Structures of the CXCR4 chemokine GPCR with small-molecule and cyclic peptide antagonists.

Structures of the CXCR4 chemokine GPCR with small-molecule and cyclic peptide antagonists.
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DOI:
10.1126/science.1194396
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发表时间:
2010-11-19
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Stevens RC
Stevens RC
中科院分区:
其他
文献类型:
--
作者:
Wu B;Chien EY;Mol CD;Fenalti G;Liu W;Katritch V;Abagyan R;Brooun A;Wells P;Bi FC;Hamel DJ;Kuhn P;Handel TM;Cherezov V;Stevens RC

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Chemokine receptors are critical regulators of cell migration in the context of immune surveillance, inflammation and development. The G protein-coupled chemokine receptor, CXCR4, is specifically implicated in cancer metastasis and HIV-1 infection. Here we report five independent crystal structures of CXCR4 bound to an antagonist small molecule IT1t and a cyclic peptide CVX15 at 2.5–3.2 Å resolution. All structures reveal a consistent homodimer with an interface involving helices V and VI that may be involved in regulating signaling. The location and shape of the ligand binding sites differ from other G protein-coupled receptors and are closer to the extracellular surface. These structures provide new clues about the interactions between CXCR4 and its natural ligand CXCL12 and with the HIV-1 glycoprotein gp120.
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