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Interaction of protein kinase C isozymes with Rho GTPases.

Abstract：

:Evidence is provided for direct protein-protein interactions between protein kinase C (PKC) alpha, betaI, betaII, gamma, delta, epsilon, and zeta and members of the Rho family of small GTPases. Previous investigations, based on the immunoprecipitation approach, have provided evidence consistent with a direct interaction, but this remained to be proven. In the study presented here, an in vitro assay, consisting only of purified proteins and the requisite PKC activators and cofactors, was used to determine the effects of Rho GTPases on the activities of the different PKC isoforms. It was found that the activity of PKCalpha was potently enhanced by RhoA and Cdc42 and to a lesser extent by Rac1, whereas the effects on the activities of PKCbetaI, -betaII, -gamma, -delta, -epsilon, and -zeta were much reduced. These results indicate a direct interaction between PKCalpha and each of the Rho GTPases. However, the Rho GTPase concentration dependencies for the potentiating effects on PKCalpha activity differed for each Rho GTPase and were in the following order: RhoA > Cdc42 > Rac1. PKCalpha was activated in a phorbol ester- and Ca(2+)-dependent manner. This was reflected by a substantial decrease in the phorbol ester concentration requirements for activity in the presence of Ca(2+), which for each Rho GTPase was induced within a low nanomolar phorbol ester concentration range. The activity of PKCalpha also was found to be dependent on the nature of the GTP- or GDP-bound state of the Rho GTPases, suggesting that the interaction may be regulated by conformational changes in both PKCalpha and Rho GTPases. Such an interaction could result in significant cross-talk between the distinct pathways regulated by these two signaling elements.

journal_name

Biochemistry

journal_title

Biochemistry

authors

Slater SJ,Seiz JL,Stagliano BA,Stubbs CD

doi

10.1021/bi001654n

subject

Has Abstract

pub_date

2001-04-10 00:00:00

pages

4437-45

issue

14

eissn

0006-2960

issn

1520-4995

pii

bi001654n

journal_volume

40

pub_type

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