|Superclasses:||Reactions Classified By Conversion Type → Simple Reactions → Chemical Reactions|
|Reactions Classified By Substrate → Small-Molecule Reactions|
EC Number: 188.8.131.52
Enzymes and Genes:
|Escherichia coli K-12 substr. MG1655 :||purine nucleoside phosphorylase
|Homo sapiens :||purine nucleoside phosphorylase
The reaction direction shown, that is, A + B ↔ C + D versus C + D ↔ A + B, is in accordance with the direction in which it was curated.
Mass balance status: Balanced.
Enzyme Commission Primary Name: purine-nucleoside phosphorylase
Enzyme Commission Synonyms: inosine phosphorylase, PNPase, PUNPI, PUNPII, inosine-guanosine phosphorylase, nucleotide phosphatase, purine deoxynucleoside phosphorylase, purine deoxyribonucleoside phosphorylase, purine nucleoside phosphorylase, purine ribonucleoside phosphorylase
Standard Gibbs Free Energy (ΔrG'° in kcal/mol): -7.9499817 [Latendresse13]
Enzyme Commission Summary:
Specificity not completely determined. Can also catalyse ribosyltransferase reactions of the type catalysed by EC 184.108.40.206, nucleoside ribosyltransferase.
Instance reactions of [a purine ribonucleoside + phosphate ↔ a purine base + α-D-ribose-1-phosphate] (220.127.116.11):
i1: inosine + phosphate ↔ hypoxanthine + α-D-ribose-1-phosphate (18.104.22.168)
i2: guanosine + phosphate ↔ guanine + α-D-ribose-1-phosphate (22.214.171.124/126.96.36.199)
i3: adenosine + phosphate ↔ adenine + α-D-ribose-1-phosphate (188.8.131.52)
Saunders69: Saunders PP, Wilson BA, Saunders GF (1969). "Purification and comparative properties of a pyrimidine nucleoside phosphorylase from Bacillus stearothermophilus." J Biol Chem 244(13);3691-7. PMID: 4978445
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