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The Journal of Cell Biology, Vol 115, 121-128, Copyright © 1991 by The Rockefeller University Press


ARTICLES

Phosphoinositide kinase, diacylglycerol kinase, and phospholipase C activities associated to the cytoskeleton: effect of epidermal growth factor

B Payrastre, PM van Bergen en Henegouwen, M Breton, JC den Hartigh, M Plantavid, AJ Verkleij and J Boonstra
Department of Molecular Cell Biology, University of Utrecht, The Netherlands.

In this paper we demonstrate that cytoskeletons isolated from A431 cells have associated with them high activities of several kinases involved in inositol lipid metabolism, such as phosphatidylinositol kinase, phosphatidylinositol phosphate kinase, and diacylglycerol kinase. In addition also phospholipase C activity was detected on isolated cytoskeletons. Controlled extraction of the cytoskeletons followed by in vitro polymerization of actin demonstrated an association of the kinases to the actin filament system consisting of actin and a number of actin-binding proteins. The cytoskeleton- associated lipid kinase activities were significantly increased upon treatment of intact cells with EGF. These data suggest that the association of the phosphoinositide kinases, diacylglycerol kinase, phospholipase C, and also the EGF receptor to the cytoskeleton may play a role in the efficient signal transduction induced by EGF, by providing a matrix for the various components involved in signal transduction.
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