Regulation of Inositol Lipid-specific Phospholipase Cdelta by Changes in Ca2+ Ion Concentrations

Overview

Journal Biochem J

Specialty Biochemistry

Date 1997 Nov 14

PMID 9359428

Citations 59

Authors

V Allen

P Swigart

R Cheung

S Cockcroft

M Katan

Affiliations

Soon will be listed here.

Abstract

Studies of inositol lipid-specific phospholipase C (PLC) have elucidated the main regulatory pathways for PLCbeta and PLCgamma but the regulation of PLCdelta isoenzymes still remains obscure. Here we demonstrate that an increase in Ca2+ ion concentration within the physiological range (0.1-10 microM) is sufficient to stimulate PLCdelta1, but not PLCgamma1 and PLCbeta1, to hydrolyse cellular inositol lipids present in permeabilized cells. The activity of PLCdelta1 is further enhanced in the presence of phosphatidylinositol transfer protein (PI-TP). Both full activation by Ca2+ ions and stimulation in the presence of PI-TP require an intact PH domain involved in the membrane attachment of PLCdelta1. The physiological implication of this study is that PLCdelta1 could correspond to a previously uncharacterized PLC responsible for Ca2+ ion-stimulated inositol lipid hydrolysis observed in many cellular systems.

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