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J Biol Chem, Vol. 274, Issue 36, 25308-25316, September 3, 1999
and C-
by an
Autophosphorylation-dependent Mechanism and Stimulates
Their Translocation to GLUT4 Vesicles and Other Membrane Fractions in
Rat Adipocytes
,
,
,
,
,
,
,
From the In rat adipocytes, insulin provoked rapid
increases in (a) endogenous immunoprecipitable combined
protein kinase C (PKC)-
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
/
activity in plasma membranes and
microsomes and (b) immunoreactive PKC-
and PKC-
in
GLUT4 vesicles. Activity and autophosphorylation of immunoprecipitable
epitope-tagged PKC-
and PKC-
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-
and protein kinase B, we compared their activation. Both RO 31-8220 and
myristoylated PKC-
pseudosubstrate blocked insulin-induced activation and autophosphorylation of PKC-
/
but did not inhibit PDK-1-dependent (a) protein kinase B
phosphorylation/activation or (b) threonine 410 phosphorylation in the activation loop of PKC-
. Also, insulin
in situ and PIP3 in vitro activated
and stimulated autophosphorylation of a PKC-
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-
that lacks the regulatory (presumably
PIP3-binding) domain; this may reflect PIP3
effects on PDK-1 or transphosphorylation by endogenous full-length
PKC-
. Our findings suggest that insulin activates both PKC-
and
PKC-
in plasma membranes, microsomes, and GLUT4 vesicles by a
mechanism requiring increases in PIP3, PDK-1-dependent phosphorylation of activation loop sites in
PKC-
and
, and subsequent autophosphorylation and/or transphosphorylation.
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