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Conserved domains on  [gi|130980072|ref|NP_001076087|]
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myeloid cell surface antigen CD33 isoform 2 [Homo sapiens]

Protein Classification

immunoglobulin domain-containing family protein( domain architecture ID 34076)

immunoglobulin (Ig) domain-containing family protein is a member of a large superfamily containing cell surface antigen receptors, co-receptors and co-stimulatory molecules of the immune system, molecules involved in antigen presentation to lymphocytes, cell adhesion molecules, certain cytokine receptors and intracellular muscle proteins; immunoglobulin domains are typically divided into 4 main classes based on their structures and sequences: the Variable (V), Constant 1 (C1), Constant 2 (C2), and Intermediate (I) sets

Graphical summary

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List of domain hits

 Name Accession Description Interval E-value
Ig super family cl11960
Immunoglobulin domain; The members here are composed of the immunoglobulin (Ig) domain found ...
 18-103 4.35e-36

Immunoglobulin domain; The members here are composed of the immunoglobulin (Ig) domain found in the Ig superfamily. The Ig superfamily is a heterogenous group of proteins, built on a common fold comprised of a sandwich of two beta sheets. Members of this group are components of immunoglobulin, neuroglia, cell surface glycoproteins, including T-cell receptors, CD2, CD4, CD8, and membrane glycoproteins, including butyrophilin and chondroitin sulfate proteoglycan core protein. A predominant feature of most Ig domains is a disulfide bridge connecting the two beta-sheets with a tryptophan residue packed against the disulfide bond. Ig superfamily (IgSF) domains can be divided into 4 main classes based on their structures and sequences: the Variable (V), Constant 1 (C1), Constant 2 (C2), and Intermediate (I) sets. Typically, the V-set domains have A, B, E, and D strands in one sheet and A', G, F, C, C' and C" in the other. The structures in C1-set are smaller than those in the V-set; they have one beta sheet that is formed by strands A, B, E, and D and the other by strands G, F, C, and C'. Moreover, a C1-set Ig domain contains a short C' strand (three residues) and lacks A' and C" strand. Unlike other Ig domain sets, C2-set structures do not have a D strand. Like the V-set Ig domains, members of the I-set have a discontinuous A strand, but lack a C" strand.


The actual alignment was detected with superfamily member cd20987:

Pssm-ID: 472250  Cd Length: 94  Bit Score: 123.06  E-value: 4.35e-36
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 130980072  18 PKILIPGTLEPGHSKNLTCSVSWACEQGtPPIFSWLSAAPTSLGPR---------TTHSSVLIITPRPQDHGTNLTCQVK 88
Cdd:cd20987    1 PNIHVPEELEAGQEVTLTCSVPDNCPAL-SPEFSWLGAALTPLPPVlgrleeegtTTHSSVLTFTPRPEDHGTNLTCQVK 79

                         90
                 ....*....|....*
gi 130980072  89 FAGAGVTTERTIQLN 103
Cdd:cd20987   80 FPGATVTTERTIQLN 94
 
Name Accession Description Interval E-value
IgC2_CD33_d2_like cd20987
Second immunoglobulin domain of Cluster of Differentiation (CD) 33 and related Siglecs; member ...
 18-103 4.35e-36

Second immunoglobulin domain of Cluster of Differentiation (CD) 33 and related Siglecs; member of the C2-set of IgSF domains; The members here are composed of the second immunoglobulin (Ig) domain of Cluster of Differentiation (CD) 33 (also known as sialic-acid binding immunoglobulin type-lectin 3 (Siglec-3)) and related Siglecs. CD33, a Siglec family member, is a well-known immunotherapeutic target in acute myeloid leukemia (AML). It is an inhibitory sialoadhesin expressed in human leukocytes of the myeloid lineage and some lymphoid subsets, including natural killer (NK) cells. Siglecs are primarily expressed on immune cells and recognize sialic acid-containing glycan ligands. Siglecs are organized as an extracellular module composed of Ig-like domains (an N-terminal variable set of Ig-like carbohydrate recognition domains, and 1 to 16 constant Ig-like domains), followed by transmembrane and short cytoplasmic domains. Human Siglecs are classified into two subgroups, one subgroup is comprised of sialoadhesin (Siglec-1), CD22 (Siglec-2), and MAG (Siglec-4, myelin-associated glycoprotein), the other subgroup is comprised of CD33-related Siglecs which include CD33 (Siglec-3) and human Siglecs 5-11. CD33 (Siglec-3) is the smallest Siglec member. It preferentially binds to alpha2-6- and alpha2-3-sialylated glycans and strongly binds to sialylated ligands on leukemic cell lines. Ig Superfamily (IgSF) domains can be divided into 4 main classes based on their structures and sequences: the Variable (V), Constant 1 (C1), Constant 2 (C2), and Intermediate (I) sets. This group includes CD33-related Siglecs which belong to the C2-set of IgSF domains. Unlike the C1-set, the C2-set structures do not have a D strand.


