2a0x Summary

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Structure of human purine nucleoside phosphorylase H257F mutant

The structure was published by Murkin, A.S., Birck, M.R., Rinaldo-Matthis, A., et al., Taylor, E.A., Almo, S.C., and Schramm, V.L., in 2007 in a paper entitled "Neighboring group participation in the transition state of human purine nucleoside phosphorylase." (abstract).

This crystal structure was determined using X-ray diffraction at a resolution of 2.28 Å and deposited in 2005.

The experimental data on which the structure is based was also deposited.

The PDB entry contains the structure of Purine nucleoside phosphorylase. This molecule has the UniProt identifier P00491 (PNPH_HUMAN)search. The sample contained 289 residues which is 100% of the natural sequence. Out of 289 residues 282 were observed and are deposited in the PDB.

It also contains one or more heterogenic compounds (e.g., ligands, co-factors, ions, modified amino acids, etc.); see here for a complete list.

The molecule most likely forms homotrimers.

The following tables show cross-reference information to other databases (to obtain a list of all PDB entries sharing the same property or classification, click on the magnifying glass icon):


Chain Name UniProt Name of source organism % of UniProt sequence present in the sample Residues in the sample molecules % of residues observed
A Purine nucleoside phosphorylase P00491 (1-289) (PNPH_HUMAN)search Homo sapienssearch 100% 289 97%


This entry contains 1 unique UniProt protein:

UniProt accession Name Organism PDB
P00491 (1 - 289) Purine nucleoside phosphorylase Homo sapiens

Chain Structural classification (CATH) Sequence family (Pfam)
A (P00491) Rossmann foldsearch PF01048: Phosphorylase superfamilysearch

Chain ID Molecular function (GO) Cellular component (GO) Biological process (GO)
A (P00491) catalytic activitysearch transferase activitysearch purine-nucleoside phosphorylase activitysearch nucleoside bindingsearch transferase activity, transferring pentosyl groupssearch transferase activity, transferring glycosyl groupssearch drug bindingsearch phosphate ion bindingsearch purine nucleobase bindingsearch cytoplasmsearch cytoskeletonsearch cytosolsearch extracellular vesicular exosomesearch intracellularsearch response to drugsearch immune responsesearch nucleobase-containing compound metabolic processsearch nucleoside metabolic processsearch positive regulation of alpha-beta T cell differentiationsearch urate biosynthetic processsearch nicotinamide riboside catabolic processsearch purine nucleotide catabolic processsearch positive regulation of T cell proliferationsearch purine-containing compound salvagesearch small molecule metabolic processsearch purine nucleobase metabolic processsearch nucleobase-containing small molecule metabolic processsearch interleukin-2 secretionsearch inosine catabolic processsearch NAD biosynthesis via nicotinamide riboside salvage pathwaysearch

Chain InterPro annotation
A Nucleoside phosphorylase domainsearch PNP/MTAP phosphorylasesearch Purine nucleoside phosphorylasesearch Purine nucleoside phosphorylase I, inosine/guanosine-specificsearch Purine phosphorylase, family 2, conserved sitesearch