2WML
Crystal Structure of a Mammalian Sialyltransferase
Domain Annotation: SCOP2 Classification SCOP2 Database Homepage
Domain Annotation: ECOD Classification ECOD Database Homepage
Chains | Family Name | Domain Identifier | Architecture | Possible Homology | Homology | Topology | Family | Provenance Source (Version) |
---|---|---|---|---|---|---|---|---|
A | PF00777 | e2wmlA1 | A: a/b three-layered sandwiches | X: Alpha-2,3/8-sialyltransferase CstII-related (From Topology) | H: Alpha-2,3/8-sialyltransferase CstII-related (From Topology) | T: Alpha-2,3/8-sialyltransferase CstII-related | F: PF00777 | ECOD (1.6) |
Domain Annotation: CATH CATH Database Homepage
Chain | Domain | Class | Architecture | Topology | Homology | Provenance Source (Version) |
---|---|---|---|---|---|---|
A | 3.90.1480.20 | Alpha Beta | Alpha-Beta Complex | sialyltransferase cstii, chain A | Glycosyl transferase family 29 | CATH (4.3.0) |
Protein Family Annotation Pfam Database Homepage
Chains | Accession | Name | Description | Comments | Source |
---|---|---|---|---|---|
PF00777 | Glycosyltransferase family 29 (sialyltransferase) (Glyco_transf_29) | Glycosyltransferase family 29 (sialyltransferase) | - | Family |
Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage
InterPro: Protein Family Classification InterPro Database Homepage
Chains | Accession | Name | Type |
---|---|---|---|
IPR051757 | Beta-galactoside alpha2-3 sialyltransferases | Family | |
IPR012163 | Sialyltransferase | Family | |
IPR001675 | Glycosyl transferase family 29 | Family | |
IPR038578 | GT29-like superfamiliy | Homologous Superfamily |
Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage
Chains | Enzyme Name | Description | Catalytic Residues |
---|---|---|---|
beta-galactoside alpha-2,3-sialyltransferase M-CSA #340 | Glycosyltransferase enzymes perform the sialyation of glycojonguates, molecules which have vital roles in cell recognition, adhesion and immunogenicity. The subset of sialyl-transferases (ST) catalyse the transfer of the sialic acid moiety from a cytidine-5'-monophosphate-N-acyl neuraminic acid donor to various acceptor glyco-conjuates terminating in either galactose, N-acetyl-galactosamine or another sialic acid. The enzyme annotated here, ST3Gal-I, catalyses the displacement reaction between CMP-N-acetylneuraminate and beta-D-Galactosyl-1,3-N-acetyl-alpha-D-galactosaminyl and is a member of the glycosyl transferase family 29. Bacterial sialytransferase enzymes contain a DXD domain which binds two divalent cations that are essential for catalysis. No such domain is present in the mammalian homologues, and the activity of these enzymes is found not to be dependent upon the presence of metal cofactors [PMID:19820709]. While the glycosyltransferase-catalysed reactions had been assumed to be uni-directional, the narrow difference in favourability for glycoside formation has been exploited to synthesise rare NDP-sugar products [PMID:16946071]. | Defined by 2 residues: TYR:A-224 [auth A-269]HIS:A-274 [auth A-319] | EC: 2.4.99.4 (PDB Primary Data) |