The Location of Purine Phosphoribosyltransferase Activities in Escherichia Coli

Overview

Journal Biochem J

Specialty Biochemistry

Date 1978 Sep 15

PMID 365172

Citations 1

Authors

M G Page

K Burton

Affiliations

Soon will be listed here.

Abstract

During the preparation of spheroplasts, adenine phosphoribosyltransferase (EC 2.4.2.7) and hypoxanthine phosphoribosyltransferase (EC 2.4.2.8) were released in parallel with cytidine deaminase (EC 3.5.4.5) and uridine phosphorylase (EC 2.4.2.3), which, on other evidence, are considered to be located intracellularly. The two phosphoribosyltransferases and uridine phosphorylase were not significantly associated with purified membrane fractions as was purine nucleoside phosphorylase (EC 2.4.2.1). The effects of the poorly permeable enzyme-inactivating reagents, 4-diazoniumbenzenesulphonate, 7-diazonium-1,3-naphthalene-disulphonate and 2,4,6-trinitrobenzenesulphonate, on Escherichia coli indicate that all the above-mentioned enzymes and also the xanthine-guanine phosphoribosyltransferase [Miller, Ramsey, Krenitsky & Elion (1972) Biochemistry 11, 4723--4731] are located intracellularly.

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