Structural biology. Structural basis for chemokine recognition and activation of a viral G protein-coupled receptor.

Structural biology. Structural basis for chemokine recognition and activation of a viral G protein-coupled receptor.
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DOI:
10.1126/science.aaa5026
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发表时间:
2015-03-06
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Garcia KC
Garcia KC
中科院分区:
其他
文献类型:
--
作者:
Burg JS;Ingram JR;Venkatakrishnan AJ;Jude KM;Dukkipati A;Feinberg EN;Angelini A;Waghray D;Dror RO;Ploegh HL;Garcia KC

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趋化因子是通过激活趋化因子G蛋白偶联受体(gpcr)发挥免疫调节剂作用的小蛋白。一些病毒也编码趋化因子和趋化因子受体来破坏宿主的免疫反应。蛋白质配体如何激活gpcr仍不清楚。我们报道了人巨细胞病毒GPCR US28与人CX3CL1 (fractalkine)趋化因子结构域复合物在2.9埃分辨率下的晶体结构。CX3CL1的球状体位于US28细胞外前庭的顶部,而其氨基末端则位于US28的中心核心。US28的跨膜螺旋呈活性态构象。原子水平的模拟表明,US28不依赖于激动剂的活性可能是由于病毒GPCR中进化出的氨基酸网络破坏了受体的失活状态。
Chemokines are small proteins that function as immune modulators through activation of chemokine G protein–coupled receptors (GPCRs). Several viruses also encode chemokines and chemokine receptors to subvert the host immune response. How protein ligands activate GPCRs remains unknown. We report the crystal structure at 2.9 angstrom resolution of the human cytomegalovirus GPCR US28 in complex with the chemokine domain of human CX3CL1 (fractalkine). The globular body of CX3CL1 is perched on top of the US28 extracellular vestibule, whereas its amino terminus projects into the central core of US28. The transmembrane helices of US28 adopt an active-state–like conformation. Atomic-level simulations suggest that the agonist-independent activity of US28 may be due to an amino acid network evolved in the viral GPCR to destabilize the receptor’s inactive state.
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