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

ChainsDomain InfoClassFoldSuperfamilyFamilyDomainSpeciesProvenance Source (Version)
Ad1rr6a_ Alpha and beta proteins (a/b) Phosphorylase/hydrolase-like Purine and uridine phosphorylases Purine and uridine phosphorylases Purine nucleoside phosphorylase, PNP 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 8039220 3000626 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
APNP_UDP_1e1rr6A1 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
Purine nucleoside phosphorylase

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

ChainsEnzyme NameDescriptionCatalytic Residues
purine-nucleoside phosphorylase  M-CSA #17

Purine-nucleoside phosphorylase (PNP) catalyses the reversible phosphorolysis of purine nucleosides to generate the corresponding purine base and ribose 1-phosphate. There are two types of this enzyme, showing reasonably high sequence similarity within families and little identity between them. Type I (of which this entry is an example) tend to be trimeric and are found mainly in mammals. Type I enzymes are specific for inosine/guanine nucleosides and have a molecular mass of around 90kDa. Type II tend to be hexameric (although some are thought to be tetramers) and have broad substrate specificity. Type II enzymes are found mainly in prokaryotes and have a molecular mass between 110 and 150 kDa. There are also some PNP enzymes which fall into neither class.

Defined by 10 residues: SER:A-33HIS:A-64HIS:A-86TYR:A-88GLU:A-89ALA:A-116MET:A-219SER:A-220ASN:A-243HIS:A-257
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