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J Biol Chem, Vol. 274, Issue 36, 25308-25316, September 3, 1999

Insulin Activates Protein Kinases C-zeta and C-lambda by an Autophosphorylation-dependent Mechanism and Stimulates Their Translocation to GLUT4 Vesicles and Other Membrane Fractions in Rat Adipocytes

Mary L. StandaertDagger , Gautam BandyopadhyayDagger , Liliam PerezDagger , Debbie PriceDagger , Lamar GallowayDagger , Andrew PoklepovicDagger , Minni P. SajanDagger , Vitorria Cenni§, Alessandra Sirri§, Jorge Moscat, Alex Toker§, and Robert V. FareseDagger

From the Dagger  J. A. Haley Veterans' Hospital Research Service and the Department of Internal Medicine, University of South Florida College of Medicine, Tampa, Florida 33612, the  Centro de Biologia Molecular "Severo Ochoa", Universidad Autónoma, Canto Blanco, 28049 Madrid, Spain, and the § Signal Transduction Group, Boston Biomedical Research Institute, Boston, Massachusetts 02114

In rat adipocytes, insulin provoked rapid increases in (a) endogenous immunoprecipitable combined protein kinase C (PKC)-zeta /lambda activity in plasma membranes and microsomes and (b) immunoreactive PKC-zeta and PKC-lambda in GLUT4 vesicles. Activity and autophosphorylation of immunoprecipitable epitope-tagged PKC-zeta and PKC-lambda were also increased by insulin in situ and phosphatidylinositol 3,4,5-(PO4)3 (PIP3) in vitro. Because phosphoinositide-dependent kinase-1 (PDK-1) is required for phosphorylation of activation loops of PKC-zeta and protein kinase B, we compared their activation. Both RO 31-8220 and myristoylated PKC-zeta pseudosubstrate blocked insulin-induced activation and autophosphorylation of PKC-zeta /lambda but did not inhibit PDK-1-dependent (a) protein kinase B phosphorylation/activation or (b) threonine 410 phosphorylation in the activation loop of PKC-zeta . Also, insulin in situ and PIP3 in vitro activated and stimulated autophosphorylation of a PKC-zeta mutant, in which threonine 410 is replaced by glutamate (but not by an inactivating alanine) and cannot be activated by PDK-1. Surprisingly, insulin activated a truncated PKC-zeta that lacks the regulatory (presumably PIP3-binding) domain; this may reflect PIP3 effects on PDK-1 or transphosphorylation by endogenous full-length PKC-zeta . Our findings suggest that insulin activates both PKC-zeta and PKC-lambda in plasma membranes, microsomes, and GLUT4 vesicles by a mechanism requiring increases in PIP3, PDK-1-dependent phosphorylation of activation loop sites in PKC-zeta and lambda , and subsequent autophosphorylation and/or transphosphorylation.


Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.



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