The Purification and Properties of Myo-inositol Monophosphatase from Bovine Brain

Overview

Journal Biochem J

Specialty Biochemistry

Date 1988 Feb 1

PMID 2833231

Citations 49

Authors

N S Gee

C I Ragan

K J Watling

S Aspley

R G JACKSON

G G Reid

D Gani

J K Shute

Affiliations

Soon will be listed here.

Abstract

1. An inositol monophosphatase was purified to homogeneity from bovine brain. 2. The enzyme is a dimer of subunit Mr 29,000. 3. The enzyme hydrolyses both enantiomers of myo-inositol 1-phosphate and both enantiomers of myo-inositol 4-phosphate, but has no activity towards inositol bisphosphates, inositol trisphosphates or inositol 1,3,4,5-tetrakisphosphate. 4. Several non-inositol-containing monophosphates are also substrates. 5. The enzyme requires Mg2+ for activity, and Zn2+ supports activity to a small extent. 6. Other bivalent cations (including Zn2+) are inhibitors, competitive with Mg2+. 7. Phosphate, but not inositol, is an inhibitor competitive with substrate. 8. Li+ inhibits hydrolysis of inositol 1-phosphate and inositol 4-phosphate uncompetitively with different apparent Ki values (1.0 mM and 0.26 mM respectively).

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