کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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2189415 | 1096210 | 2006 | 10 صفحه PDF | دانلود رایگان |
Tyrosine sulfation of the chemokine receptor CXCR4 enhances its interaction with the chemokine SDF-1α. Given similar post-translational modification of other receptors, including CCR5, CX3CR1 and CCR2b, tyrosine sulfation may be of universal importance in chemokine signaling. N-terminal domains from seven transmembrane chemokine receptors have been employed for structural studies of chemokine–receptor interactions, but never in the context of proper post-translational modifications known to affect function. A CXCR4 peptide modified at position 21 by expressed tyrosylprotein sulfotransferase-1 and unmodified peptide are both disordered in solution, but bind SDF-1α with low micromolar affinities. NMR and fluorescence polarization measurements showed that the CXCR4 peptide stabilizes dimeric SDF-1α, and that sulfotyrosine 21 binds a specific site on the chemokine that includes arginine 47. We conclude that the SDF-1α dimer preferentially interacts with receptor peptide, and residues beyond the extreme N-terminal region of CXCR4, including sulfotyrosine 21, make specific contacts with the chemokine ligand.
Journal: Journal of Molecular Biology - Volume 359, Issue 5, 23 June 2006, Pages 1400–1409