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. 1993 Sep 15;294(Pt 3):801–807. doi: 10.1042/bj2940801

Regulation of annexin I-dependent aggregation of phospholipid vesicles by protein kinase C.

S A Johnstone 1, I Hubaishy 1, D M Waisman 1
PMCID: PMC1134532  PMID: 8379935

Abstract

Annexin I is a member of the annexin family of Ca(2+)- and phospholipid-binding proteins. The ability of this protein to aggregate and to mediate the fusion of various types of vesicles has supported the hypothesis that this protein might be involved in intracellular membrane fusion processes such as exocytosis. Although annexin I has been described as a major in vitro substrate of both protein kinase C and the epidermal-growth-factor-receptor protein tyrosine kinase, the functional consequences of these phosphorylation events have not been investigated. In this paper we examine the effect of the phosphorylation of annexin I by protein kinase C on the phospholipid aggregation activity of the protein. The stoichiometry of phosphorylation of the protein was affected by the method of preparation of the phospholipid. Under optimal assay conditions protein kinase C catalysed the incorporation of 2.83 +/- 0.23 mol of phosphate/mol of annexin I (mean +/- S.E.M., n = 21). Studies with the Ca(2+)- and phospholipid-independent form of protein kinase C suggested that the phosphorylation of annexin I was stimulated by phospholipid in the absence of Ca2+, although maximal phosphorylation was achieved in the presence of both phospholipid and Ca2+. Phosphorylation of annexin I resulted in a dramatic decrease in the rate and extent of phospholipid vesicle aggregation, without significantly disrupting the binding of the protein to the phospholipid vesicles. The phosphorylation of annexin I increased the EC50 (Ca2+) of phospholipid vesicle aggregation from 19 +/- 10 microM (mean +/- S.D., n = 7) for the native protein to 290 +/- 95 microM (mean +/- S.D., n = 5) for the phosphorylated protein. These results suggest that protein kinase C may act to inhibit the phospholipid vesicle aggregation activity of annexin I.

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Selected References

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