns that are oriented antiparallel to the beta-strands. NAB is a cytoplasmic domain located between the papain-like protease (PLPro) and betacoronavirus-specific marker (betaSM) domains of CoV Nsp3. Nsp3 is a large multi-functional multi-domain protein that is an essential component of the replication/transcription complex (RTC), which carries out RNA synthesis, RNA processing, and interference with the host cell innate immune system. The NAB domain both binds ssRNA and unwinds dsDNA. It prefers to bind ssRNA containing repeats of three consecutive guanines. A group of residues that form a positively charged patch on the protein surface of SARS-CoV Nsp3 NAB serves as the binding site of nucleic acids. This site is conserved in the NAB of Nsp3 from betacoronavirus in the sarbecovirus subgenus (B lineage), but is not conserved in the Nsp3 NAB from betacoronaviruses in the A lineage. Pssm-ID: 409350 Cd Length: 119 Bit Score: 268.17 E-value: 6.69e-83
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| MHV-like_Nsp3_betaSM | cd21812 | betacoronavirus-specific marker of non-structural protein 3 from murine hepatitis virus and ... |
2111-2234 | 2.60e-79 | |||||||||
betacoronavirus-specific marker of non-structural protein 3 from murine hepatitis virus and betacoronavirus in the A lineage; This model represents the betacoronavirus-specific marker (betaSM), also called group 2-specific marker (G2M), of non-structural protein 3 (Nsp3) from betacoronavirus in the embecovirus subgenus (A lineage), including murine hepatitis virus (MHV) and Human coronavirus HKU1. The betaSM/G2M is located C-terminal to the nucleic acid-binding (NAB) domain. This region is absent in alpha- and deltacoronavirus Nsp3; there is a gammacoronavirus-specific marker (gammaSM) at this position in gammacoronavirus Nsp3. Nsp3 is a large multi-functional multi-domain protein that is an essential component of the replication/transcription complex (RTC), which carries out RNA synthesis, RNA processing, and interference with the host cell innate immune system. Little is known about the betaSM/G2M domain; it is predicted to be non-enzymatic and may be an intrinsically disordered region. The betaSM/G2M domain is part of the predicted PLnc domain (made up of 385 amino acids) of the related SARS-CoV Nsp3 that may function as a replication/transcription scaffold, with interactions to Nsp5, Nsp12, Nsp13, Nsp14, and Nsp16. Pssm-ID: 409627 Cd Length: 125 Bit Score: 258.00 E-value: 2.60e-79
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| CoV_NSP10 | pfam09401 | Coronavirus RNA synthesis protein NSP10; Non-structural protein 10 (NSP10) is involved in RNA ... |
4332-4450 | 6.77e-73 | |||||||||
Coronavirus RNA synthesis protein NSP10; Non-structural protein 10 (NSP10) is involved in RNA synthesis. It is synthesized as a polyprotein whose cleavage generates many non-structural proteins. NSP10 contains two zinc binding motifs and forms two anti-parallel helices which are stacked against an irregular beta sheet. A cluster of basic residues on the protein surface suggests a nucleic acid-binding function. NSP10 interacts with NSP14 and NSP16 and regulates their respective ExoN and 2-O-MTase activities. When binding to the N-terminal of NSP14, nsp10 allows the ExoN active site to adopt a stably closed conformation and is an allosteric regulator that stabilizes NSP16. The residue Tyr-96 plays a crucial role in the NSP10-NSP16/NSP14 interaction. This residue is specific for SARS-CoV NSP10 and is a phenylalanine in most other Coronavirus homologs. Pssm-ID: 462788 Cd Length: 119 Bit Score: 239.65 E-value: 6.77e-73
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| deltaCoV_Nsp5_Mpro | cd21668 | deltacoronavirus non-structural protein 5, also called Main protease (Mpro); This subfamily ... |
3334-3630 | 1.71e-71 | |||||||||
deltacoronavirus non-structural protein 5, also called Main protease (Mpro); This subfamily contains the coronavirus (CoV) non-structural protein 5 (Nsp5) also called the Main protease (Mpro), or 3C-like protease (3CLpro), found in deltacoronaviruses. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. Mpro/Nsp5 is a key enzyme in this process, making it a high value target for the development of anti-coronavirus therapeutics. These enzymes belong to the MEROPS peptidase C30 family, where the active site residues His and Cys form a catalytic dyad. The structures of Mpro/Nsp5 consist of three domains with the first two containing anti-parallel beta barrels and the third consisting of an arrangement of alpha-helices. The catalytic residues are found in a cleft between the first two domains. Mpro/Nsp5 requires a Gln residue in the P1 position of the substrate and space for only small amino-acid residues such as Gly, Ala, or Ser in the P1' position; since there is no known human protease with a specificity for Gln at the cleavage site of the substrate, these viral proteases are suitable targets for the development of antiviral drugs. Pssm-ID: 394889 Cd Length: 302 Bit Score: 243.18 E-value: 1.71e-71
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| betaCoV_Nsp9 | cd21898 | betacoronavirus non-structural protein 9; This model represents the non-structural protein 9 ... |
4211-4320 | 1.68e-69 | |||||||||
betacoronavirus non-structural protein 9; This model represents the non-structural protein 9 (Nsp9) from betacoronaviruses including highly pathogenic Severe acute respiratory syndrome-related coronavirus (SARS-CoV), SARS-CoV2 (also called 2019 novel CoV or 2019-nCoV), and Middle East respiratory syndrome-related (MERS) CoV. CoVs utilize a multi-subunit replication/transcription machinery assembled from a set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins. All of these Nsps, except for Nsp1 and Nsp2, are considered essential for transcription, replication, and translation of the viral RNA. Nsp9, with Nsp7, Nsp8, and Nsp10, localizes within the replication complex. Nsp9 is an essential single-stranded RNA-binding protein for coronavirus replication; it shares structural similarity to the oligosaccharide-binding (OB) fold, which is characteristic of proteins that bind to ssDNA or ssRNA. Nsp9 requires dimerization for binding and orienting RNA for subsequent use by the replicase machinery. CoV Nsp9s have diverse forms of dimerization that promote their biological function, which may help elucidate the mechanism underlying CoVs replication and contribute to the development of antiviral drugs. Generally, dimers are formed via interaction of the parallel alpha-helices containing the protein-protein interaction motif GXXXG; additionally, the N-finger region may also play a critical role in dimerization as seen in porcine delta coronavirus (PDCoV) Nsp9. As a member of the replication complex, Nsp9 may not have a specific RNA-binding sequence but may act in conjunction with other Nsps as a processivity factor, as shown by mutation studies indicating that Nsp9 is a key ingredient that intimately engages other proteins in the replicase complex to mediate efficient virus transcription and replication. Pssm-ID: 409331 Cd Length: 111 Bit Score: 229.59 E-value: 1.68e-69
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| CoV_Nsp8 | cd21816 | Coronavirus non-structural protein 8; This model represents the non-structural protein 8 (Nsp8) ... |
4017-4204 | 2.63e-67 | |||||||||
Coronavirus non-structural protein 8; This model represents the non-structural protein 8 (Nsp8) of alpha-, beta-, gamma- and deltacoronaviruses, including highly pathogenic betacoronaviruses such as Severe acute respiratory syndrome-related coronavirus (SARS-CoV), SARS-CoV2 (also called 2019 novel CoV or 2019-nCoV), and Middle East respiratory syndrome-related (MERS) CoV. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. Upon processing of the Nsp7-10 region by protease M (Mpro), the released four small proteins Nsp7, Nsp8, Nsp9, and Nsp10 form functional complexes with CoV core enzymes and thereby stimulate replication. Most importantly, a complex of Nsp8 with Nsp7 has been shown to activate and confer processivity to the RNA-synthesizing activity of Nsp12, the RNA-dependent RNA-polymerase (RdRp); in SARS-CoV, point mutations in the genes encoding Nsp8 and Nsp7 have been shown to delay virus growth. Nsp8 and Nsp7 cooperate in activating the primer-dependent activity of the Nsp12 RdRp such that the level of their association may constitute a limiting factor for obtaining a high RNA polymerase activity. The subsequent Nsp7/Nsp8/Nsp12 polymerase complex is then able to associate with an active bifunctional Nsp14, which includes N-terminal 3' to 5' exoribonuclease (ExoN) and C-terminal N7-guanine cap methyltransferase (N7-MTase) activities, thus representing a unique coronavirus Nsp assembly that incorporates RdRp, exoribonuclease, and N7-MTase activities. Interaction of Nsp8 with Nsp7 appears to be conserved across the coronavirus family, making these proteins interesting drug targets. Nsp8 has a novel 'golf-club' fold composed of an N-terminal 'shaft' domain and a C-terminal 'head' domain. The shaft domain contains three helices, one of which is very long, while the head domain contains another three helices and seven beta-strands, forming an alpha/beta fold. SARS-CoV Nsp8 forms a 8:8 hexadecameric supercomplex with Nsp7 that adopts a hollow cylinder-like structure with a large central channel and positive electrostatic properties in the cylinder, while Feline infectious peritonitis virus Nsp8 forms a 1:2 heterotrimer with Nsp7. Regardless of their oligomeric structure, the Nsp7/Nsp8 complex functions as a noncanonical RNA polymerase capable of synthesizing RNA of up to the template length. Pssm-ID: 409256 Cd Length: 194 Bit Score: 226.64 E-value: 2.63e-67
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| alphaCoV_Nsp8 | cd21830 | alphacoronavirus non-structural protein 8; This model represents the non-structural protein 8 ... |
4017-4210 | 4.10e-67 | |||||||||
alphacoronavirus non-structural protein 8; This model represents the non-structural protein 8 (Nsp8) region of alphacoronaviruses that include Feline infectious peritonitis virus (FCoV), Human coronavirus NL63 (HCoV-NL63), and Porcine epidemic diarrhea coronavirus (PEDV), among others. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. Upon processing of the Nsp7-10 region by protease M (Mpro), the released four small proteins Nsp7, Nsp8, Nsp9, and Nsp10 form functional complexes with CoV core enzymes and thereby stimulate replication. Most importantly, a complex of Nsp8 with Nsp7 has been shown to activate and confer processivity to the RNA-synthesizing activity of Nsp12, the RNA-dependent RNA-polymerase (RdRp); in SARS-CoV, point mutations in the genes encoding Nsp8 and Nsp7 have been shown to delay virus growth. Nsp8 and Nsp7 cooperate in activating the primer-dependent activity of the Nsp12 RdRp such that the level of their association may constitute a limiting factor for obtaining a high RNA polymerase activity. The subsequent Nsp7/Nsp8/Nsp12 polymerase complex is then able to associate with an active bifunctional Nsp14, which includes N-terminal 3' to 5' exoribonuclease (ExoN) and C-terminal N7-guanine cap methyltransferase (N7-MTase) activities, thus representing a unique coronavirus Nsp assembly that incorporates RdRp, exoribonuclease, and N7-MTase activities. Interaction of Nsp8 with Nsp7 appears to be conserved across the coronavirus family, making these proteins interesting drug targets. Nsp8 has a novel 'golf-club' fold composed of an N-terminal 'shaft' domain and a C-terminal 'head' domain. The shaft domain contains three helices, one of which is very long, while the head domain contains another three helices and seven beta-strands, forming an alpha/beta fold. FCoV Nsp8 forms a 1:2 heterotrimer with Nsp7; the Nsp7/Nsp8 complex functions as a noncanonical RNA polymerase capable of synthesizing RNA of up to the template length. Pssm-ID: 409257 Cd Length: 195 Bit Score: 226.08 E-value: 4.10e-67
