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Mol. Cell. Biol., 05 1997, 2425-2435, Vol 17, No. 5
AL Olson, JB Knight and JE Pessin
Introduction of the cytoplasmic domain of syntaxin 4, using either
recombinant vaccinia virus or single-cell microinjection, resulted in an
inhibition of insulin-stimulated GLUT4 but not GLUT1 translocation to the
plasma membrane. This was specific for syntaxin 4, since neither the
expression of syntaxin 3 nor the expression of a syntaxin 4 mutant in which
the vesicle-associated membrane protein (VAMP) binding site was deleted had
any significant effect. Consistent with the requirement for a functional
VAMP binding site, expression of the cytoplasmic domains of VAMP2 or
VAMP3/cellubrevin also resulted in an inhibition of insulin-stimulated
GLUT4 translocation. In addition, immunoprecipitation of the expressed
syntaxin 4 cytoplasmic domain resulted in an insulin-stimulated increase in
the coimmunoprecipitation of GLUT4-containing vesicles. Together, these
data demonstrate that syntaxin 4, VAMP2, and/or VAMP3/cellubrevin can
function as target membrane and vesicle SNAP receptors, respectively, for
insulin- responsive GLUT4 translocation to the plasma membrane.
Copyright © 1997, American Society for Microbiology
Syntaxin 4, VAMP2, and/or VAMP3/cellubrevin are functional target membrane and vesicle SNAP receptors for insulin-stimulated GLUT4 translocation in adipocytes
Department of Physiology & Biophysics, University of Iowa, Iowa City 52242-1109, USA.
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