Further Properties and Possibel Mechanism of Action of Adenosine 5'-triphosphate-D-glucose 6-phosphotransferase from Rat Liver

Overview

Journal Biochem J

Specialty Biochemistry

Date 1967 Nov 1

PMID 5583991

Citations 11

Authors

M J Parry

D G Walker

Affiliations

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Abstract

1. Magnesium ions are the most effective bivalent ions in the glucokinase reaction. 2. The molecular weight of rat hepatic glucokinase is 48000-49000 as assessed by gel filtration on Sephadex G-100. 3. Anomalous kinetic behaviour at low glucose concentrations appears to be due to the formation during the purification procedure of fragments possessing modified catalytic properties, but is unlikely to be of physiological significance. 4. Extension of previous studies (Parry & Walker, 1966) suggests that glucokinase catalyses a reaction of the random Bi Bi type similar to that of yeast hexokinase. 5. The inhibitory effects of various thiol reagents suggest that a thiol group may be involved at or near the binding site of the acceptor molecule.

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