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| bCoV_NAB | pfam16251 | Betacoronavirus nucleic acid-binding (NAB); This is the nucleic acid-binding domain (NAB) from ... |
1949-2063 | 2.44e-64 | |||||||||
Betacoronavirus nucleic acid-binding (NAB); This is the nucleic acid-binding domain (NAB) from the multidomain nonstructural protein NSP3, and described as NSP3e domain. NSP3 is part of Orf1a polyproteins in SARS-CoV. It is an essential component of the replication/transcription complex. The global domain of the NAB represents a new fold, with a parallel four-strand beta-sheet holding two alpha-helices of three and four turns that are oriented antiparallel to the beta-strands and a group of residues form a positively charged patch on the protein surface as the binding site responsible for binding affinity for nucleic acids. When binding to ssRNA, the NAB prefers sequences with repeats of three consecutive Gs, such as (GGGA)5 and (GGGA)2. A positively charged surface patch (Lys75, Lys76, Lys99, and Arg106) is involved in RNA binding. Pssm-ID: 406621 Cd Length: 129 Bit Score: 215.49 E-value: 2.44e-64
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| CoV_Nsp10 | cd21872 | coronavirus non-structural protein 10; This model represents the non-structural protein 10 ... |
4321-4449 | 1.09e-60 | |||||||||
coronavirus non-structural protein 10; This model represents the non-structural protein 10 (Nsp10) of alpha-, beta-, gamma- and deltacoronaviruses, including highly pathogenic betacoronaviruses such as Severe acute respiratory syndrome-related coronavirus (SARS-CoV), SARS-CoV2 (also called 2019 novel CoV or 2019-nCoV), and Middle East respiratory syndrome-related (MERS) CoV. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. Upon processing of the Nsp7-10 region by protease M (Mpro), the released four small proteins Nsp7, Nsp8, Nsp9, and Nsp10 form functional complexes with CoV core enzymes and thereby stimulate replication. Coronaviruses cap their mRNAs; RNA cap methylation may involve at least three proteins: Nsp10, Nsp14, and Nsp16. Nsp10 serves as a cofactor for both Nsp14 and Nsp16. Nsp14 consists of 2 domains with different enzymatic activities: an N-terminal ExoN domain and a C-terminal cap (guanine-N7) methyltransferase (N7-MTase) domain. The association of Nsp10 with Nsp14 enhances Nsp14's exoribonuclease (ExoN) activity, and not its N7-Mtase activity. ExoN is important for proofreading and therefore, the prevention of lethal mutations. The Nsp10/Nsp14 complex hydrolyzes double-stranded RNA in a 3' to 5' direction as well as a single mismatched nucleotide at the 3'-end, mimicking an erroneous replication product, and may function in a replicative mismatch repair mechanism. Nsp16 Cap-0 specific (nucleoside-2'-O-)-methyltransferase (2'OMTase) acts sequentially to Nsp14 MTase in RNA capping methylation, and methylates the RNA cap at the ribose 2'-O position; it catalyzes the conversion of the cap-0 structure on m7GpppA-RNA to a cap-1 structure. The association of Nsp10 with Nsp16 enhances Nsp16's 2'OMTase activity, possibly through enhanced RNA binding affinity. Additionally, transmissible gastroenteritis virus (TGEV) Nsp10, Nsp16, and their complex can interact with DII4, which normally binds to Notch receptors; this interaction may disturb Notch signaling. Nsp10 also binds 2 zinc ions with high affinity. Pssm-ID: 409325 Cd Length: 131 Bit Score: 205.01 E-value: 1.09e-60
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| CoV_NSP9 | pfam08710 | Coronavirus replicase NSP9; Nsp9 is a single-stranded RNA-binding viral protein involved in ... |
4211-4320 | 4.21e-58 | |||||||||
Coronavirus replicase NSP9; Nsp9 is a single-stranded RNA-binding viral protein involved in RNA synthesis. Several crystallographic structures of nsp9 have shown that it is composed of seven beta strands and a single alpha helix. Nsp9 proteins have N-finger motifs and highly conserved GXXXG motifs that both play critical roles in dimerization. The conserved helix-helix dimer interface containing a GXXXG protein-protein interaction motif is biologically relevant to SARS-CoV replication. Pssm-ID: 285872 Cd Length: 111 Bit Score: 196.93 E-value: 4.21e-58
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| TM_Y_CoV_Nsp3_C | cd21686 | C-terminus of coronavirus non-structural protein 3, including transmembrane and Y domains; ... |
2329-2832 | 6.18e-56 | |||||||||
C-terminus of coronavirus non-structural protein 3, including transmembrane and Y domains; This model represents the C-terminus of non-structural protein 3 (Nsp3) from alpha-, beta-, gamma-, and deltacoronavirus, including highly pathogenic betacoronaviruses such as Severe acute respiratory syndrome-related coronavirus (SARS-CoV), SARS-CoV2 (also called 2019 novel CoV or 2019-nCoV), and Middle East respiratory syndrome-related (MERS) CoV. This conserved C-terminus includes two transmembrane (TM) regions TM1 and TM2, an ectodomain (3Ecto) between the TM1 and TM2 that is glycosylated and located on the lumenal side of the ER, an amphiphatic region (AH1) that is not membrane-spanning, and a large Y domain of approximately 370 residues. Nsp3 is a large multi-functional multi-domain protein that is an essential component of the replication/transcription complex (RTC), which carries out RNA synthesis, RNA processing, and interference with the host cell innate immune system. In SARS-CoV and murine hepatitis virus (MHV), the TM1, 3Ecto and TM2 domains are important for the papain-like protease (PL2pro) domain to process Nsp3-Nsp4 cleavage. It has also been shown that the interaction of 3Ecto with the lumenal loop of Nsp4 is essential for ER rearrangements in cells infected with SARS-CoV or MHV. The Y domain, located at the cytosolic side of the ER, consists of the Y1 and CoV-Y subdomains, which are conserved in nidovirus and coronavirus, respectively. Functional information about the Y domain is limited; it has been shown that Nsp3 binding to Nsp4 is less efficient without the Y domain. Pssm-ID: 409657 Cd Length: 476 Bit Score: 204.35 E-value: 6.18e-56
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| gammaCoV_Nsp8 | cd21832 | gammacoronavirus non-structural protein 8; This model represents the non-structural protein 8 ... |
4014-4210 | 1.56e-51 | |||||||||
gammacoronavirus non-structural protein 8; This model represents the non-structural protein 8 (Nsp8) region of gammacoronaviruses that include Avian infectious bronchitis virus (IBV) and Canada goose coronavirus (CGCoV), among others. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. Upon processing of the Nsp7-10 region by protease M (Mpro), the released four small proteins Nsp7, Nsp8, Nsp9, and Nsp10 form functional complexes with CoV core enzymes and thereby stimulate replication. Most importantly, a complex of Nsp8 with Nsp7 has been shown to activate and confer processivity to the RNA-synthesizing activity of Nsp12, the RNA-dependent RNA-polymerase (RdRp); in SARS-CoV, point mutations in the genes encoding Nsp8 and Nsp7 have been shown to delay virus growth. Nsp8 and Nsp7 cooperate in activating the primer-dependent activity of the Nsp12 RdRp such that the level of their association may constitute a limiting factor for obtaining a high RNA polymerase activity. The subsequent Nsp7/Nsp8/Nsp12 polymerase complex is then able to associate with an active bifunctional Nsp14, which includes N-terminal 3' to 5' exoribonuclease (ExoN) and C-terminal N7-guanine cap methyltransferase (N7-MTase) activities, thus representing a unique coronavirus Nsp assembly that incorporates RdRp, exoribonuclease, and N7-MTase activities. Interaction of Nsp8 with Nsp7 appears to be conserved across the coronavirus family, making these proteins interesting drug targets. Nsp8 has a novel 'golf-club' fold composed of an N-terminal 'shaft' domain and a C-terminal 'head' domain. The shaft domain contains three helices, one of which is very long, while the head domain contains another three helices and seven beta-strands, forming an alpha/beta fold. SARS-CoV Nsp8 forms a 8:8 hexadecameric supercomplex with Nsp7 that adopts a hollow cylinder-like structure with a large central channel and positive electrostatic properties in the cylinder, while Feline infectious peritonitis virus Nsp8 forms a 1:2 heterotrimer with Nsp7. Regardless of their oligomeric structure, the Nsp7/Nsp8 complex functions as a noncanonical RNA polymerase capable of synthesizing RNA of up to the template length. Pssm-ID: 409259 Cd Length: 210 Bit Score: 182.08 E-value: 1.56e-51
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| CoV_NSP4_C | pfam16348 | Coronavirus replicase NSP4, C-terminal; This is the C-terminal domain of the coronavirus ... |
3238-3332 | 3.68e-49 | |||||||||
Coronavirus replicase NSP4, C-terminal; This is the C-terminal domain of the coronavirus nonstructural protein 4 (NSP4). NSP4 is encoded by ORF1a/1ab and proteolytically released from the pp1a/1ab polyprotein. It is a membrane-spanning protein which is thought to anchor the viral replication-transcription complex (RTC) to modified endoplasmic reticulum membranes. This predominantly alpha-helical domain may be involved in protein-protein interactions. It has been shown that in Betacoronavirus, the coexpression of NSP3 and NSP4 results in a membrane rearrangement to induce double-membrane vesicles (DMVs) and convoluted membranes (CMs), playing a critical role in SARS-CoV replication. There are two well conserved amino acid residues (H120 and F121) in NSP4 among Betacoronavirus, essential for membrane rearrangements during interaction with NSP3. Pssm-ID: 465099 Cd Length: 92 Bit Score: 170.79 E-value: 3.68e-49
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| alphaCoV-Nsp6 | cd21558 | alphacoronavirus non-structural protein 6; Coronaviruses (CoV) redirect and rearrange host ... |
3623-3924 | 9.15e-49 | |||||||||
alphacoronavirus non-structural protein 6; Coronaviruses (CoV) redirect and rearrange host cell membranes as part of the viral genome replication and transcription machinery; they induce the formation of double-membrane vesicles in infected cells. CoV non-structural protein 6 (Nsp6), a transmembrane-containing protein, together with Nsp3 and Nsp4, have the ability to induce double-membrane vesicles that are similar to those observed in severe acute respiratory syndrome (SARS) coronavirus-infected cells. By itself, Nsp6 can generate autophagosomes from the endoplasmic reticulum. Autophagosomes are normally generated as a cellular response to starvation to carry cellular organelles and long-lived proteins to lysosomes for degradation. Degradation through autophagy may provide an innate defense against virus infection, or conversely, autophagosomes can promote infection by facilitating the assembly of replicase proteins. In addition to initiating autophagosome formation, Nsp6 also limits autophagosome expansion regardless of how they were induced, i.e. whether they were induced directly by Nsp6, or indirectly by starvation or chemical inhibition of MTOR signaling. This may favor coronavirus infection by compromising the ability of autophagosomes to deliver viral components to lysosomes for degradation. Pssm-ID: 394844 Cd Length: 293 Bit Score: 177.39 E-value: 9.15e-49
