Phospholipase C gamma 1 is a physiological guanine nucleotide exchange factor for the nuclear GTPase PIKE |
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| Authors: | Ye Keqiang Aghdasi Bahman Luo Hongbo R Moriarity John L Wu Frederick Y Hong Jenny J Hurt K Joseph Bae Sun Sik Suh Pann-Ghill Snyder Solomon H |
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| Affiliation: | Johns Hopkins University School of Medicine, Department of Neuroscience, 725 N. Wolfe Street, Baltimore, Maryland 21205, USA. |
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| Abstract: | Phospholipase C gamma 1 (PLC-gamma 1) hydrolyses phosphatidylinositol-4,5-bisphosphate to the second messengers inositol-1,4,5-trisphosphate and diacylglycerol. PLC-gamma 1 also has mitogenic activity upon growth-factor-dependent tyrosine phosphorylation; however, this activity is not dependent on the phospholipase activity of PLC-gamma 1, but requires an SH3 domain. Here, we demonstrate that PLC-gamma 1 acts as a guanine nucleotide exchange factor (GEF) for PIKE (phosphatidylinositol-3-OH kinase (PI(3)K) enhancer). PIKE is a nuclear GTPase that activates nuclear PI(3)K activity, and mediates the physiological activation by nerve growth factor (NGF) of nuclear PI(3)K activity. This enzymatic activity accounts for the mitogenic properties of PLC-gamma 1. |
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