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Biochem J. Dec 15, 1994; 304(Pt 3): 1001–1008.
PMCID: PMC1137431

Phosphatidic acid activation of protein kinase C-zeta overexpressed in COS cells: comparison with other protein kinase C isotypes and other acidic lipids.

Abstract

Phosphatidic acid (PA) is produced rapidly in agonist-stimulated cells, but the physiological function of this PA is unknown. We have examined the effects of PA on distinct isoforms of protein kinase C (PKC) using a new cell-free assay system. Addition of PA to cytosol from COS cells overexpressing PKC-alpha, -epsilon or -zeta differentially-activated all three isotypes, as shown by PKC autophosphorylation, and prominent phosphorylation of multiple endogenous substrates. In the absence of Ca2+, the diacylglycerol-insensitive zeta-isotype of PKC was most strongly activated by both PA and bisPA, a newly identified product of activated phospholipase D, with each lipid inducing its own profile of protein phosphorylation. BisPA was also a strong activator of PKC-epsilon, but a weak activator of PKC-alpha. Ca2+, at > or = 0.1 microM, inhibited PA and bisPA activation of PKC-zeta, but did not affect PKC-epsilon activation. In contrast, PKC-alpha was strongly activated by PA only in the presence of Ca2+. BisPA-induced phosphorylations mediated by PKC-zeta could be mimicked in part by other acidic phospholipids and unsaturated fatty acids. PA activation of PKC-zeta was unique in that PA not only stimulated PKC-zeta-mediated phosphorylation of distinctive substrates, but also caused an upward shift in electrophoretic mobility of PKC-zeta, which was not observed with other acidic lipids or with PKC-alpha or -epsilon. We have presented evidence that this mobility shift is not caused by PKC-zeta autophosphorylation, but it coincides with physical binding of PA to PKC-zeta. These results suggest that in cells stimulated under conditions where intracellular Ca2+ is at (or has returned to) basal level, PA may be a physiological activator of PKC-zeta.

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