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| TM_Y_alphaCoV_Nsp3_C | cd21712 | C-terminus of alphacoronavirus non-structural protein 3, including transmembrane and Y domains; ... |
2350-2837 | 5.33e-47 | |||||||||
C-terminus of alphacoronavirus non-structural protein 3, including transmembrane and Y domains; This model represents the C-terminus of non-structural protein 3 (Nsp3) from alphacoronavirus, including Porcine epidemic diarrhea virus and Human coronavirus 229E, among others. This conserved C-terminus includes two transmembrane (TM) regions TM1 and TM2, an ectodomain (3Ecto) between the TM1 and TM2 that is glycosylated and located on the lumenal side of the ER, an amphiphatic region (AH1) that is not membrane-spanning, and a large Y domain of approximately 370 residues. Nsp3 is a large multi-functional multi-domain protein that is an essential component of the replication/transcription complex (RTC), which carries out RNA synthesis, RNA processing, and interference with the host cell innate immune system. In the related betacoronaviruses, Severe acute respiratory syndrome-related coronavirus (SARS-CoV) and murine hepatitis virus (MHV), the TM1, 3Ecto and TM2 domains are important for the papain-like protease (PL2pro) domain to process Nsp3-Nsp4 cleavage. It has also been shown that the interaction of 3Ecto with the lumenal loop of Nsp4 is essential for ER rearrangements in cells infected with SARS-CoV or MHV. The Y domain, located at the cytosolic side of the ER, consists of the Y1 and CoV-Y subdomains, which are conserved in nidovirus and coronavirus, respectively. Functional information about the Y domain is limited; it has been shown that Nsp3 binding to Nsp4 is less efficient without the Y domain. Pssm-ID: 409660 Cd Length: 501 Bit Score: 178.59 E-value: 5.33e-47
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| DPUP_MHV_Nsp3 | cd21524 | DPUP (domain preceding Ubl2 and PLP2) of non-structural protein 3 (Nsp3) from murine hepatitis ... |
1536-1610 | 3.90e-46 | |||||||||
DPUP (domain preceding Ubl2 and PLP2) of non-structural protein 3 (Nsp3) from murine hepatitis virus and related betacoronaviruses in the A lineage; This subfamily contains the DPUP (domain preceding Ubl2 and PLP2) of murine hepatitis virus (MHV) non-structural protein 3 (Nsp3) and other Nsp3s from betacoronaviruses in the embecovirus subgenera (A lineage), including human CoV OC43, rabbit CoV HKU14 and porcine hemagglutinating encephalomyelitis virus (HEV), among others. Non-structural protein 3 (Nsp3) is a large multi-functional multi-domain protein that is an essential component of the replication/transcription complex (RTC), which carries out RNA synthesis, RNA processing, and interference with the host cell innate immune system. MHV Nsp3 contains a DPUP that is located N-terminal to the ubiquitin-like domain 2 (Ubl2) and papain-like protease 2 (PLP2) catalytic domain. It is structurally similar to the Severe Acute Respiratory Syndrome (SARS) CoV unique domain C (SUD-C), adopting a frataxin-like fold that has structural similarity to DNA-binding domains of DNA-modifying enzymes. SUD-C is also located N-terminal to Ubl2 and PLP2 in SARS Nsp3, similar to the DPUP of MHV Nsp3; however, unlike DPUP, it is preceded by SUD-N and SUD-M macrodomains that are absent in MHV Nsp3. Though structurally similar, there is little sequence similarity between DPUP and SUD-C. SARS SUD-C has been shown to bind to single-stranded RNA and recognize purine bases more strongly than pyrimidine bases; it also regulates the RNA binding behavior of the SARS SUD-M macrodomain. It is not known whether DPUP functions in the same way. Pssm-ID: 394840 Cd Length: 75 Bit Score: 161.43 E-value: 3.90e-46
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| gammaCoV_Nsp10 | cd21902 | gammacoronavirus non-structural protein 10; This model represents the non-structural protein ... |
4322-4449 | 1.42e-43 | |||||||||
gammacoronavirus non-structural protein 10; This model represents the non-structural protein 10 (Nsp10) of gammacoronaviruses, including Infectious bronchitis virus (IBV)and Bottlenose dolphin coronavirus HKU22(BdCoV HKU22). CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. Upon processing of the Nsp7-10 region by protease M (Mpro), the released four small proteins Nsp7, Nsp8, Nsp9, and Nsp10 form functional complexes with CoV core enzymes and thereby stimulate replication. Coronaviruses cap their mRNAs; RNA cap methylation may involve at least three proteins: Nsp10, Nsp14, and Nsp16. Nsp10 serves as a cofactor for both Nsp14 and Nsp16. Nsp14 consists of 2 domains with different enzymatic activities: an N-terminal ExoN domain and a C-terminal cap (guanine-N7) methyltransferase (N7-MTase) domain. The association of Nsp10 with Nsp14 enhances Nsp14's exoribonuclease (ExoN) activity, and not its N7-Mtase activity. ExoN is important for proofreading and therefore, the prevention of lethal mutations. The Nsp10/Nsp14 complex hydrolyzes double-stranded RNA in a 3' to 5' direction as well as a single mismatched nucleotide at the 3'-end, mimicking an erroneous replication product, and may function in a replicative mismatch repair mechanism. Nsp16 Cap-0 specific (nucleoside-2'-O-)-methyltransferase (2'OMTase) acts sequentially to Nsp14 MTase in RNA capping methylation and methylates the RNA cap at the ribose 2'-O position; it catalyzes the conversion of the cap-0 structure on m7GpppA-RNA to a cap-1 structure. The association of Nsp10 with Nsp16 enhances Nsp16's 2'OMTase activity, possibly through enhanced RNA binding affinity. Additionally, transmissible gastroenteritis virus (TGEV) Nsp10, Nsp16 and their complex can interact with DII4, which normally binds to Notch receptors; this interaction may disturb Notch signaling. Nsp10 also binds 2 zinc ions with high affinity. Pssm-ID: 409327 Cd Length: 134 Bit Score: 156.21 E-value: 1.42e-43
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| deltaCoV_Nsp10 | cd21903 | deltacoronavirus non-structural protein 10; This model represents the non-structural protein ... |
4322-4450 | 3.78e-42 | |||||||||
deltacoronavirus non-structural protein 10; This model represents the non-structural protein 10 (Nsp10) of deltacoronaviruses, including Thrush coronavirus HKU12-600 and Wigeon coronavirus HKU20. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. Upon processing of the Nsp7-10 region by protease M (Mpro), the released four small proteins Nsp7, Nsp8, Nsp9, and Nsp10 form functional complexes with CoV core enzymes and thereby stimulate replication. Coronaviruses cap their mRNAs; RNA cap methylation may involve at least three proteins: Nsp10, Nsp14, and Nsp16. Nsp10 serves as a cofactor for both Nsp14 and Nsp16. Nsp14 consists of 2 domains with different enzymatic activities: an N-terminal ExoN domain and a C-terminal cap (guanine-N7) methyltransferase (N7-MTase) domain. The association of Nsp10 with Nsp14 enhances Nsp14's exoribonuclease (ExoN) activity, and not its N7-Mtase activity. ExoN is important for proofreading and therefore, the prevention of lethal mutations. The Nsp10/Nsp14 complex hydrolyzes double-stranded RNA in a 3' to 5' direction as well as a single mismatched nucleotide at the 3'-end, mimicking an erroneous replication product, and may function in a replicative mismatch repair mechanism. Nsp16 Cap-0 specific (nucleoside-2'-O-)-methyltransferase (2'OMTase) acts sequentially to Nsp14 MTase in RNA capping methylation and methylates the RNA cap at the ribose 2'-O position; it catalyzes the conversion of the cap-0 structure on m7GpppA-RNA to a cap-1 structure. The association of Nsp10 with Nsp16 enhances Nsp16's 2'OMTase activity, possibly through enhanced RNA binding affinity. Additionally, transmissible gastroenteritis virus (TGEV) Nsp10, Nsp16 and their complex can interact with DII4, which normally binds to Notch receptors; this interaction may disturb Notch signaling. Nsp10 also binds 2 zinc ions with high affinity. Pssm-ID: 409328 Cd Length: 128 Bit Score: 151.94 E-value: 3.78e-42
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| betaCoV_Nsp3_NAB | cd21795 | nucleic acid binding domain of betacoronavirus non-structural protein 3; This model represents ... |
1955-2063 | 4.61e-41 | |||||||||
nucleic acid binding domain of betacoronavirus non-structural protein 3; This model represents the nucleic acid binding (NAB) domain of non-structural protein 3 (Nsp3) from betacoronavirus including highly pathogenic human coronaviruses (CoVs) such as Severe acute respiratory syndrome-related coronavirus (SARS-CoV) and SARS-CoV2 (also called 2019 novel CoV or 2019-nCoV). The NAB domain represents a new fold, with a parallel four-strand beta-sheet holding two alpha-helices of three and four turns that are oriented antiparallel to the beta-strands. NAB is a cytoplasmic domain located between the papain-like protease (PLPro) and betacoronavirus-specific marker (betaSM) domains of CoV Nsp3. Nsp3 is a large multi-functional multi-domain protein that is an essential component of the replication/transcription complex (RTC), which carries out RNA synthesis, RNA processing, and interference with the host cell innate immune system. The NAB domain both binds ssRNA and unwinds dsDNA. It prefers to bind ssRNA containing repeats of three consecutive guanines. A group of residues that form a positively charged patch on the protein surface of SARS-CoV Nsp3 NAB serves as the binding site of nucleic acids. This site is conserved in the NAB of Nsp3 from betacoronavirus in the sarbecovirus subgenus (B lineage), but may not be conserved in the Nsp3 NAB from betacoronaviruses in other lineages. Pssm-ID: 409347 Cd Length: 110 Bit Score: 148.10 E-value: 4.61e-41
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| CoV_Nsp6 | cd21526 | coronavirus non-structural protein 6; Coronaviruses (CoV) redirect and rearrange host cell ... |
3627-3924 | 1.84e-39 | |||||||||
coronavirus non-structural protein 6; Coronaviruses (CoV) redirect and rearrange host cell membranes as part of the viral genome replication and transcription machinery; they induce the formation of double-membrane vesicles in infected cells. CoV non-structural protein 6 (Nsp6), a transmembrane-containing protein, together with Nsp3 and Nsp4, have the ability to induce double-membrane vesicles that are similar to those observed in severe acute respiratory syndrome (SARS) coronavirus-infected cells. By itself, Nsp6 can generate autophagosomes from the endoplasmic reticulum. Autophagosomes are normally generated as a cellular response to starvation to carry cellular organelles and long-lived proteins to lysosomes for degradation. Degradation through autophagy may provide an innate defense against virus infection, or conversely, autophagosomes can promote infection by facilitating the assembly of replicase proteins. In addition to initiating autophagosome formation, Nsp6 also limits autophagosome expansion regardless of how they were induced, i.e. whether they were induced directly by Nsp6, or indirectly by starvation or chemical inhibition of MTOR signaling. This may favor coronavirus infection by compromising the ability of autophagosomes to deliver viral components to lysosomes for degradation. Pssm-ID: 394843 Cd Length: 287 Bit Score: 150.37 E-value: 1.84e-39