Pssm-ID: 409579  Cd Length: 94  Bit Score: 123.06  E-value: 4.35e-36
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 130980072  18 PKILIPGTLEPGHSKNLTCSVSWACEQGtPPIFSWLSAAPTSLGPR---------TTHSSVLIITPRPQDHGTNLTCQVK 88
Cdd:cd20987    1 PNIHVPEELEAGQEVTLTCSVPDNCPAL-SPEFSWLGAALTPLPPVlgrleeegtTTHSSVLTFTPRPEDHGTNLTCQVK 79

                         90
                 ....*....|....*
gi 130980072  89 FAGAGVTTERTIQLN 103
Cdd:cd20987   80 FPGATVTTERTIQLN 94
ig pfam00047
Immunoglobulin domain; Members of the immunoglobulin superfamily are found in hundreds of ...
 19-100 7.45e-07

Immunoglobulin domain; Members of the immunoglobulin superfamily are found in hundreds of proteins of different functions. Examples include antibodies, the giant muscle kinase titin and receptor tyrosine kinases. Immunoglobulin-like domains may be involved in protein-protein and protein-ligand interactions.


Pssm-ID: 395002  Cd Length: 86  Bit Score: 46.03  E-value: 7.45e-07
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 130980072   19 KILIPGTLEPGHSKNLTCSVSwacEQGTPPIFSWLSAAPTSLGP--------RTTHSSVLIITPRPQDHGTnLTCQVKFA 90
Cdd:pfam00047   1 SAPPTVTVLEGDSATLTCSAS---TGSPGPDVTWSKEGGTLIESlkvkhdngRTTQSSLLISNVTKEDAGT-YTCVVNNP 76

                          90
                  ....*....|
gi 130980072   91 GAGVTTERTI 100
Cdd:pfam00047  77 GGSATLSTSL 86
 
Name Accession Description Interval E-value
IgC2_CD33_d2_like cd20987
Second immunoglobulin domain of Cluster of Differentiation (CD) 33 and related Siglecs; member ...
 18-103 4.35e-36

Second immunoglobulin domain of Cluster of Differentiation (CD) 33 and related Siglecs; member of the C2-set of IgSF domains; The members here are composed of the second immunoglobulin (Ig) domain of Cluster of Differentiation (CD) 33 (also known as sialic-acid binding immunoglobulin type-lectin 3 (Siglec-3)) and related Siglecs. CD33, a Siglec family member, is a well-known immunotherapeutic target in acute myeloid leukemia (AML). It is an inhibitory sialoadhesin expressed in human leukocytes of the myeloid lineage and some lymphoid subsets, including natural killer (NK) cells. Siglecs are primarily expressed on immune cells and recognize sialic acid-containing glycan ligands. Siglecs are organized as an extracellular module composed of Ig-like domains (an N-terminal variable set of Ig-like carbohydrate recognition domains, and 1 to 16 constant Ig-like domains), followed by transmembrane and short cytoplasmic domains. Human Siglecs are classified into two subgroups, one subgroup is comprised of sialoadhesin (Siglec-1), CD22 (Siglec-2), and MAG (Siglec-4, myelin-associated glycoprotein), the other subgroup is comprised of CD33-related Siglecs which include CD33 (Siglec-3) and human Siglecs 5-11. CD33 (Siglec-3) is the smallest Siglec member. It preferentially binds to alpha2-6- and alpha2-3-sialylated glycans and strongly binds to sialylated ligands on leukemic cell lines. Ig Superfamily (IgSF) domains can be divided into 4 main classes based on their structures and sequences: the Variable (V), Constant 1 (C1), Constant 2 (C2), and Intermediate (I) sets. This group includes CD33-related Siglecs which belong to the C2-set of IgSF domains. Unlike the C1-set, the C2-set structures do not have a D strand.


