Structure of the parathyroid hormone receptor C terminus bound to the G-protein dimer Gbeta1gamma2.

Structure of the parathyroid hormone receptor C terminus bound to the G-protein dimer Gbeta1gamma2.
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DOI:
10.1016/j.str.2008.04.010
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发表时间:
2008-07
期刊:
影响因子:
5.7
通讯作者:
Siderovski, David P.
Siderovski, David P.
中科院分区:
生物学2区
文献类型:
--
作者:
Johnston, Christopher A.;Kimple, Adam J.;Giguere, Patrick M.;Siderovski, David P.

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Gβγ 二聚体在异源三聚体 G 蛋白信号传导中的关键作用是促进细胞表面 G 蛋白偶联受体与 Gα 亚基的结合和激活。然而,受体和 Gβγ 之间连接的高分辨率结构信息此前尚未获得。在这里,我们描述了通过 X 射线晶体学获得的 Gβ1γ2 与甲状旁腺激素受体 1 (PTH1R) C 末端区域复合物的结构决定因素。该结构表明,PTH1R 内的几个关键残基仅接触位于 Gβ 环形结构的 WD1 和 WD7 重复片段外边缘内的 Gβ 残基。这些区域包含预测的 Gβ 面向膜区域,该区域被认为以跨膜受体可接近的方式定向。 Gβ1 上关键受体接触残基的突变导致受体/异源三聚体偶联的选择性功能丧失,同时保留效应磷脂酶-C beta 的 Gβ1γ2 激活。
A critical role of the Gβγ dimer in heterotrimeric G-protein signaling is to facilitate engagement and activation of the Gα subunit by cell-surface G protein-coupled receptors. However, high-resolution structural information of the connectivity between receptor and Gβγ has not previously been available. Here, we describe the structural determinants of Gβ1γ2 in complex with a C-terminal region of the parathyroid hormone receptor-1 (PTH1R) as obtained by x-ray crystallography. The structure reveals that several critical residues within PTH1R contact solely Gβ residues located within the outer edge of WD1 and WD7 repeat segments of the Gβ toroid structure. These regions encompass a predicted membrane-facing region of Gβ thought to be oriented in a fashion that is accessible to the membrane-spanning receptor. Mutation of key receptor contact residues on Gβ1 lead to a selective loss-of-function in receptor/heterotrimer coupling while preserving Gβ1γ2 activation of the effector phospholipase-C beta.
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