Bacterial Ribonuclease HII-like; This family includes mostly bacterial type 2 RNases H, with ...
21-203
3.92e-94
Bacterial Ribonuclease HII-like; This family includes mostly bacterial type 2 RNases H, with some eukaryotic members. Bacterial RNase HII has a role in primer removal based on its involvement in ribonucleotide-specific catalytic activity in the presence of RNA/DNA hybrid substrates. Several bacteria, such as Bacillus subtilis, have two different type II RNases H, RNases HII and HIII; double deletion of these leads to cellular lethality. It appears that type I and type II RNases H also have overlapping functions in cells, as over-expression of Escherichia coli RNase HII can complement an RNase HI deletion phenotype. In Leishmania mitochondria, of the four distinct RNase H genes (H1, HIIA, HIIB, HIIC), HIIC is essential for the survival of the parasite and thus can be a potential target for anti-leishmanial chemotherapy. Ribonuclease H (RNase H) is classified into two families, type I (prokaryotic RNase HI, eukaryotic RNase H1 and viral RNase H) and type II (prokaryotic RNase HII and HIII, and eukaryotic RNase H2). RNase H endonucleolytically hydrolyzes an RNA strand when it is annealed to a complementary DNA strand in the presence of divalent cations, in DNA replication and repair.
Pssm-ID: 260003 Cd Length: 177 Bit Score: 272.32 E-value: 3.92e-94
Bacterial Ribonuclease HII-like; This family includes mostly bacterial type 2 RNases H, with ...
21-203
3.92e-94
Bacterial Ribonuclease HII-like; This family includes mostly bacterial type 2 RNases H, with some eukaryotic members. Bacterial RNase HII has a role in primer removal based on its involvement in ribonucleotide-specific catalytic activity in the presence of RNA/DNA hybrid substrates. Several bacteria, such as Bacillus subtilis, have two different type II RNases H, RNases HII and HIII; double deletion of these leads to cellular lethality. It appears that type I and type II RNases H also have overlapping functions in cells, as over-expression of Escherichia coli RNase HII can complement an RNase HI deletion phenotype. In Leishmania mitochondria, of the four distinct RNase H genes (H1, HIIA, HIIB, HIIC), HIIC is essential for the survival of the parasite and thus can be a potential target for anti-leishmanial chemotherapy. Ribonuclease H (RNase H) is classified into two families, type I (prokaryotic RNase HI, eukaryotic RNase H1 and viral RNase H) and type II (prokaryotic RNase HII and HIII, and eukaryotic RNase H2). RNase H endonucleolytically hydrolyzes an RNA strand when it is annealed to a complementary DNA strand in the presence of divalent cations, in DNA replication and repair.
Pssm-ID: 260003 Cd Length: 177 Bit Score: 272.32 E-value: 3.92e-94
Archaeal Ribonuclease HII; This family includes type 2 RNases H from archaea, some of which ...
21-208
8.11e-28
Archaeal Ribonuclease HII; This family includes type 2 RNases H from archaea, some of which show broad divalent cation specificity. It is proposed that three of the four acidic residues at the active site are involved in metal binding and the fourth one is involved in the catalytic process in archaea. Most archaeal genomes contain multiple RNase H genes. Despite a lack of evidence for homology from sequence comparisons, type I and type II RNase H share a common fold and similar steric configurations of the four acidic active-site residues, suggesting identical or very similar catalytic mechanisms. It appears that type I and type II RNases H also have overlapping functions in cells, as over-expression of Escherichia coli RNase HII can complement an RNase HI deletion phenotype in E. coli. RNase H is classified into two families, type I (prokaryotic RNase HI, eukaryotic RNase H1 and viral RNase H) and type II (prokaryotic RNase HII and HIII, archaeal RNase HII and eukaryotic RNase H2/HII). RNase H endonucleolytically hydrolyzes an RNA strand when it is annealed to a complementary DNA strand in the presence of divalent cations, in DNA replication or repair.
Pssm-ID: 260001 Cd Length: 204 Bit Score: 104.17 E-value: 8.11e-28
Ribonuclease H (RNase H) type II family (prokaryotic RNase HII and HIII, and eukaryotic RNase ...
21-193
1.11e-26
Ribonuclease H (RNase H) type II family (prokaryotic RNase HII and HIII, and eukaryotic RNase H2/HII); This family contains ribonucleases HII (RNases H2) which include bacterial RNase HII and HIII, and eukaryotic and archaeal RNase H2/HII. RNase H2 cleaves RNA sequences that are part of RNA/DNA hybrids or that are incorporated into DNA, thereby preventing genomic instability and the accumulation of aberrant nucleic acid which can induce Aicardi-Goutieres syndrome, a severe autoimmune disorder in humans. Ribonuclease H (RNase H) is classified into two families, type I (prokaryotic RNase HI, eukaryotic RNase H1 and viral RNase H) and type II (prokaryotic RNase HII and HIII, and eukaryotic RNase H2/HII). RNase H endonucleolytically hydrolyzes an RNA strand when it is annealed to a complementary DNA strand in the presence of divalent cations. The enzyme can be found in bacteria, archaea, and eukaryotes. Most prokaryotic and eukaryotic genomes contain multiple RNase H genes, but no prokaryotic genome contains the combination of only RNase HI and HIII. Despite a lack of evidence for homology from sequence comparisons, type I and type II RNase H share a common fold and similar steric configurations of the four acidic active-site residues, suggesting identical or very similar catalytic mechanisms. It appears that type I and type II RNases H also have overlapping functions in cells, as over-expression of Escherichia coli RNase HII can complement an RNase HI deletion phenotype in E. coli.