Pssm-ID: 409579  Cd Length: 94  Bit Score: 123.06  E-value: 4.35e-36
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 130980072  18 PKILIPGTLEPGHSKNLTCSVSWACEQGtPPIFSWLSAAPTSLGPR---------TTHSSVLIITPRPQDHGTNLTCQVK 88
Cdd:cd20987    1 PNIHVPEELEAGQEVTLTCSVPDNCPAL-SPEFSWLGAALTPLPPVlgrleeegtTTHSSVLTFTPRPEDHGTNLTCQVK 79

                         90
                 ....*....|....*
gi 130980072  89 FAGAGVTTERTIQLN 103
Cdd:cd20987   80 FPGATVTTERTIQLN 94
IgC1_CD22_d2 cd20938
Second immunoglobulin domain of Cluster of Differentiation (CD) 22; member of the Constant 1 ...
 18-104 2.39e-08

Second immunoglobulin domain of Cluster of Differentiation (CD) 22; member of the Constant 1 (C1)-set of IgSF domains; The members here are composed of the second immunoglobulin domain of clusters of differentiation (CD) 22 (also known as Siglec-2). CD22, a sialic-acid binding immunoglobulin type-lectin (Siglec) family member, is an inhibitory co-receptor of the B-cell receptor (BCR). The inhibitory function of CD22 and its restricted expression on B cells makes CD22 an attractive target against dysregulated B cells that cause autoimmune diseases and B-cell-derived cancers. CD22 plays a vital role in establishing a baseline level of B-cell inhibition, and thus is an important determinant of homeostasis in humoral immunity. Siglecs are primarily expressed on immune cells and recognize sialic acid-containing glycan ligands. Siglecs are organized as an extracellular module composed of Ig-like domains (an N-terminal variable set of Ig-like carbohydrate recognition domains, and 1 to 16 constant Ig-like domains), followed by transmembrane and short cytoplasmic domains. Human Siglecs are classified into two subgroups, one subgroup is comprised of sialoadhesin (Siglec-1), CD22 (Siglec-2), and MAG (Siglec-4, myelin-associated glycoprotein), the other subgroup is comprised of CD33-related Siglecs which include CD33 (Siglec-3) and human Siglecs 5-11. IgSF domains can be divided into 4 main classes based on their structures and sequences: the Variable (V), Constant 1 (C1), Constant 2 (C2), and Intermediate (I) sets. This group belongs to the C1-set of IgSF domains.


Pssm-ID: 409532  Cd Length: 98  Bit Score: 50.33  E-value: 2.39e-08
                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 130980072  18 PKILIPGTLEPGHSKNLTCSVSWACeQGTPPIFSW-LSAAPTSLGPRTTHS---------SVLIITPRPQDHGTNLTCQV 87
Cdd:cd20938    3 PHIQLPPEIQESQEVTLTCLLNFSC-YGYPIQLQWlLEGSPMRQAAVTSTSltiksvftrSELKFQPKWSHHGKIVTCQL 81

                         90
                 ....*....|....*..
gi 130980072  88 KFAGAGVTTERTIQLNV 104
Cdd:cd20938   82 QDADGKVLSEDTVQLNV 98
ig pfam00047
Immunoglobulin domain; Members of the immunoglobulin superfamily are found in hundreds of ...
 19-100 7.45e-07

Immunoglobulin domain; Members of the immunoglobulin superfamily are found in hundreds of proteins of different functions. Examples include antibodies, the giant muscle kinase titin and receptor tyrosine kinases. Immunoglobulin-like domains may be involved in protein-protein and protein-ligand interactions.


Pssm-ID: 395002  Cd Length: 86  Bit Score: 46.03  E-value: 7.45e-07
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 130980072   19 KILIPGTLEPGHSKNLTCSVSwacEQGTPPIFSWLSAAPTSLGP--------RTTHSSVLIITPRPQDHGTnLTCQVKFA 90
Cdd:pfam00047   1 SAPPTVTVLEGDSATLTCSAS---TGSPGPDVTWSKEGGTLIESlkvkhdngRTTQSSLLISNVTKEDAGT-YTCVVNNP 76

                          90
                  ....*....|
gi 130980072   91 GAGVTTERTI 100
Cdd:pfam00047  77 GGSATLSTSL 86
C2-set_2 pfam08205
CD80-like C2-set immunoglobulin domain; These domains belong to the immunoglobulin superfamily.
 18-91 2.10e-03

CD80-like C2-set immunoglobulin domain; These domains belong to the immunoglobulin superfamily.


Pssm-ID: 400489  Cd Length: 89  Bit Score: 36.24  E-value: 2.10e-03
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 130980072   18 PKILIPGTLE--PGHSKNLTCSVswaCEQGTPPIFSW------LSAAPTSLGPRT-----THSSVLIITPRPQDHGTNLT 84
Cdd:pfam08205   1 PTIEPPASLLegEGPEVVATCSS---AGGKPAPRITWyldgkpLEAAETSSEQDPesglvTVTSELKLVPSRSDHGQSLT 77


                  ....*..
gi 130980072   85 CQVKFAG 91
Cdd:pfam08205  78 CQVSYGA 84
 
Blast search parameters
Data Source: Precalculated data, version = cdd.v.3.21
Preset Options: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.
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