Allosteric modulation of ghrelin receptor signaling by lipids.

Allosteric modulation of ghrelin receptor signaling by lipids.
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脂质对胃饥饿素受体信号传导的变构调节 。

DOI:
10.1038/s41467-021-23756-y
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发表时间:
2021-06-24
影响因子:
16.6
通讯作者:
Banères JL
Banères JL
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Damian M;Louet M;Gomes AAS;M'Kadmi C;Denoyelle S;Cantel S;Mary S;Bisch PM;Fehrentz JA;Catoire LJ;Floquet N;Banères JL

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该膜是 G 蛋白偶联受体信号传导机制的一个组成部分。在这里,我们证明脂质通过特定的相互作用和整体效应调节生长素释放肽受体 GHSR 的信号传导功效和选择性。我们发现 PIP2 使 GHSR 的构象平衡偏离其非活性状态,有利于基础和激动剂诱导的 G 蛋白激活。这是因为在受体活性状态下 PIP2 优先结合到特定的细胞内位点。另一种脂质 GM3 也结合 GHSR 并有利于 G 蛋白激活,但主要是以生长素释放肽依赖性方式。最后,我们发现不仅选择性相互作用,而且双层的厚度也重塑了 GHSR 的构象,对 G 蛋白选择性产生直接影响。总而言之,这些数据阐明了膜成分作为生长素释放肽信号如何传播的变构调节剂的多方面作用。该膜是 G 蛋白偶联受体信号传导机制的一个组成部分。作者在此证明,脂质通过特定的相互作用和整体效应调节生长素释放肽受体 GHSR 的信号传导功效和选择性,并观察到 ​​PIP2 和 GM3 诱导 GHSR 构象平衡从其非活性状态发生转变。
The membrane is an integral component of the G protein-coupled receptor signaling machinery. Here we demonstrate that lipids regulate the signaling efficacy and selectivity of the ghrelin receptor GHSR through specific interactions and bulk effects. We find that PIP2 shifts the conformational equilibrium of GHSR away from its inactive state, favoring basal and agonist-induced G protein activation. This occurs because of a preferential binding of PIP2 to specific intracellular sites in the receptor active state. Another lipid, GM3, also binds GHSR and favors G protein activation, but mostly in a ghrelin-dependent manner. Finally, we find that not only selective interactions but also the thickness of the bilayer reshapes the conformational repertoire of GHSR, with direct consequences on G protein selectivity. Taken together, this data illuminates the multifaceted role of the membrane components as allosteric modulators of how ghrelin signal could be propagated. The membrane is an integral component of the G protein-coupled receptor signaling machinery. Here authors demonstrate that lipids regulate the signaling efficacy and selectivity of the ghrelin receptor GHSR through specific interactions and bulk effects and observe PIP2 and GM3 induced shifts of the conformational equilibrium of GHSR away from its inactive state.
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