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题目:: In vivo interaction between RGS4 and calmodulin visualized with FRET techniques: possible involvement of lipid raft.
作者:: Ishii(Masaru),Ikushima(Masashi),Kurachi(Yoshihisa)
状态:: 发布时间2005-11-15 , 更新时间 2006-11-15
期刊:: Biochem Biophys Res Commun
摘要:: Regulators of G-protein signaling (RGS) are a family of proteins which accelerate intrinsic GTP-hydrolysis on heterotrimeric G-protein-alpha-subunits. Although it has been suggested that the function of RGS4 is reciprocally regulated by competitive binding of the membrane phospholipid, phosphatidylinositol-3,4,5,-trisphosphate(PtdIns(3,4,5)P(3)), and Ca(2+)/calmodulin (CaM), it remains to be shown that these interactions occur in vivo. Here, using fluorescence resonance energy transfer (FRET) techniques, we show that an elevation of intracellular Ca(2+) concentration by ionomycin increased the FRET efficiency from ECFP (a variant of cyan fluorescent protein)-labeled calmodulin to Venus (a variant of yellow fluorescent protein)-labeled RGS4. The increase in FRET efficiency was greatly attenuated by pre-treating the cells with methyl-beta-cyclodextrin, which depletes membrane cholesterol and thus disrupts lipid rafts. These results provide the first demonstration of a Ca(2+)-dependent interaction between RGS4 and CaM in vivo and show that association in lipid rafts of the plasma membrane might be involved in this physiological regulation of RGS proteins.
语言:: eng
DOI:: 10.1016/j.bbrc.2005.10.026

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