Non-canonical functions of RGS proteins.

Non-canonical functions of RGS proteins.
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DOI:
10.1016/j.cellsig.2010.03.016
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发表时间:
2010-09
影响因子:
4.8
通讯作者:
Dulin NO
Dulin NO
中科院分区:
生物学2区
文献类型:
--
作者:
Sethakorn N;Yau DM;Dulin NO

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G蛋白信号传导调节因子(Regulators of G protein signaling,RGS)蛋白通过RGS结构域的存在而联合成一个家族,RGS结构域作为异源三聚体G蛋白的各种G α亚基的GTP酶激活蛋白(GAP)。通过这种机制,RGS蛋白调节许多G蛋白偶联受体的信号传导。除了RGS结构域之外,RGS蛋白还含有各种长度的不同区域,这些区域通常通过与其他配偶体的相互作用来调节RGS蛋白的细胞内定位、GAP活性或受体选择性。然而,人们越来越认识到,通过这些非RGS区域,RGS蛋白可以发挥不同于Ga亚基失活的非典型功能。本文综述了RGS蛋白在(i)G蛋白信号的非经典机制的调节,(ii)非G蛋白信号的调节,(iii)不与G蛋白偶联的受体的信号转导,(iv)丝裂原活化蛋白激酶的激活,以及(v)细胞核中的非经典功能中的作用。
Regulators of G protein signalling (RGS) proteins are united into a family by the presence of the RGS domain which serves as a GTPase-activating protein (GAP) for various Galpha subunits of heterotrimeric G proteins. Through this mechanism, RGS proteins regulate signalling of numerous G protein-coupled receptors. In addition to RGS domains, RGS proteins contain diverse regions of various lengths that regulate intracellular localization, GAP activity or receptor selectivity of RGS proteins, often through interaction with other partners. However, it is becoming increasingly appreciated that through these non-RGS regions, RGS proteins can serve non-canonical functions distinct from inactivation of Galpha subunits. This review summarizes the data implicating RGS proteins in (i) regulation of G protein signalling by non-canonical mechanisms, (ii) regulation of non-G protein signalling, (iii) signal transduction from receptors not coupled to G proteins, (iv) activation of mitogen-activated protein kinases, and (v) non-canonical functions in the nucleus.
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