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Selectivity of CDC25 homology domain-containing guanine nucleotide exchange factors

机译:含有CDC25同源域的鸟嘌呤核苷酸交换因子的选择性

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摘要

The Ras family of small G-proteins plays an essential role in the regulation of a variety of signal transduction processes, ranging from cell cycle control to the regulation of exocytosis. Signalling by the Ras G-proteins is initiated by the CDC25 homology domain (CDC25-HD) containing guanine nucleotide exchange factors (GEFs); each GEF, with its specific selectivity profile towards G-proteins, commonly acts on only a small subset of the Ras family members. Thus, GEFs play a pivotal part in establishing the activation of the downstream signalling routes. The structural basis for the establishment of selectivity in the GEF-G-protein interaction is only partially understood, and several controversies on the selectivity of GEFs are discussed in the literature. In the present study, we undertook a systematic approach to determine the selectivity of CDC25-HD for members of the Ras family. We generated a data set of 126 pairs using a standardised in vitro approach encompassing purified recombinant proteins, and a comprehensive mutational study analysed the basis of the selectivity. Together, these data highlight the distinct selectivity of various GEFs and allow for predictions of untested combinations of GEFs and G-proteins.
机译:小G蛋白的Ras家族在从细胞周期控制到胞吐作用调节的各种信号转导过程中起着至关重要的作用。 Ras G蛋白发出的信号是由含有鸟嘌呤核苷酸交换因子(GEF)的CDC25同源域(CDC25-HD)启动的;每个GEF具有对G蛋白的特定选择性,通常只作用于Ras家族成员的一小部分。因此,GEF在建立下游信号通路的激活中起着关键作用。在GEF-G-蛋白质相互作用中建立选择性的结构基础仅被部分理解,并且在文献中讨论了关于GEF选择性的若干争议。在本研究中,我们采用了系统的方法来确定CDC25-HD对Ras家族成员的选择性。我们使用标准化的体外方法(包括纯化的重组蛋白)生成了126对数据集,而全面的突变研究分析了选择性的基础。总之,这些数据突出了各种GEF的独特选择性,并允许预测未经测试的GEF和G蛋白组合。

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