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| betaCoV_Nsp3_betaSM | cd21727 | betacoronavirus-specific marker of betacoronavirus non-structural protein 3; This model ... |
2111-2234 | 4.09e-39 | |||||||||
betacoronavirus-specific marker of betacoronavirus non-structural protein 3; This model represents the betacoronavirus-specific marker (betaSM), also called group 2-specific marker (G2M), of non-structural protein 3 (Nsp3) from betacoronavirus, including highly pathogenic human coronaviruses such as Severe acute respiratory syndrome-related coronavirus (SARS-CoV) and SARS-CoV2 (also called 2019 novel CoV or 2019-nCoV). The betaSM/G2M is located C-terminal to the nucleic acid-binding (NAB) domain. This region is absent in alpha- and deltacoronavirus Nsp3; there is a gammacoronavirus-specific marker (gammaSM) at this position in gammacoronavirus Nsp3. Nsp3 is a large multi-functional multi-domain protein that is an essential component of the replication/transcription complex (RTC), which carries out RNA synthesis, RNA processing, and interference with the host cell innate immune system. Little is known about the betaSM/G2M domain; it is predicted to be non-enzymatic and may be an intrinsically disordered region. The betaSM/G2M domain is part of the predicted PLnc domain (made up of 385 amino acids) of SARS-CoV Nsp3 that may function as a replication/transcription scaffold, with interactions to Nsp5, Nsp12, Nsp13, Nsp14, and Nsp16. Pssm-ID: 409626 Cd Length: 125 Bit Score: 143.44 E-value: 4.09e-39
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| CoV_peptidase | pfam08715 | Coronavirus papain-like peptidase; This entry contains coronavirus cysteine endopeptidases ... |
1610-1917 | 6.92e-38 | |||||||||
Coronavirus papain-like peptidase; This entry contains coronavirus cysteine endopeptidases that belong to MEROPS peptidase family C16 and are required for proteolytic processing of the replicase polyprotein. All coronaviruses encode between one and two accessory cysteine proteinases that recognize and process one or two sites in the amino-terminal half of the replicase polyprotein during assembly of the viral replication complex. HCoV and TGEV encode two accessory proteinases, called coronavirus papain-like proteinase 1 and 2 (PL1-PRO and PL2-PRO). IBV and SARS encodes only one called PL-PRO. The structure of this protein has shown it adopts a fold similar that of de-ubiquitinating enzymes. The peptidase family C16 domain is about 260 amino acids in length. This domain is predicted to have an alpha-beta structural organization known as the papain-like fold. It consists of three alpha-helices and three strands of antiparallel beta-sheet. Pssm-ID: 430171 Cd Length: 318 Bit Score: 146.67 E-value: 6.92e-38
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| betaCoV_Nsp7 | cd21827 | betacoronavirus non-structural protein 7; This model represents the non-structural protein 7 ... |
3925-4013 | 1.22e-36 | |||||||||
betacoronavirus non-structural protein 7; This model represents the non-structural protein 7 (Nsp7) of betacoronaviruses including the highly pathogenic Severe acute respiratory syndrome-related coronavirus (SARS-CoV), SARS-CoV2 (also called 2019 novel CoV or 2019-nCoV), and Middle East respiratory syndrome-related (MERS) CoV. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. Upon processing of the Nsp7-10 region by protease M (Mpro), the released four small proteins Nsp7, Nsp8, Nsp9 and Nsp10 form functional complexes with CoV core enzymes and stimulate replication. Most importantly, a complex of Nsp7 with Nsp8 has been shown to activate and confer processivity to the RNA-synthesizing activity of Nsp12, the RNA-dependent RNA-polymerase (RdRp); in SARS-CoV, point mutations in the NSP7- or NSP8-coding region have been shown to delay virus growth. Nsp7 and Nsp8 cooperate in activating the primer-dependent activity of the Nsp12 RdRp such that the level of their association may constitute a limiting factor for obtaining a high RNA polymerase activity. The subsequent Nsp7/Nsp8/Nsp12 polymerase complex is then able to associate with an active bifunctional Nsp14, which includes N-terminal 3' to 5' exoribonuclease (ExoN) and C-terminal N7-guanine cap methyltransferase (N7-MTase) activities, thus representing a unique coronavirus Nsp assembly that incorporates RdRp, exoribonuclease, and N7-MTase activities. Interaction of Nsp7 with Nsp8 appears to be conserved across the coronavirus family, making these proteins interesting drug targets. Nsp7 has a 4-helical bundle conformation which is strongly affected by its interaction with Nsp8, especially where it concerns alpha-helix 4. SARS-CoV Nsp7 forms a 8:8 hexadecameric supercomplex with Nsp8 that adopts a hollow cylinder-like structure with a large central channel and positive electrostatic properties in the cylinder; the Nsp7/Nsp8 complex functions as a noncanonical RNA polymerase capable of synthesizing RNA of up to template length. Pssm-ID: 409253 Cd Length: 83 Bit Score: 134.49 E-value: 1.22e-36
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| CoV_NSP7 | pfam08716 | Coronavirus replicase NSP7; NSP7 (non structural protein 7) has been implicated in viral RNA ... |
3925-4013 | 1.43e-36 | |||||||||
Coronavirus replicase NSP7; NSP7 (non structural protein 7) has been implicated in viral RNA replication and is predominantly alpha helical in structure. It forms a hexadecameric supercomplex with NSP8 that adopts a hollow cylinder-like structure. The dimensions of the central channel and positive electrostatic properties of the cylinder imply that it confers processivity on RNA-dependent RNA polymerase. NSP7 and NSP8 heterodimers play a role in the stabilization of NSP12 regions involved in RNA binding and are essential for a highly active NSP12 polymerase complex. Pssm-ID: 285878 Cd Length: 83 Bit Score: 134.50 E-value: 1.43e-36
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| Ubl1_cv_Nsp3_N-like | cd21467 | first ubiquitin-like (Ubl) domain located at the N-terminus of coronavirus SARS-CoV ... |
852-941 | 4.99e-36 | |||||||||
first ubiquitin-like (Ubl) domain located at the N-terminus of coronavirus SARS-CoV non-structural protein 3 (Nsp3) and related proteins; This ubiquitin-like (Ubl) domain (Ubl1) is found at the N-terminus of coronavirus Nsp3, a large multi-functional multi-domain protein which is an essential component of the replication/transcription complex (RTC). The functions of Ubl1 in CoVs are related to single-stranded RNA (ssRNA) binding and to interacting with the nucleocapsid (N) protein. SARS-CoV Ubl1 has been shown to bind ssRNA having AUA patterns, and since the 5'-UTR of the SARS-CoV genome has a number of AUA repeats, it may bind there. In mouse hepatitis virus (MHV), this Ubl1 domain binds the cognate N protein. Adjacent to Ubl1 is a Glu-rich acidic region (also referred to as hypervariable region, HVR); Ubl1 together with HVR has been called Nsp3a. Currently, the function of HVR in CoVs is unknown. This model corresponds to one of two Ubl domains in Nsp3; the other is located N-terminal to the papain-like protease (PLpro) and is not represented by this model. Pssm-ID: 394822 Cd Length: 89 Bit Score: 133.08 E-value: 4.99e-36
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| CoV_Nsp9 | cd21881 | coronavirus non-structural protein 9; This model represents the non-structural protein 9 (Nsp9) ... |
4211-4320 | 5.46e-34 | |||||||||
coronavirus non-structural protein 9; This model represents the non-structural protein 9 (Nsp9) from coronaviruses, including highly pathogenic betacoronaviruses such as Severe acute respiratory syndrome-related coronavirus (SARS-CoV), SARS-CoV2 (also called 2019 novel CoV or 2019-nCoV), and Middle East respiratory syndrome-related (MERS) CoV. CoVs utilize a multi-subunit replication/transcription machinery assembled from a set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins. All of these Nsps, except for Nsp1 and Nsp2, are considered essential for transcription, replication, and translation of the viral RNA. Nsp9, with Nsp7, Nsp8, and Nsp10, localizes within the replication complex. Nsp9 is an essential single-stranded RNA-binding protein for CoV replication; it shares structural similarity to the oligosaccharide-binding (OB) fold, which is characteristic of proteins that bind to ssDNA or ssRNA. Nsp9 requires dimerization for binding and orienting RNA for subsequent use by the replicase machinery. CoV Nsp9s have diverse forms of dimerization that promote their biological function, which may help elucidate the mechanism underlying CoVs replication and contribute to the development of antiviral drugs. Generally, dimers are formed via interaction of the parallel alpha-helices containing the protein-protein interaction motif GXXXG at the C-terminus; additionally, the N-finger region may also play a critical role in dimerization as seen in porcine delta coronavirus (PDCoV) Nsp9. As a member of the replication complex, Nsp9 may not have a specific RNA-binding sequence but may act in conjunction with other Nsps as a processivity factor, as shown by mutation studies indicating that Nsp9 is a key ingredient that intimately engages other proteins in the replicase complex to mediate efficient virus transcription and replication. Pssm-ID: 409329 Cd Length: 111 Bit Score: 128.02 E-value: 5.46e-34
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| deltaCoV-Nsp6 | cd21561 | deltacoronavirus non-structural protein 6; Coronaviruses (CoV) redirect and rearrange host ... |
3619-3924 | 4.32e-33 | |||||||||
deltacoronavirus non-structural protein 6; Coronaviruses (CoV) redirect and rearrange host cell membranes as part of the viral genome replication and transcription machinery; they induce the formation of double-membrane vesicles in infected cells. CoV non-structural protein 6 (Nsp6), a transmembrane-containing protein, together with Nsp3 and Nsp4, have the ability to induce double-membrane vesicles that are similar to those observed in severe acute respiratory syndrome (SARS) coronavirus-infected cells. By itself, Nsp6 can generate autophagosomes from the endoplasmic reticulum. Autophagosomes are normally generated as a cellular response to starvation to carry cellular organelles and long-lived proteins to lysosomes for degradation. Degradation through autophagy may provide an innate defense against virus infection, or conversely, autophagosomes can promote infection by facilitating the assembly of replicase proteins. In addition to initiating autophagosome formation, Nsp6 also limits autophagosome expansion regardless of how they were induced, i.e. whether they were induced directly by Nsp6, or indirectly by starvation or chemical inhibition of MTOR signaling. This may favor coronavirus infection by compromising the ability of autophagosomes to deliver viral components to lysosomes for degradation. Pssm-ID: 394847 Cd Length: 296 Bit Score: 132.10 E-value: 4.32e-33
