Importance of the G protein gamma subunit in activating G protein-coupled inward rectifier K(+) channels.

Importance of the G protein gamma subunit in activating G protein-coupled inward rectifier K(+) channels.
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G 蛋白 γ 亚基在激活 G 蛋白偶联内向整流 K( ) 通道中的重要性。

DOI:
10.1016/s0014-5793(99)01656-7
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发表时间:
1999
期刊:
影响因子:
3.5
通讯作者:
Itoh,H
Itoh,H
中科院分区:
生物学3区
文献类型:
--
作者:
Kawano,T;Chen,L;Watanabe,SY;Yamauchi,J;Kaziro,Y;Nakajima,Y;Nakajima,S;Itoh,H

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G蛋白偶联内向整流钾通道(GIRK)通过与异源三聚体GTP结合蛋白βγ亚基(Gβγ)直接相互作用而被激活。然而,Gβ和Gγ在GIRK激活中的确切作用仍有待阐明。利用GIRK 1、GIRK 2、Gβ1和Gγ2在人胚肾293细胞中的瞬时表达,我们发现不与Gγ2结合的Gβ1的C末端突变体仍然能够与GIRK结合,但这些突变体不能诱导GIRK通道的激活。相反,Gβ1的其他C末端突变体与Gγ2结合,能够激活GIRK通道。这些结果表明,在Gβγ诱导的GIRK激活中,Gγ比锚定装置起更重要的作用。
The G protein-coupled inward rectifier K+channel (GIRK) is activated by direct interaction with the heterotrimeric GTP-binding protein βγ subunits (Gβγ). However, the precise role of Gβ and Gγ in GIRK activation remains to be elucidated. Using transient expression of GIRK1, GIRK2, Gβ1, and Gγ2 in human embryonic kidney 293 cells, we show that C-terminal mutants of Gβ1, which do not bind to Gγ2, are still able to associate with GIRK, but these mutants are unable to induce activation of GIRK channels. In contrast, other C-terminal mutants of Gβ1 that bind to Gγ2, are capable of activating the GIRK channel. These results suggest that Gγ plays a more important role than that of an anchoring device for the Gβγ-induced GIRK activation.
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