Structural basis of CXCR4 sulfotyrosine recognition by the chemokine SDF-1/CXCL12.
Structural basis of CXCR4 sulfotyrosine recognition by the chemokine SDF-1/CXCL12.
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DOI:
10.1126/scisignal.1160755
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发表时间:
2008-09-16
影响因子:
7.3
通讯作者:
Volkman BF
中科院分区:
文献类型:
--
作者:
Veldkamp CT;Seibert C;Peterson FC;De la Cruz NB;Haugner JC 3rd;Basnet H;Sakmar TP;Volkman BF
Stem cell homing and breast cancer metastasis are orchestrated by the chemokine SDF-1 and its receptor CXCR4. Here, we report the nuclear magnetic resonance (NMR) structure of a constitutively dimeric SDF-1 in complex with a CXCR4 fragment that contains three sulfotyrosine residues important for a high-affinity ligand-receptor interaction. CXCR4 bridged the SDF-1 dimer interface so that sulfotyrosines sTyr7 and sTyr12 of CXCR4 occupied positively charged clefts on opposing chemokine subunits. Dimeric SDF-1 induced intracellular Ca2+ mobilization but had no chemotactic activity; instead, it prevented native SDF-1-induced chemotaxis, suggesting that it acted as a potent partial agonist. Our work elucidates the structural basis for sulfotyrosine recognition in the chemokine-receptor interaction and suggests a novel strategy for CXCR4-targeted drug development.
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