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| betaCoV_Nsp1 | cd21876 | non-structural protein 1 from betacoronavirus; This model represents the non-structural ... |
57-196 | 7.09e-33 | |||||||||
non-structural protein 1 from betacoronavirus; This model represents the non-structural protein 1 (Nsp1) from betacoronaviruses, including highly pathogenic coronaviruses such as Severe acute respiratory syndrome-related coronavirus (SARS-CoV), SARS-CoV2 (also called 2019 novel CoV or 2019-nCoV), and Middle East respiratory syndrome-related (MERS) CoV. CoVs utilize a multi-subunit replication/transcription machinery assembled from a set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins. Nsp1 is the N-terminal cleavage product released from the ORF1a polyprotein by the action of papain-like protease (PLpro). Though Nsp1s of alphaCoVs and betaCoVs share structural similarity, they show no significant sequence similarity and may be considered as genus-specific markers. Despite low sequence similarity, the Nsp1s of alphaCoVs and betaCoVs exhibit remarkably similar biological functions, and are involved in the regulation of both host and viral gene expression. CoV Nsp1 induces suppression of host gene expression and interferes with host immune response. It inhibits host gene expression in two ways: by targeting the translation and stability of cellular mRNAs, and by inhibiting mRNA translation and inducing an endonucleolytic RNA cleavage in the 5'-UTR of cellular mRNAs through its tight association with the 40S ribosomal subunit, a key component of the cellular translation machinery. Inhibition of host mRNA translation includes that of type I interferons, major components of the host innate immune response. Nsp1 is critical in regulating viral replication and gene expression, as shown by multiple evidences, including: mutations in the Nsp1 coding region of the transmissible gastroenteritis virus (TGEV) and murine hepatitis virus (MHV) genomes cause drastic reduction or elimination of infectious virus; bovine coronavirus (BCoV) Nsp1 is an RNA-binding protein that interacts with cis-acting replication elements in the 5'-UTR of the BCoV genome, implying its potential role in the regulation of viral translation or replication; and SARS-CoV Nsp1 enhances virus replication by binding to a stem-loop structure in the 5'-UTR of its genome. Pssm-ID: 409338 Cd Length: 114 Bit Score: 124.83 E-value: 7.09e-33
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| TM_Y_deltaCoV_Nsp3_C | cd21711 | C-terminus of deltacoronavirus non-structural protein 3, including transmembrane and Y domains; ... |
2324-2838 | 4.33e-30 | |||||||||
C-terminus of deltacoronavirus non-structural protein 3, including transmembrane and Y domains; This model represents the C-terminus of non-structural protein 3 (Nsp3) from deltacoronavirus, including Magpie-robin coronavirus HKU18 and Bulbul coronavirus HKU11, among others. This conserved C-terminus includes two transmembrane (TM) regions TM1 and TM2, an ectodomain (3Ecto) between the TM1 and TM2 that is glycosylated and located on the lumenal side of the ER, an amphiphatic region (AH1) that is not membrane-spanning, and a large Y domain of approximately 370 residues. Nsp3 is a large multi-functional multi-domain protein that is an essential component of the replication/transcription complex (RTC), which carries out RNA synthesis, RNA processing, and interference with the host cell innate immune system. In the related betacoronaviruses, Severe acute respiratory syndrome-related coronavirus (SARS-CoV) and murine hepatitis virus (MHV), the TM1, 3Ecto and TM2 domains are important for the papain-like protease (PL2pro) domain to process Nsp3-Nsp4 cleavage. It has also been shown that the interaction of 3Ecto with the lumenal loop of Nsp4 is essential for ER rearrangements in cells infected with SARS-CoV or MHV. The Y domain, located at the cytosolic side of the ER, consists of the Y1 and CoV-Y subdomains, which are conserved in nidovirus and coronavirus, respectively. Functional information about the Y domain is limited; it has been shown that Nsp3 binding to Nsp4 is less efficient without the Y domain. Pssm-ID: 409659 Cd Length: 490 Bit Score: 127.90 E-value: 4.33e-30
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| alphaCoV_Nsp9 | cd21897 | alphacoronavirus non-structural protein 9; This model represents the non-structural protein 9 ... |
4211-4320 | 2.08e-29 | |||||||||
alphacoronavirus non-structural protein 9; This model represents the non-structural protein 9 (Nsp9) of alphacoronaviruses, including Porcine epidemic diarrhea virus (PEDV), Porcine transmissible gastroenteritis coronavirus (TGEV), and Human coronavirus 229E. CoVs utilize a multi-subunit replication/transcription machinery assembled from a set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins. All of these Nsps, except for Nsp1 and Nsp2, are considered essential for transcription, replication, and translation of the viral RNA. Nsp9, with Nsp7, Nsp8, and Nsp10, localizes within the replication complex. Nsp9 is an essential single-stranded RNA-binding protein for coronavirus replication; it shares structural similarity to the oligosaccharide-binding (OB) fold, which is characteristic of proteins that bind to ssDNA or ssRNA. Nsp9 requires dimerization for binding and orienting RNA for subsequent use by the replicase machinery. CoV Nsp9s have diverse forms of dimerization that promote their biological function, which may help elucidate the mechanism underlying CoVs replication and contribute to the development of antiviral drugs. Generally, dimers are formed via interaction of the parallel alpha-helices containing the protein-protein interaction motif GXXXG; additionally, the N-finger region may also play a critical role in dimerization as seen in porcine delta coronavirus (PDCoV) Nsp9. As a member of the replication complex, Nsp9 may not have a specific RNA-binding sequence but may act in conjunction with other Nsps as a processivity factor, as shown by mutation studies indicating that Nsp9 is a key ingredient that intimately engages other proteins in the replicase complex to mediate efficient virus transcription and replication. Pssm-ID: 409330 Cd Length: 108 Bit Score: 114.72 E-value: 2.08e-29
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| deltaCoV_Nsp8 | cd21833 | deltacoronavirus non-structural protein 8; This model represents the non-structural protein 8 ... |
4020-4179 | 1.31e-24 | |||||||||
deltacoronavirus non-structural protein 8; This model represents the non-structural protein 8 (Nsp8) region of deltacoronaviruses that include White-eye coronavirus HKU16 and Quail coronavirus UAE-HKU30, among others. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. Upon processing of the Nsp7-10 region by protease M (Mpro), the released four small proteins Nsp7, Nsp8, Nsp9, and Nsp10 form functional complexes with CoV core enzymes and thereby stimulate replication. Most importantly, a complex of Nsp8 with Nsp7 has been shown to activate and confer processivity to the RNA-synthesizing activity of Nsp12, the RNA-dependent RNA-polymerase (RdRp); in SARS-CoV, point mutations in the genes encoding Nsp8 and Nsp7 have been shown to delay virus growth. Nsp8 and Nsp7 cooperate in activating the primer-dependent activity of the Nsp12 RdRp such that the level of their association may constitute a limiting factor for obtaining a high RNA polymerase activity. The subsequent Nsp7/Nsp8/Nsp12 polymerase complex is then able to associate with an active bifunctional Nsp14, which includes N-terminal 3' to 5' exoribonuclease (ExoN) and C-terminal N7-guanine cap methyltransferase (N7-MTase) activities, thus representing a unique coronavirus Nsp assembly that incorporates RdRp, exoribonuclease, and N7-MTase activities. Interaction of Nsp8 with Nsp7 appears to be conserved across the coronavirus family, making these proteins interesting drug targets. Nsp8 has a novel 'golf-club' fold composed of an N-terminal 'shaft' domain and a C-terminal 'head' domain. The shaft domain contains three helices, one of which is very long, while the head domain contains another three helices and seven beta-strands, forming an alpha/beta fold. SARS-CoV Nsp8 forms a 8:8 hexadecameric supercomplex with Nsp7 that adopts a hollow cylinder-like structure with a large central channel and positive electrostatic properties in the cylinder, while Feline infectious peritonitis virus Nsp8 forms a 1:2 heterotrimer with Nsp7. Regardless of their oligomeric structure, the Nsp7/Nsp8 complex functions as a noncanonical RNA polymerase capable of synthesizing RNA of up to the template length. Pssm-ID: 409260 Cd Length: 189 Bit Score: 104.32 E-value: 1.31e-24
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| SUD_C_DPUP_CoV_Nsp3 | cd21513 | C-terminal SARS-Unique Domain (SUD) of betacoronavirus non-structural protein 3 (Nsp3); This ... |
1539-1610 | 1.89e-24 | |||||||||
C-terminal SARS-Unique Domain (SUD) of betacoronavirus non-structural protein 3 (Nsp3); This family contains the SUD-C of Nsp3 from Severe Acute Respiratory Syndrome (SARS) coronavirus (CoV), Middle East respiratory syndrome-related (MERS) CoV, and Rousettus bat CoV HKU9, as well as the DPUP (domain preceding Ubl2 and PLP2) of murine hepatitis virus (MHV) Nsp3. Though structurally similar, there is little sequence similarity between these four domain subfamilies: SARS SUD-C, MERS SUD-C, HKU9 SUD-C, and MHV DPUP. Non-structural protein 3 (Nsp3) is a large multi-functional multi-domain protein that is an essential component of the replication/transcription complex (RTC), which carries out RNA synthesis, RNA processing, and interference with the host cell innate immune system. Nsp3 of SARS coronavirus includes a SARS-unique domain (SUD) consisting of three globular domains separated by short linker peptide segments: SUD-N, SUD-M, and SUD-C. SUD-N and SUD-M are macro domains which bind G-quadruplexes (unusual nucleic-acid structures formed by consecutive guanosine nucleotides). The SUD-C domain adopts a frataxin-like fold and has structural similarity to DNA-binding domains of DNA-modifying enzymes. It binds to single-stranded RNA and recognizes purine bases more strongly than pyrimidine bases. SUD-C also regulates the RNA binding behavior of the SUD-M macrodomain. SUD-C is not as specific to SARS CoV Nsp3 as originally thought, and is conserved in the Nsp3s of all four lineages (A-D) of betacoronavirus. Pssm-ID: 394838 Cd Length: 71 Bit Score: 99.17 E-value: 1.89e-24
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| gammaCoV_Nsp9 | cd21899 | gammacoronavirus non-structural protein 9; This model represents the non-structural protein 9 ... |
4209-4320 | 9.70e-24 | |||||||||
