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JCS ePress
online publication date 16 Nov 2004
doi: 10.1242/jcs.01517
Research Article
Protein kinase B phosphorylation of PIKfyve regulates the trafficking of GLUT4 vesicles
Daniel C. Berwick,
Ghislaine C. Dell,
Gavin I. Welsh,
Kate J. Heesom,
Ingeborg Hers,
Laura M. Fletcher,
Frank T. Cooke,
and
Jeremy M. Tavaré*
* Author for correspondence (e-mail: j.tavare{at}bris.ac.uk)
Insulin-stimulated glucose uptake involves the recruitment of the glucose transporter 4 isoform (GLUT4) from an intracellular location to the plasma membrane of fat and muscle cells. Although the activation of the PI3-kinase/protein kinase B (PKB) pathway is central to this effect of insulin, the key substrates for PKB that are involved require identification. Here we report that serine318 on the FYVE domain-containing PtdIns(3)P 5-kinase (PIKfyve) is a novel substrate for PKB, and show that phosphorylation stimulates the PtdIns(3)P 5-kinase activity of the enzyme. We also demonstrate that PIKfyve is phosphorylated on serine318 in intact cells in response to insulin, in a PI3-kinase-dependent manner, and that PIKfyve colocalises with a highly motile subpopulation of insulin-regulated aminopeptidase (IRAP)/GLUT4 vesicles. Finally, we demonstrate that overexpression of a PIKfyve[S318A] mutant in 3T3-L1 adipocytes enhances insulin-stimulated IRAP/GLUT4 vesicle translocation to the plasma membrane suggesting a role for PKB-dependent phosphorylation of PIKfyve in insulin-regulated IRAP/GLUT4 trafficking. The phosphorylation and activation of PIKfyve by PKB provides a novel signalling paradigm that may link plasma membrane-localised PtdIns(3,4,5)P3 signals via a protein kinase cascade to regulated PtdIns(3,5)P2 production, and thereby to the control of trafficking of other membrane cargos.
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© The Company of Biologists Ltd 2004
