Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2B SuperfamilyPurine and uridine phosphorylases 8037965 3000626 SCOP2B (2022-06-29)
BSCOP2B SuperfamilyPurine and uridine phosphorylases 8037965 3000626 SCOP2B (2022-06-29)
CSCOP2B SuperfamilyPurine and uridine phosphorylases 8037965 3000626 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
APNP_UDP_1e4ts9A1 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)
BPNP_UDP_1e4ts9B1 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)
CPNP_UDP_1e4ts9C1 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)
B3.40.50.1580 Alpha Beta 3-Layer(aba) Sandwich Rossmann fold Nucleoside phosphorylase domainCATH (4.3.0)
C3.40.50.1580 Alpha Beta 3-Layer(aba) Sandwich Rossmann fold Nucleoside phosphorylase domainCATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
A, B, C
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
A, B, C
Purine nucleoside phosphorylase DeoD-type

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

ChainsEnzyme NameDescriptionCatalytic Residues
A, C
Purine nucleoside phosphorylase DeoD-type  M-CSA #375

Purine nucleoside phosphorylase is involved in purine metabolism, metabolising adenosine into adenine and guanosine into guanine, for example. Also works on inosine. These pathways allow the cell to produce nucleotide monophosphates when they cannot synthesise them de novo.

The enzyme catalyses the reversible phosphorolytic cleavage of the glycosidic bond of purine nucleosides with the overall reaction: beta-purine nucleoside + orthophosphate <-> purine base + alpha-D-pentose-1-phosphate

Defined by 7 residues: GLY:A-20ARG:A-24ARG:A-87SER:A-90ASP:A-204ARG:A-217ARG:C-43
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