Crystal structure of a common GPCR-binding interface for G protein and arrestin.

Crystal structure of a common GPCR-binding interface for G protein and arrestin.
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G蛋白和阻滞蛋白的常见GPCR结合界面的晶体结构。

DOI:
10.1038/ncomms5801
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发表时间:
2014-09-10
影响因子:
16.6
通讯作者:
Scheerer, Patrick
Scheerer, Patrick
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Szczepek, Michal;Beyriere, Florent;Hofmann, Klaus Peter;Elgeti, Matthias;Kazmin, Roman;Rose, Alexander;Bartl, Franz J.;von Stetten, David;Heck, Martin;Sommer, Martha E.;Hildebrand, Peter W.;Scheerer, Patrick

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G蛋白偶联受体(GPCR)传递细胞外信号以激活细胞内异源三聚体G蛋白(Gαβγ)和抑制蛋白。对于G蛋白信号传导,Gα C-末端(GαCT)与受体的胞质裂隙结合,该裂隙在激活时打开。来自Gi/Gt家族的GαCT和所有四种arrestins的“指环”区(ArrFL 1 -4)之间共享共有基序。在这里,我们提出了一个2.75 μ m晶体结构的ArrFL-1,一个肽类似物的手指环的视杆细胞arrestin,在复杂的原型GPCR视紫红质。通过紫外-可见吸收光谱、竞争结合试验和傅立叶变换红外光谱证实了ArrFL与受体的功能结合。对于GαCT和ArrFL,与受体裂隙的结合诱导了类似的反转结构,尽管在结合裂隙的边缘处观察到显著的结构差异。我们的研究结果反映了共同的受体结合界面和G蛋白和arrestins的不同生物学功能。 G蛋白偶联受体(GPCR)通过细胞内异源三聚体G蛋白和抑制蛋白传递信号。在这里,Szczepek等人提出了Gα和arrestin在视紫红质上的共同结合界面的结构,以阐明通过单个GPCR介导特定信号转导的关键相互作用。
G-protein-coupled receptors (GPCRs) transmit extracellular signals to activate intracellular heterotrimeric G proteins (Gαβγ) and arrestins. For G protein signalling, the Gα C-terminus (GαCT) binds to a cytoplasmic crevice of the receptor that opens upon activation. A consensus motif is shared among GαCT from the Gi/Gt family and the ‘finger loop’ region (ArrFL1–4) of all four arrestins. Here we present a 2.75 Å crystal structure of ArrFL-1, a peptide analogue of the finger loop of rod photoreceptor arrestin, in complex with the prototypical GPCR rhodopsin. Functional binding of ArrFL to the receptor was confirmed by ultraviolet-visible absorption spectroscopy, competitive binding assays and Fourier transform infrared spectroscopy. For both GαCT and ArrFL, binding to the receptor crevice induces a similar reverse turn structure, although significant structural differences are seen at the rim of the binding crevice. Our results reflect both the common receptor-binding interface and the divergent biological functions of G proteins and arrestins. G-protein-coupled receptors (GPCRs) transmit signals through intracellular heterotrimeric G proteins and arrestins. Here, Szczepek et al. present the structure of a common binding interface for Gα and arrestin on rhodopsin to shed light on key interactions that mediate transduction of specific signals through a single GPCR.
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