The role of G protein conformation in receptor-G protein selectivity.

The role of G protein conformation in receptor-G protein selectivity.
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DOI:
10.1038/s41589-022-01231-z
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发表时间:
2023-06
影响因子:
14.8
通讯作者:
Lambert, Nevin A.
Lambert, Nevin A.
中科院分区:
生物学1区
文献类型:
--
作者:
Jang, Wonjo;Lu, Sumin;Xu, Xin;Wu, Guangyu;Lambert, Nevin A.

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G 蛋白偶联受体 (GPCR) 选择性激活异源三聚体 G 蛋白四个家族中的至少一个,但偶联选择性的机制仍不清楚。结构研究强调 GPCR 和无核苷酸 G 蛋白的结构互补性,但选择性可能由核苷酸释放之前存在的瞬时中间态复合物决定。在这里,我们研究与核苷酸解偶联的 G 蛋白变体的偶联,这些变体可以采用与受体结合的 G 蛋白类似的构象,而不释放核苷酸,因此能够绕过中间态复合物。我们发现,当 GPCR-G 蛋白复合物形成不需要核苷酸释放时,选择性会降低,以至于大多数 GPCR 与大多数核苷酸解偶联的 G 蛋白相互作用。这些发现证明非同源受体-G 蛋白对之间不存在绝对的结构不相容性,并且与瞬时中间态部分负责偶联选择性的假设一致。
G protein-coupled receptors (GPCRs) selectively activate at least one of the four families of heterotrimeric G proteins, but the mechanism of coupling selectivity remains unclear. Structural studies emphasize structural complementarity of GPCRs and nucleotide-free G proteins, but selectivity is likely to be determined by transient intermediate state complexes that exist prior to nucleotide release. Here we study coupling to nucleotide-decoupled G protein variants that can adopt conformations similar to receptor-bound G proteins without releasing nucleotide, and are therefore able to bypass intermediate state complexes. We find that selectivity is degraded when nucleotide release is not required for GPCR-G protein complex formation, to the extent that most GPCRs interact with most nucleotide-decoupled G proteins. These findings demonstrate the absence of absolute structural incompatibility between noncognate receptor-G protein pairs, and are consistent with the hypothesis that transient intermediate states are partly responsible for coupling selectivity.
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