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. 1990 May;56(5):1435–1439. doi: 10.1128/aem.56.5.1435-1439.1990

Purification and characterization of purine nucleoside phosphorylase from Proteus vulgaris.

M Surette 1, T Gill 1, S MacLean 1
PMCID: PMC184424  PMID: 2111121

Abstract

Purine nucleoside phosphorylase was isolated and purified from cell extracts of Proteus vulgaris recovered from spoiling cod fish (Gadus morhua). The molecular weight and isoelectric point of the enzyme were 120,000 +/- 2,000 and pH 6.8. The Michaelis constant for inosine as substrate was 3.9 x 10(-5). Guanosine also served as a substrate (Km = 2.9 x 10(-5). However, the enzyme was incapable of phosphorylizing adenosine. Adenosine proved to be useful as a competitive inhibitor and was used as a ligand for affinity chromatography of purine nucleoside phosphorylase following initial purification steps of gel filtration and ion-exchange chromatography.

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Selected References

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