Prohibitin interacts with phosphatidylinositol 3,4,5-triphosphate (PIP3) and modulates insulin signaling

被引:65
|
作者
Ande, Sudharsana R.
Mishra, Suresh [1 ,2 ]
机构
[1] Univ Manitoba, Dept Internal Med, John Buhler Res Ctr, Winnipeg, MB R3E 3P4, Canada
[2] Univ Manitoba, Dept Physiol, Winnipeg, MB R3E 3P4, Canada
关键词
Prohibitin; Insulin; Tyrosine phosphorylation; Lipid-binding domain; Lipid-protein interaction; PIP3; Akt; PHOSPHATIDYLETHANOLAMINE; TRANSFERASE; RESISTANCE; ACTIVATION; PATHWAYS; PROTEIN; COMPLEX;
D O I
10.1016/j.bbrc.2009.10.101
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
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.
引用
收藏
页码:1023 / 1028
页数:6
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