gammacoronavirus non-structural protein 9; This model represents the non-structural protein 9 (Nsp9) from gammacoronaviruses such as Avian infectious bronchitis virus (IBV). CoVs utilize a multi-subunit replication/transcription machinery assembled from a set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins. All of these Nsps, except for Nsp1 and Nsp2, are considered essential for transcription, replication, and translation of the viral RNA. Nsp9, with Nsp7, Nsp8, and Nsp10, localizes within the replication complex. Nsp9 is an essential single-stranded RNA-binding protein for coronavirus replication; it shares structural similarity to the oligosaccharide-binding (OB) fold, which is characteristic of proteins that bind to ssDNA or ssRNA. Nsp9 requires dimerization for binding and orienting RNA for subsequent use by the replicase machinery. CoV Nsp9s have diverse forms of dimerization that promote their biological function, which may help elucidate the mechanism underlying CoVs replication and contribute to the development of antiviral drugs. Generally, dimers are formed via interaction of the parallel alpha-helices containing the protein-protein interaction motif GXXXG; additionally, the N-finger region may also play a critical role in dimerization as seen in porcine delta coronavirus (PDCoV) Nsp9. As a member of the replication complex, Nsp9 may not have a specific RNA-binding sequence but may act in conjunction with other Nsps as a processivity factor, as shown by mutation studies indicating that Nsp9 is a key ingredient that intimately engages other proteins in the replicase complex to mediate efficient virus transcription and replication. Pssm-ID: 409332 Cd Length: 113 Bit Score: 98.77 E-value: 9.70e-24
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| TM_Y_gammaCoV_Nsp3_C | cd21710 | C-terminus of gammacoronavirus non-structural protein 3, including transmembrane and Y domains; ... |
2353-2771 | 2.92e-23 | |||||||||
C-terminus of gammacoronavirus non-structural protein 3, including transmembrane and Y domains; This model represents the C-terminus of non-structural protein 3 (Nsp3) from gammacoronavirus, including Infectious bronchitis virus. This conserved C-terminus includes two transmembrane (TM) regions TM1 and TM2, an ectodomain (3Ecto) between the TM1 and TM2 that is glycosylated and located on the lumenal side of the ER, an amphiphatic region (AH1) that is not membrane-spanning, and a large Y domain of approximately 370 residues. Nsp3 is a large multi-functional multi-domain protein that is an essential component of the replication/transcription complex (RTC), which carries out RNA synthesis, RNA processing, and interference with the host cell innate immune system. In the related betacoronaviruses, Severe acute respiratory syndrome-related coronavirus (SARS-CoV) and murine hepatitis virus (MHV), the TM1, 3Ecto and TM2 domains are important for the papain-like protease (PL2pro) domain to process Nsp3-Nsp4 cleavage. It has also been shown that the interaction of 3Ecto with the lumenal loop of Nsp4 is essential for ER rearrangements in cells infected with SARS-CoV or MHV. The Y domain, located at the cytosolic side of the ER, consists of the Y1 and CoV-Y subdomains, which are conserved in nidovirus and coronavirus, respectively. Functional information about the Y domain is limited; it has been shown that Nsp3 binding to Nsp4 is less efficient without the Y domain. Pssm-ID: 409658 Cd Length: 525 Bit Score: 107.53 E-value: 2.92e-23
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| Macro_X_Nsp3-like | cd21557 | X-domain (or Mac1 domain) of viral non-structural protein 3 and related macrodomains; The ... |
1343-1467 | 5.91e-23 | |||||||||
X-domain (or Mac1 domain) of viral non-structural protein 3 and related macrodomains; The X-domain, also called Mac1, is the macrodomain found in riboviral non-structural protein 3 (Nsp3), including the Nsp3 of Severe Acute Respiratory Syndrome Coronavirus (SARS-CoV) as well as SARS-CoV-2, and other coronaviruses (alpha-, beta-, gamma-, and deltacoronavirus), among others. The SARS-CoV-2 Nsp3 Mac1 is highly conserved among all CoVs, and binds to and hydrolyzes mono-ADP-ribose (MAR) from target proteins. It appears to counter host-mediated antiviral ADP-ribosylation, a post-translational modification that is part of the host response to viral infections. Mac1 is essential for pathogenesis in multiple animal models of CoV infection, implicating it as a virulence factor and potential therapeutic target. Assays show that the de-MARylating activity leads to a rapid loss of substrate, and that Mac1 could not hydrolyze poly-ADP-ribose; thus, Mac1 is a MAR-hydrolase (mono-ADP ribosylhydrolase). Mac1 was originally named ADP-ribose-1"-phosphatase (ADRP) based on data demonstrating that it could remove the phosphate group from ADP-ribose-1"-phosphate; however, activity was modest and was unclear why this would impact a virus infection. This family also includes the X-domain of Avian infectious bronchitis virus (IBV) strain Beaudette coronavirus that does not bind ADP-ribose; the triple glycine sequence found in the X-domains of SARS-CoV and human coronavirus 229E (HCoV229E), which are involved in ADP-ribose binding, is not conserved in the IBV X-domain. SARS-CoVs have two other macrodomains referred to as the SUD-N (N-terminal subdomain, or Mac2) and SUD-M (middle SUD subdomain, or Mac3) of the SARS-unique domain (SUD), which also do not bind ADP-ribose; these bind G-quadruplexes (unusual nucleic-acid structures formed by consecutive guanosine nucleotides). SARS-CoV SUD-N and SUD-M are not included in this group. Pssm-ID: 438957 Cd Length: 127 Bit Score: 97.24 E-value: 5.91e-23
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| gammaCoV_PLPro | cd21733 | gammacoronavirus papain-like protease; This model represents the papain-like protease (PLPro) ... |
1618-1876 | 1.00e-22 | |||||||||
gammacoronavirus papain-like protease; This model represents the papain-like protease (PLPro) found in non-structural protein 3 (Nsp3) of gammacoronavirus, including Avian coronavirus, Canada goose coronavirus, and Beluga whale coronavirus SW1. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. PLPro is a key enzyme in this process, making it a high value target for the development of anti-coronavirus therapeutics. PLPro, which belongs to the MEROPS peptidase C16 family, participates in the proteolytic processing of the N-terminal region of the replicase polyprotein; it can cleave Nsp1|Nsp2, Nsp2|Nsp3, and Nsp3|Nsp4 sites and its activity is dependent on zinc. Besides cleaving the polyproteins, PLPro also possesses a related enzymatic activity to promote virus replication: deubiquitinating (DUB) and de-ISGylating activities. Both, ubiquitin (Ub) and Ub-like interferon-stimulated gene product 15 (ISG15), are involved in preventing viral infection; coronaviruses utilize Ubl-conjugating pathways to counter the pro-inflammatory properties of Ubl-conjugated host proteins via the action of PLPro, which processes both 'Lys-48'- and 'Lys-63'-linked polyubiquitin chains from cellular substrates. The Nsp3 PLPro domain in several CoVs has also been shown to antagonize host innate immune induction of type I interferon by interacting with IRF3 and blocking its activation. Pssm-ID: 409650 Cd Length: 304 Bit Score: 102.12 E-value: 1.00e-22
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| gammaCoV-Nsp6 | cd21559 | gammacoronavirus non-structural protein 6; Coronaviruses (CoV) redirect and rearrange host ... |
3627-3924 | 1.09e-22 | |||||||||
gammacoronavirus non-structural protein 6; Coronaviruses (CoV) redirect and rearrange host cell membranes as part of the viral genome replication and transcription machinery; they induce the formation of double-membrane vesicles in infected cells. CoV non-structural protein 6 (Nsp6), a transmembrane-containing protein, together with Nsp3 and Nsp4, have the ability to induce double-membrane vesicles that are similar to those observed in severe acute respiratory syndrome (SARS) coronavirus-infected cells. By itself, Nsp6 can generate autophagosomes from the endoplasmic reticulum. Autophagosomes are normally generated as a cellular response to starvation to carry cellular organelles and long-lived proteins to lysosomes for degradation. Degradation through autophagy may provide an innate defense against virus infection, or conversely, autophagosomes can promote infection by facilitating the assembly of replicase proteins. In addition to initiating autophagosome formation, Nsp6 also limits autophagosome expansion regardless of how they were induced, i.e. whether they were induced directly by Nsp6, or indirectly by starvation or chemical inhibition of MTOR signaling. This may favor coronavirus infection by compromising the ability of autophagosomes to deliver viral components to lysosomes for degradation. Pssm-ID: 394845 Cd Length: 307 Bit Score: 102.15 E-value: 1.09e-22
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| CoV_NSP2_C | pfam19212 | Coronavirus replicase NSP2, C-terminal; This entry corresponds to a presumed domain found at ... |
671-832 | 5.01e-21 | |||||||||
Coronavirus replicase NSP2, C-terminal; This entry corresponds to a presumed domain found at the C-terminus of Coronavirus non-structural protein 2 (NSP2). NSP2 is encoded by ORF1a/1ab and proteolytically released from the pp1a/1ab polyprotein. The function of NSP2 is uncertain. This presumed domain is found in two copies in some viral NSP2 proteins. This domain is found in both alpha and betacoronaviruses. Pssm-ID: 465996 Cd Length: 156 Bit Score: 92.71 E-value: 5.01e-21
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| B-CoV_A_NSP1 | pfam11963 | Betacoronavirus, lineage A, NSP1; This family the N-terminal region of the Betacoronavirus ... |
969-1077 | 1.58e-20 | |||||||||
Betacoronavirus, lineage A, NSP1; This family the N-terminal region of the Betacoronavirus polyprotein which contains non-structural protein 1 (Nsp1) from Betacoronavirus lineage A. This protein is important for viral replication and pathogenesis. It suppresses the host innate immune functions by inhibiting type I interferon expression and host antiviral signalling pathways. Pssm-ID: 152398 Cd Length: 355 Bit Score: 96.55 E-value: 1.58e-20
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| deltaCoV_Nsp9 | cd21900 | deltacoronavirus non-structural protein 9; This model represents the non-structural protein 9 ... |
4211-4320 | 5.29e-20 | |||||||||
deltacoronavirus non-structural protein 9; This model represents the non-structural protein 9 (Nsp9) from deltacoronaviruses such as the Porcine delta coronavirus (PDCoV) Porcine coronavirus HKU15. CoVs utilize a multi-subunit replication/transcription machinery assembled from a set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins. All of these Nsps, except for Nsp1 and Nsp2, are considered essential for transcription, replication, and translation of the viral RNA. Nsp9, with Nsp7, Nsp8, and Nsp10, localizes within the replication complex. Nsp9 is an essential single-stranded RNA-binding protein for coronavirus replication; it shares structural similarity to the oligosaccharide-binding (OB) fold, which is characteristic of proteins that bind to ssDNA or ssRNA. Nsp9 requires dimerization for binding and orienting RNA for subsequent use by the replicase machinery. CoV Nsp9s have diverse forms of dimerization that promote their biological function, which may help elucidate the mechanism underlying CoVs replication and contribute to the development of antiviral drugs. Generally, dimers are formed via interaction of the parallel alpha-helices containing the protein-protein interaction motif GXXXG; additionally, the N-finger region may also play a critical role in dimerization as seen in porcine delta coronavirus (PDCoV) Nsp9. As a member of the replication complex, Nsp9 may not have a specific RNA-binding sequence but may act in conjunction with other Nsps as a processivity factor, as shown by mutation studies indicating that Nsp9 is a key ingredient that intimately engages other proteins in the replicase complex to mediate efficient virus transcription and replication. Pssm-ID: 409333 Cd Length: 109 Bit Score: 87.87 E-value: 5.29e-20
