Journal
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume 390, Issue 3, Pages 1023-1028Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2009.10.101
Keywords
Prohibitin; Insulin; Tyrosine phosphorylation; Lipid-binding domain; Lipid-protein interaction; PIP3; Akt
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Funding
- Manitoba Health Research Council (MHRC)
- Winnipeg Health Sciences Centre Foundation
- MMSF Basic Science Career Development
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Mitochondrial protein prohibitin (PHB) is known to associate with the plasma membrane of various cell types. However, biological function of plasma membrane associated PHB is not known. Recently we have shown that PHB undergoes tyrosine phosphorylation in response to insulin and here we report that PHB interacts with phosphatidylinositol 3.4,5-triphosphate (PIP3). Furthermore, we demonstrate that over expression of PHB attenuates insulin signaling downstream of phosphatidylinositol 3 (PI3) kinase. This effect was not observed with over expression of tyrosine phosphorylation site mutant-PHB suggesting a role for tyrosine phosphorylation of PHB in this process. Interestingly phosphorylation of PHB by Akt attenuates its interaction with PIP3 and enhances insulin signaling. Thus, phosphorylation of PHB and its interaction with PIP3 may be a part of the regulatory mechanisms that is involved in the modulation of insulin signaling. We speculate that phosphorylation of PHB may serve as a general mechanism in the regulation of PI3 kinase signaling including growth factors and immune receptor signaling. (C) 2009 Elsevier Inc. All rights reserved.
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