Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

ChainsDomain InfoClassFoldSuperfamilyFamilyDomainSpeciesProvenance Source (Version)
Ad1cg6a_ Alpha and beta proteins (a/b) Phosphorylase/hydrolase-like Purine and uridine phosphorylases Purine and uridine phosphorylases 5'-deoxy-5'-methylthioadenosine phosphorylase human (Homo sapiens ) [TaxId: 9606 ], SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2B SuperfamilyPurine and uridine phosphorylases 8036168 3000626 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
APNP_UDP_1e1cg6A1 A: a/b three-layered sandwichesX: Phosphorylase/hydrolase-likeH: Peptidyl-tRNA hydrolase-like (From Topology)T: Peptidyl-tRNA hydrolase-likeF: PNP_UDP_1ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A3.40.50.1580 Alpha Beta 3-Layer(aba) Sandwich Rossmann fold Nucleoside phosphorylase domainCATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
PF01048Phosphorylase superfamily (PNP_UDP_1)Phosphorylase superfamilyMembers of this family include: purine nucleoside phosphorylase (PNP) Uridine phosphorylase (UdRPase) 5'-methylthioadenosine phosphorylase (MTA phosphorylase)Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
PROTEIN (5'-DEOXY-5'-METHYLTHIOADENOSINE PHOSPHORYLASE)

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

ChainsEnzyme NameDescriptionCatalytic Residues
S-methyl-5'-thioadenosine phosphorylase  M-CSA #244

S-methyl-5'-thioadenosine phosphorylase (MTAP) catalyses the reversible phosphorylation of S-methyl-5'-thioadenosine (MTA) to adenine and 5-methylthioribose-1-phosphate. It is involved in the breakdown of MTA, a major by-product of polyamine biosynthesis. It is responsible for the first step in the methionine salvage pathway after MTA has been generated from S-adenosylmethionine. It has broad substrate specificity with 6-aminopurine nucleosides as preferred substrates. Despite being also an MTA phosphorylase, the MTAP in thermophilic Sulfolobus solfataricus only has 14% sequence homology to human MTAP.

Defined by 2 residues: ASP:A-220ASP:A-222
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