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J Biol Chem, Vol. 273, Issue 6, 3132-3135, February 6, 1998
, and
From the Program in Molecular Medicine and the Department of
Biochemistry and Molecular Biology, University of Massachusetts Medical
Center, Worcester, Massachusetts 01605 and the GLUT4, the glucose transporter present in
insulin-sensitive tissues, resides in intracellular vesicular
structures and translocates to the cell surface in response to insulin.
In an attempt to identify proteins present in these structures,
GLUT4-enriched vesicles prepared from rat adipocytes treated with or
without insulin were prepared by sucrose velocity gradient
centrifugation and immunoadsorbed with anti-GLUT4 antibody. We report
here the sequence identification by high performance liquid
chromatography-ion trap mass spectrometry of a p75 protein band, long
chain acyl-CoA synthetase-1, specifically present in immunoadsorbed
GLUT4-containing vesicles but not in vesicles adsorbed by nonimmune
serum. Acyl-CoA synthetase activity detected in GLUT4-enriched vesicles
prepared by gradient centrifugation from insulin-treated adipocytes was
decreased to about the same extent as GLUT4 protein. Additionally,
immunoadsorbed GLUT4 vesicles were found to catalyze palmitoylation of
proteins when incubated with labeled palmitate, a pathway that requires
palmitate esterification with CoA. These data indicate that the
insulin-sensitive membrane compartment that sequesters GLUT4 in fat
cells contains long chain acyl-CoA synthetase-1 and its product fatty
acyl-CoA, shown previously to be required for budding and fusion in
membrane trafficking processes.
Harvard
Microchemistry Facility, Harvard University,
Cambridge, Massachusetts 02318
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