SOS1 Ras GEF protein (human re

Ras蛋白(Ras protein)

上释放出来,取而代之的是GTP,从而将Ras激活,GEF的活性受生长因子及其受体的影响。另一个控制Ras蛋白活性的是GTP酶激活蛋白(GTPase activating protein, GAP),存在于正常细胞中,主要作用是激活Ras蛋白的GTP酶，将结合在Ras蛋白上的 GTP水解成GDP，成为失活型的 Ras蛋白—GDP。所以在正常情况下，Ras蛋白基本上都与 GDP结合在一起，定位在细胞质膜内表面上。  

Methods to Study the Ras2 Protein Activation State and the Subcellular Localization of Ras-GTP in Saccharomyces cerevisiae

, which are active in the GTP-bound form and inactive in the GDP-bound form. Given the importance of studies on the Ras protein activation state to understand the detailed mechanism of Ras-mediated signal transduction, we provide here a simple

Development of a Yeast Two-Hybrid Screen for Selection of Human Ras-Raf Protein Interaction Inhibitors

A yeast two-hybrid screening system was developed to screen for small molecules that inhibit the interaction of the Ras and the Raf proteins. Hyperpermeable yeast strains useful for high-throughput screening (HTS) for the two-hybrid