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.
中科院分区:
文献类型:
--
作者:
Johnston, Christopher A.;Kimple, Adam J.;Giguere, Patrick M.;Siderovski, David P.
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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DOI:
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发表时间:
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影响因子:
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期刊:
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影响因子:
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通讯作者:
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DOI:
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发表时间:
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