Domain coupling in activation of a family C GPCR.

Domain coupling in activation of a family C GPCR.
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C 族 GPCR 激活中的域偶联。

DOI:
10.1101/2024.02.28.582567
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发表时间:
2024
期刊:
bioRxiv : the preprint server for biology
影响因子:
--
通讯作者:
Isacoff,EhudY
Isacoff,EhudY
中科院分区:
--
文献类型:
--
作者:
Latorraca,NaomiR;Sabaat,Sam;Habrian,Chris;Bleier,Julia;Stanley,Cherise;Marqusee,Susan;Isacoff,EhudY

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The G protein-coupled metabotropic glutamate receptors form homodimers and heterodimers with highly diverse responses to glutamate and varying physiological functions. We employ molecular dynamics, single-molecule spectroscopy and hydrogen–deuterium exchange to dissect the activation pathway triggered by glutamate. We find that activation entails multiple loosely coupled steps, including formation of an agonist-bound, pre-active intermediate whose transition to active conformations forms dimerization interface contacts that set efficacy. The agonist-bound receptor populates at least two additional intermediates en route to G protein-coupling conformations. Sequential transitions into these states act as ‘gates’, which attenuate the effects of glutamate. Thus, the agonist-bound receptor is remarkably dynamic, with low occupancy of G protein-coupling conformations, providing considerable headroom for modulation by allosteric ligands. Sequence variation within the dimerization interface, as well as altered conformational coupling in receptor heterodimers, may contribute to precise decoding of glutamate signals over broad spatial and temporal scales.
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