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| alphaCoV_Nsp7 | cd21826 | alphacoronavirus non-structural protein 7; This model represents the non-structural protein 7 ... |
3925-4013 | 5.58e-20 | |||||||||
alphacoronavirus non-structural protein 7; This model represents the non-structural protein 7 (Nsp7) of alphacoronaviruses that include Feline infectious peritonitis virus (FCoV), Human coronavirus NL63 (HCoV-NL63), and Porcine transmissible gastroenteritis coronavirus (TGEV), among others. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. Upon processing of the Nsp7-10 region by protease M (Mpro), the released four small proteins Nsp7, Nsp8, Nsp9 and Nsp10 form functional complexes with CoV core enzymes and stimulate replication. Most importantly, a complex of Nsp7 with Nsp8 has been shown to activate and confer processivity to the RNA-synthesizing activity of Nsp12, the RNA-dependent RNA-polymerase (RdRp); in SARS-CoV, point mutations in the NSP7- or NSP8-coding region have been shown to delay virus growth. Nsp7 and Nsp8 cooperate in activating the primer-dependent activity of the Nsp12 RdRp such that the level of their association may constitute a limiting factor for obtaining a high RNA polymerase activity. The subsequent Nsp7/Nsp8/Nsp12 polymerase complex is then able to associate with an active bifunctional Nsp14, which includes N-terminal 3' to 5' exoribonuclease (ExoN) and C-terminal N7-guanine cap methyltransferase (N7-MTase) activities, thus representing a unique coronavirus Nsp assembly that incorporates RdRp, exoribonuclease, and N7-MTase activities. Interaction of Nsp7 with Nsp8 appears to be conserved across the coronavirus family, making these proteins interesting drug targets. Nsp7 has a 4-helical bundle conformation which is strongly affected by its interaction with Nsp8, especially where it concerns alpha-helix 4. FCoV Nsp7 forms a 2:1 heterotrimer with Nsp8; the Nsp7/Nsp8 complex functions as a noncanonical RNA polymerase capable of synthesizing RNA of up to template length. Pssm-ID: 409252 Cd Length: 83 Bit Score: 87.04 E-value: 5.58e-20
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| A1pp | smart00506 | Appr-1"-p processing enzyme; Function determined by Martzen et al. Extended family detected by ... |
1325-1455 | 1.30e-17 | |||||||||
Appr-1"-p processing enzyme; Function determined by Martzen et al. Extended family detected by reciprocal PSI-BLAST searches (unpublished results, and Pehrson _ Fuji). Pssm-ID: 214701 Cd Length: 133 Bit Score: 81.97 E-value: 1.30e-17
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| CoV_Nsp7 | cd21811 | coronavirus non-structural protein 7; This model represents the non-structural protein 7 (Nsp7) ... |
3925-4013 | 1.33e-17 | |||||||||
coronavirus non-structural protein 7; This model represents the non-structural protein 7 (Nsp7) of alpha-, beta-, gamma- and deltacoronaviruses, including highly pathogenic betacoronaviruses such as Severe acute respiratory syndrome-related coronavirus (SARS-CoV), SARS-CoV2 (also called 2019 novel CoV or 2019-nCoV), and Middle East respiratory syndrome-related (MERS) CoV. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. Upon processing of the Nsp7-10 region by protease M (Mpro), the released four small proteins Nsp7, Nsp8, Nsp9 and Nsp10 form functional complexes with CoV core enzymes and stimulate replication. Most importantly, a complex of Nsp7 with Nsp8 has been shown to activate and confer processivity to the RNA-synthesizing activity of Nsp12, the RNA-dependent RNA-polymerase (RdRp); in SARS-CoV, point mutations in the NSP7- or NSP8-coding region have been shown to delay virus growth. Nsp7 and Nsp8 cooperate in activating the primer-dependent activity of the Nsp12 RdRp such that the level of their association may constitute a limiting factor for obtaining a high RNA polymerase activity. The subsequent Nsp7/Nsp8/Nsp12 polymerase complex is then able to associate with an active bifunctional Nsp14, which includes N-terminal 3' to 5' exoribonuclease (ExoN) and C-terminal N7-guanine cap methyltransferase (N7-MTase) activities, thus representing a unique coronavirus Nsp assembly that incorporates RdRp, exoribonuclease, and N7-MTase activities. Interaction of Nsp7 with Nsp8 appears to be conserved across the coronavirus family, making these proteins interesting drug targets. Nsp7 has a 4-helical bundle conformation which is strongly affected by its interaction with Nsp8, especially where it concerns alpha-helix 4. SARS-CoV Nsp7 forms a 8:8 hexadecameric supercomplex with Nsp8 that adopts a hollow cylinder-like structure with a large central channel and positive electrostatic properties in the cylinder, while Feline infectious peritonitis virus Nsp7 forms a 2:1 heterotrimer with Nsp8. Regardless of their oligomeric structure, the Nsp7/Nsp8 complex functions as a noncanonical RNA polymerase capable of synthesizing RNA of up to template length. Pssm-ID: 409251 Cd Length: 83 Bit Score: 80.22 E-value: 1.33e-17
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| gammaCoV_Nsp7 | cd21828 | gammacoronavirus non-structural protein 7; This model represents the non-structural protein 7 ... |
3925-4013 | 1.89e-15 | |||||||||
gammacoronavirus non-structural protein 7; This model represents the non-structural protein 7 (Nsp7) of gammacoronaviruses that include Avian infectious bronchitis virus (IBV) and Canada goose coronavirus (CGCoV), among others. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. Upon processing of the Nsp7-10 region by protease M (Mpro), the released four small proteins Nsp7, Nsp8, Nsp9 and Nsp10 form functional complexes with CoV core enzymes and stimulate replication. Most importantly, a complex of Nsp7 with Nsp8 has been shown to activate and confer processivity to the RNA-synthesizing activity of Nsp12, the RNA-dependent RNA-polymerase (RdRp); in SARS-CoV, point mutations in the NSP7- or NSP8-coding region have been shown to delay virus growth. Nsp7 and Nsp8 cooperate in activating the primer-dependent activity of the Nsp12 RdRp such that the level of their association may constitute a limiting factor for obtaining a high RNA polymerase activity. The subsequent Nsp7/Nsp8/Nsp12 polymerase complex is then able to associate with an active bifunctional Nsp14, which includes N-terminal 3' to 5' exoribonuclease (ExoN) and C-terminal N7-guanine cap methyltransferase (N7-MTase) activities, thus representing a unique coronavirus Nsp assembly that incorporates RdRp, exoribonuclease, and N7-MTase activities. Interaction of Nsp7 with Nsp8 appears to be conserved across the coronavirus family, making these proteins interesting drug targets. Nsp7 has a 4-helical bundle conformation which is strongly affected by its interaction with Nsp8, especially where it concerns alpha-helix 4. SARS-CoV Nsp7 forms a 8:8 hexadecameric supercomplex with Nsp8 that adopts a hollow cylinder-like structure with a large central channel and positive electrostatic properties in the cylinder, while Feline infectious peritonitis virus Nsp7 forms a 2:1 heterotrimer with Nsp8. Regardless of their oligomeric structure, the Nsp7/Nsp8 complex functions as a noncanonical RNA polymerase capable of synthesizing RNA of up to template length. Pssm-ID: 409254 Cd Length: 83 Bit Score: 74.06 E-value: 1.89e-15
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| Macro | pfam01661 | Macro domain; The Macro or A1pp domain is a module of about 180 amino acids which can bind ... |
1346-1449 | 2.49e-10 | |||||||||
Macro domain; The Macro or A1pp domain is a module of about 180 amino acids which can bind ADP-ribose (an NAD metabolite) or related ligands. Binding to ADP-ribose could be either covalent or non-covalent: in certain cases it is believed to bind non-covalently; while in other cases (such as Aprataxin) it appears to bind both non-covalently through a zinc finger motif, and covalently through a separate region of the protein. This domain is found in a number of otherwise unrelated proteins. It is found at the C-terminus of the macro-H2A histone protein 4 and also in the non-structural proteins of several types of ssRNA viruses such as NSP3 from alpha-viruses and coronaviruses. This domain is also found on its own in a family of proteins from bacteria, archaebacteria and eukaryotes. The 3D structure of the SARS-CoV Macro domain has a mixed alpha/beta fold consisting of a central seven-stranded twisted mixed beta sheet sandwiched between two alpha helices on one face, and three on the other. The final alpha-helix, located on the edge of the central beta-sheet, forms the C terminus of the protein. The crystal structure of AF1521 (a Macro domain-only protein from Archaeoglobus fulgidus) has also been reported and compared with other Macro domain containing proteins. Several Macro domain only proteins are shorter than AF1521, and appear to lack either the first strand of the beta-sheet or the C-terminal helix 5. Well conserved residues form a hydrophobic cleft and cluster around the AF1521-ADP-ribose binding site. Pssm-ID: 460286 Cd Length: 116 Bit Score: 60.66 E-value: 2.49e-10
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| alphaCoV_PLPro | cd21731 | alphacoronavirus papain-like protease; This model represents the papain-like protease (PLPro) ... |
1613-1758 | 9.66e-10 | |||||||||
alphacoronavirus papain-like protease; This model represents the papain-like protease (PLPro) found in non-structural protein 3 (Nsp3) of alphacoronavirus, including Swine acute diarrhea syndrome coronavirus (SADS-CoV) which causes severe diarrhea in piglets, and Human coronavirus 229E which infects humans and bats and causes the common cold. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. PLPro is a key enzyme in this process, making it a high value target for the development of anti-coronavirus therapeutics. PLPro, which belongs to the MEROPS peptidase C16 family, participates in the proteolytic processing of the N-terminal region of the replicase polyprotein; it can cleave Nsp1|Nsp2, Nsp2|Nsp3, and Nsp3|Nsp4 sites and its activity is dependent on zinc. Besides cleaving the polyproteins, PLPro also possesses a related enzymatic activity to promote virus replication: deubiquitinating (DUB) and de-ISGylating activities. Both, ubiquitin (Ub) and Ub-like interferon-stimulated gene product 15 (ISG15), are involved in preventing viral infection; coronaviruses utilize Ubl-conjugating pathways to counter the pro-inflammatory properties of Ubl-conjugated host proteins via the action of PLPro, which processes both 'Lys-48'- and 'Lys-63'-linked polyubiquitin chains from cellular substrates. The Nsp3 PLPro domain in SADS-CoV and many others has also been shown to antagonize host innate immune induction of type I interferon by interacting with IRF3 and blocking its activation. Pssm-ID: 409648 Cd Length: 289 Bit Score: 63.02 E-value: 9.66e-10
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| Macro_Af1521_BAL-like | cd02907 | macrodomain, Af1521-like family; Macrodomains are found in a variety of proteins with diverse ... |
1325-1450 | 2.73e-08 | |||||||||