Pssm-ID: 259999 Cd Length: 193 Bit Score: 101.13 E-value: 1.11e-26
Eukaryotic RNase HII; This family includes eukaryotic type 2 RNase H (RNase HII or H2) which ...
22-86
5.63e-11
Eukaryotic RNase HII; This family includes eukaryotic type 2 RNase H (RNase HII or H2) which is active during replication and is believed to play a role in the removal of Okazaki fragment primers and single ribonucleotides in DNA-DNA duplexes. Eukaryotic RNase HII (RNASEH2A) is functional when it forms a heterotrimeric complex with two other accessory proteins (RNASEH2B and RNASEH2C). It is speculated that these accessory subunits are required for correct folding of the catalytic subunit of RNase HII. Mutations in the three subunits of human RNase HII cause the severe genetic neurological disorder Aicardi-Goutieres syndrome. Ribonuclease H (RNase H) is classified into two families, type I (prokaryotic RNase HI, eukaryotic RNase H1 and viral RNase H) and type II (prokaryotic RNase HII and HIII, and eukaryotic RNase H2/HII). RNase H endonucleolytically hydrolyzes an RNA strand when it is annealed to a complementary DNA strand in the presence of divalent cations, in DNA replication and repair. The enzyme can be found in bacteria, archaea, and eukaryotes. Most prokaryotic and eukaryotic genomes contain multiple RNase H genes. Despite a lack of evidence for homology from sequence comparisons, type I and type II RNase H share a common fold and similar steric configurations of the four acidic active-site residues, suggesting identical or very similar catalytic mechanisms.
Pssm-ID: 260002 Cd Length: 221 Bit Score: 59.45 E-value: 5.63e-11
Bacterial type 2 ribonuclease, HII and HIII-like; This family includes type 2 RNases H from ...
20-116
7.63e-07
Bacterial type 2 ribonuclease, HII and HIII-like; This family includes type 2 RNases H from several bacteria, such as Bacillus subtilis, which have two different RNases, HII and HIII. RNases HIII are distinguished by having a large (70-90 residues) N-terminal extension of unknown function. In addition, the active site of RNase HIII differs from that of other RNases H; replacing the fourth residue (aspartate) of the acidic "DEDD" motif with a glutamate. Most prokaryotic and eukaryotic genomes contain multiple RNase H genes; however, no prokaryotic genomes contain the combination of both RNase HI and HIII. This mutual exclusive gene inheritance might be the result of functional redundancy of RNase HI and HIII in prokaryotes. Ribonuclease (RNase) H is classified into two families, type I (prokaryotic RNase HI, eukaryotic RNase H1 and viral RNase H) and type II (prokaryotic RNase HII and HIII, archaeal RNase HII and eukaryotic RNase H2/HII). RNase H endonucleolytically hydrolyzes an RNA strand when it is annealed to a complementary DNA strand in the presence of divalent cations, in DNA replication or repair.
Pssm-ID: 260000 Cd Length: 207 Bit Score: 47.90 E-value: 7.63e-07
Database: CDSEARCH/cdd Low complexity filter: no Composition Based Adjustment: yes E-value threshold: 0.01
References:
Wang J et al. (2023), "The conserved domain database in 2023", Nucleic Acids Res.51(D)384-8.
Lu S et al. (2020), "The conserved domain database in 2020", Nucleic Acids Res.48(D)265-8.
Marchler-Bauer A et al. (2017), "CDD/SPARCLE: functional classification of proteins via subfamily domain architectures.", Nucleic Acids Res.45(D)200-3.
of the residues that compose this conserved feature have been mapped to the query sequence.
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of your query sequence and the protein sequences used to curate the domain model,
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The thumbnail image, if present, provides an approximate view of the feature's location in 3 dimensions.
Click on the triangle for interactive 3D structure viewing options.
Functional characterization of the conserved domain architecture found on the query.
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This image shows a graphical summary of conserved domains identified on the query sequence.
The Show Concise/Full Display button at the top of the page can be used to select the desired level of detail: only top scoring hits
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Domains are color coded according to superfamilies
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Others (non-specific hits) and
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if a domain or superfamily has been annotated with functional sites (conserved features),
they are mapped to the query sequence and indicated through sets of triangles
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click on the bars or triangles to view your query sequence embedded in a multiple sequence alignment of the proteins used to develop the corresponding domain model.
The table lists conserved domains identified on the query sequence. Click on the plus sign (+) on the left to display full descriptions, alignments, and scores.
Click on the domain model's accession number to view the multiple sequence alignment of the proteins used to develop the corresponding domain model.
To view your query sequence embedded in that multiple sequence alignment, click on the colored bars in the Graphical Summary portion of the search results page,
or click on the triangles, if present, that represent functional sites (conserved features)
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Concise Display shows only the best scoring domain model, in each hit category listed below except non-specific hits, for each region on the query sequence.
(labeled illustration) Standard Display shows only the best scoring domain model from each source, in each hit category listed below for each region on the query sequence.
(labeled illustration) Full Display shows all domain models, in each hit category below, that meet or exceed the RPS-BLAST threshold for statistical significance.
(labeled illustration) Four types of hits can be shown, as available,
for each region on the query sequence:
specific hits meet or exceed a domain-specific e-value threshold
(illustrated example)
and represent a very high confidence that the query sequence belongs to the same protein family as the sequences use to create the domain model
non-specific hits
meet or exceed the RPS-BLAST threshold for statistical significance (default E-value cutoff of 0.01, or an E-value selected by user via the
advanced search options)
the domain superfamily to which the specific and non-specific hits belong
multi-domain models that were computationally detected and are likely to contain multiple single domains
Retrieve proteins that contain one or more of the domains present in the query sequence, using the Conserved Domain Architecture Retrieval Tool
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