期刊
JOURNAL OF CELL BIOLOGY
卷 216, 期 7, 页码 2011-2025出版社
ROCKEFELLER UNIV PRESS
DOI: 10.1083/jcb.201606047
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资金
- National Institutes of Health [GM113079]
- Welch Foundation [I-1789]
- Taiwan National Science Council [102-2917-I-564019]
- Direct For Biological Sciences
- Div Of Molecular and Cellular Bioscience [1157824] Funding Source: National Science Foundation
RAS association domain family 4 (RASSF4) is involved in tumorigenesis and regulation of the Hippo pathway. In this study, we identify new functional roles of RASSF4. First, we discovered that RASSF4 regulates store-operated Ca2+ entry (SOCE), a fundamental Ca2+ signaling mechanism, by affecting the translocation of the endoplasmic reticulum (ER) Ca2+ sensor stromal interaction molecule 1 (STIM1) to ER-plasma membrane (PM) junctions. It was further revealed that RAS SF4 regulates the formation of ER-PM junctions and the ER-PM tethering function of extended synaptotagmins E-Syt2 and E-Syt3. Moreover, steady-state PM phosphatidylinositol 4,5-bisphosphate (PI[4,5]P-2) levels, important for localization of STIM1 and E-Syts at ER-PM junctions, were reduced in RAS SF4-knockdown cells. Furthermore, we demonstrated that RAS SF4 interacts with and regulates the activity of adenosine diphosphate ribosylation factor 6 (ARF6), a small G protein and upstream regulator of type I phosphatidylinositol phosphate kinases (PIP5Ks) and PM PI(4,5)P-2 levels. Overall, our study suggests that RAS SF4 controls SOCE and ER-PM junctions through ARF6-dependent regulation of PM PI(4,5)P-2 levels, pivotal for a variety of physiological processes.
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