macrodomain, Af1521-like family; Macrodomains are found in a variety of proteins with diverse cellular functions, as a stand-alone domain or in combination with other domains like in histone macroH2A and some PARPs (poly ADP-ribose polymerases). Macrodomains can recognize ADP-ribose (ADPr) in both its free and protein-linked forms, in related ligands, such as O-acyl-ADP-ribose (OAADPr), and even in ligands unrelated to ADPr. The macrodomains in this family show similarity to Af1521, a protein from Archaeoglobus fulgidus containing a stand-alone macrodomain. Af1521 binds ADP-ribose and exhibits phosphatase activity toward ADP-ribose-1"-monophosphate (Appr-1"-p). Also included in this family are the N-terminal (or first) macrodomains of BAL (B-aggressive lymphoma) proteins which contain multiple macrodomains, such as the first macrodomain of mono-ADP-ribosyltransferase PARP14 (PARP-14, also known as ADP-ribosyltransferase diphtheria toxin-like 8, ATRD8, B aggressive lymphoma protein 2, or BAL2). Most BAL proteins also contain a C-terminal PARP active site and are also named as PARPs. Human BAL1 (or PARP-9) was originally identified as a risk-related gene in diffuse large B-cell lymphoma that promotes malignant B-cell migration. Some BAL family proteins exhibit PARP activity. Poly (ADP-ribosyl)ation is an immediate DNA-damage-dependent post-translational modification of histones and other nuclear proteins. BAL proteins may also function as transcriptional repressors. Pssm-ID: 394877 [Multi-domain] Cd Length: 158 Bit Score: 55.96 E-value: 2.73e-08
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| MERS-CoV-like_Nsp3_NAB | cd21823 | nucleic acid binding domain of non-structural protein 3 from Middle East respiratory ... |
1946-2063 | 3.75e-07 | |||||||||
nucleic acid binding domain of non-structural protein 3 from Middle East respiratory syndrome-related coronavirus and betacoronavirus in the C lineage; This model represents the nucleic acid binding (NAB) domain of non-structural protein 3 (Nsp3) from betacoronavirus in the merbecovirus subgenus (C lineage), including Middle East respiratory syndrome-related coronavirus (MERS-CoV) and Tylonycteris bat coronavirus HKU4. The NAB domain represents a new fold, with a parallel four-strand beta-sheet holding two alpha-helices of three and four turns that are oriented antiparallel to the beta-strands. NAB is a cytoplasmic domain located between the papain-like protease (PLPro) and betacoronavirus-specific marker (betaSM) domains of CoV Nsp3. Nsp3 is a large multi-functional multi-domain protein that is an essential component of the replication/transcription complex (RTC), which carries out RNA synthesis, RNA processing, and interference with the host cell innate immune system. The NAB domain both binds ssRNA and unwinds dsDNA. It prefers to bind ssRNA containing repeats of three consecutive guanines. A group of residues that form a positively charged patch on the protein surface of SARS-CoV Nsp3 NAB serves as the binding site of nucleic acids. This site is conserved in the NAB of Nsp3 from betacoronavirus in the sarbecovirus subgenus (B lineage), and appears to be partially conserved in the Nsp3 NAB from betacoronaviruses in the C lineage. Pssm-ID: 409349 Cd Length: 123 Bit Score: 51.67 E-value: 3.75e-07
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| YmdB | COG2110 | O-acetyl-ADP-ribose deacetylase (regulator of RNase III), contains Macro domain [Translation, ... |
1326-1478 | 8.12e-06 | |||||||||
O-acetyl-ADP-ribose deacetylase (regulator of RNase III), contains Macro domain [Translation, ribosomal structure and biogenesis]; Pssm-ID: 441713 Cd Length: 168 Bit Score: 49.02 E-value: 8.12e-06
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| deltaCoV_PLPro | cd21734 | deltacoronavirus papain-like protease; This model represents the papain-like protease (PLPro) ... |
1688-1760 | 3.29e-05 | |||||||||
deltacoronavirus papain-like protease; This model represents the papain-like protease (PLPro) found in the non-structural protein 3 (Nsp3) region of deltacoronavirus, including Porcine deltacoronavirus, Bulbul coronavirus HKU11, and Common moorhen coronavirus HKU21. CoVs utilize a multi-subunit replication/transcription machinery. A set of non-structural proteins (Nsps) generated as cleavage products of the ORF1a and ORF1ab viral polyproteins assemble to facilitate viral replication and transcription. PLPro is a key enzyme in this process, making it a high value target for the development of anti-coronavirus therapeutics. PLPro, which belongs to the MEROPS peptidase C16 family, participates in the proteolytic processing of the N-terminal region of the replicase polyprotein; it can cleave Nsp1|Nsp2, Nsp2|Nsp3, and Nsp3|Nsp4 sites and its activity is dependent on zinc. Besides cleaving the polyproteins, PLPro also possesses a related enzymatic activity to promote virus replication: deubiquitinating (DUB) and de-ISGylating activities. Both, ubiquitin (Ub) and Ub-like interferon-stimulated gene product 15 (ISG15), are involved in preventing viral infection; coronaviruses utilize Ubl-conjugating pathways to counter the pro-inflammatory properties of Ubl-conjugated host proteins via the action of PLPro, which processes both 'Lys-48'- and 'Lys-63'-linked polyubiquitin chains from cellular substrates. The Nsp3 PLPro domain in many of these CoVs has also been shown to antagonize host innate immune induction of type I interferon by interacting with IRF3 and blocking its activation. Pssm-ID: 409651 Cd Length: 313 Bit Score: 49.35 E-value: 3.29e-05
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| HKU9-like_Nsp3_NAB | cd21825 | nucleic acid binding domain of non-structural protein 3 from Rousettus bat coronavirus HKU9 ... |
1967-2063 | 2.82e-04 | |||||||||
nucleic acid binding domain of non-structural protein 3 from Rousettus bat coronavirus HKU9 and betacoronavirus in the D lineage; This model represents the nucleic acid binding (NAB) domain of non-structural protein 3 (Nsp3) from betacoronavirus in the nobecovirus subgenus (D lineage), including Rousettus bat coronavirus HKU9. The NAB domain represents a new fold, with a parallel four-strand beta-sheet holding two alpha-helices of three and four turns that are oriented antiparallel to the beta-strands. NAB is a cytoplasmic domain located between the papain-like protease (PLPro) and betacoronavirus-specific marker (betaSM) domains of CoV Nsp3. Nsp3 is a large multi-functional multi-domain protein that is an essential component of the replication/transcription complex (RTC), which carries out RNA synthesis, RNA processing, and interference with the host cell innate immune system. The NAB domain both binds ssRNA and unwinds dsDNA. It prefers to bind ssRNA containing repeats of three consecutive guanines. A group of residues that form a positively charged patch on the protein surface of SARS-CoV Nsp3 NAB serves as the binding site of nucleic acids. This site is conserved in the NAB of Nsp3 from betacoronavirus in the sarbecovirus subgenus (B lineage), but is not conserved in the Nsp3 NAB from betacoronaviruses in the D lineage. Pssm-ID: 409351 Cd Length: 117 Bit Score: 43.28 E-value: 2.82e-04
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| Macro_SF | cd02749 | macrodomain superfamily; Macrodomains are found in a variety of proteins with diverse cellular ... |
1344-1456 | 7.80e-04 | |||||||||
macrodomain superfamily; Macrodomains are found in a variety of proteins with diverse cellular functions, as a stand-alone domain or in combination with other domains like in histone macroH2A and some PARPs (poly ADP-ribose polymerases). Macrodomains can recognize ADP-ribose (ADPr) in both its free and protein-linked forms, in related ligands, such as O-acyl-ADP-ribose (OAADPr), and even in ligands unrelated to ADPr. Macrodomains include the yeast macrodomain Poa1 which is a phosphatase of ADP-ribose-1"-phosphate, a by-product of tRNA splicing. Some macrodomains have ADPr-unrelated binding partners such as the coronavirus SUD-N (N-terminal subdomain) and SUD-M (middle subdomain) of the SARS-unique domain (SUD) which bind G-quadruplexes (unusual nucleic-acid structures formed by consecutive guanosine nucleotides). Macrodomains regulate a wide variety of cellular and organismal processes, including DNA damage repair, signal transduction, and immune response. Pssm-ID: 394871 Cd Length: 121 Bit Score: 42.39 E-value: 7.80e-04
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| betaCoV_Nsp2_MERS-like | cd21517 | betacoronavirus non-structural protein 2 (Nsp2) similar to MERS-CoV Nsp2, and related proteins ... |
254-437 | 3.29e-03 | |||||||||
betacoronavirus non-structural protein 2 (Nsp2) similar to MERS-CoV Nsp2, and related proteins from betacoronaviruses in the C lineage; Coronavirus non-structural proteins (Nsps) are encoded in ORF1a and ORF1b. Post infection, the genomic RNA is released into the cytoplasm of the cell and translated into two long polyproteins (pp), pp1a and pp1ab, which are then autoproteolytically cleaved by two viral proteases Nsp3 and Nsp5 into smaller subunits. Nsp2 is one of these subunits. This subgroup includes Nsp2 from Middle East respiratory syndrome-related coronavirus (MERS-CoV) and betacoronaviruses in the merbecovirus subgenus (C lineage). It belongs to a family which includes Severe acute respiratory syndrome coronavirus (SARS-CoV) Nsp2, and Murine hepatitis virus (MHV) Nsp2 (also known as p65). The function of Nsp2 remains unclear. SARS-CoV Nsp2, rather than playing a role in viral replication, may be involved in altering the host cell environment; deletion of Nsp2 from the SARS-CoV genome results in only a modest reduction in viral titers. It has been shown to interact with two host proteins, prohibitin 1 (PHB1) and PHB2, which have been implicated in cellular functions, including cell-cycle progression, cell migration, cellular differentiation, apoptosis, and mitochondrial biogenesis. MHV Nsp2/p65, different from SARS-CoV Nsp2, may play an important role in the viral life cycle. Pssm-ID: 394868 Cd Length: 660 Bit Score: 43.57 E-value: 3.29e-03
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| Macro_OAADPr_deacetylase | cd02908 | macrodomain, O-acetyl-ADP-ribose (OAADPr) family; Macrodomains are found in a variety of ... |
1326-1478 | 6.13e-03 | |||||||||
macrodomain, O-acetyl-ADP-ribose (OAADPr) family; Macrodomains are found in a variety of proteins with diverse cellular functions, as a stand-alone domain or in combination with other domains like in histone macroH2A and some PARPs (poly ADP-ribose polymerases). Macrodomains can recognize ADP-ribose (ADPr) in both its free and protein-linked forms, in related ligands, such as O-acyl-ADP-ribose (OAADPr), and even in ligands unrelated to ADPr. This family includes eukaryotic macrodomain proteins such as human MacroD1 and MacroD2, and bacterial proteins such as Escherichia coli YmdB; these have been shown to be O-acetyl-ADP-ribose (OAADPr) deacetylases that efficiently catalyze the hydrolysis of OAADPr to produce ADP-ribose and free acetate. OAADPr is a sirtuin reaction product generated from the NAD+-dependent protein deacetylation reactions and has been implicated as a signaling molecule. By acting on mono-ADP-ribosylated substrates, OAADPr deacetylases may reverse cellular ADP-ribosylation. Pssm-ID: 438955 Cd Length: 166 Bit Score: 40.57 E-value: 6.13e-03
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