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The Duffy antigen/receptor for chemokines (DARC) is an unusual chemokine receptor that binds a large number of inflammatory chemokines of both the CC and CXC families with nanomolar affinity, yet it lacks the ability to signal upon ligand binding. Using bioluminescent resonant energy transfer, we have demonstrated for the first time that DARC exists as a constitutive homo-oligomer in living cells and furthermore that DARC hetero-oligomerizes with the CC chemokine receptor CCR5. DARC-CCR5 interaction impairs chemotaxis and calcium flux through CCR5, whereas internalization of CCR5 in response to ligand binding remains unchanged. These results suggest a novel mechanism by which DARC could modulate inflammatory responses to chemokines in vivo.

Original publication

DOI

10.1124/mol.107.040915

Type

Journal article

Journal

Mol Pharmacol

Publication Date

05/2008

Volume

73

Pages

1362 - 1370

Keywords

Animals, Arrestins, Binding Sites, CCR5 Receptor Antagonists, Calcium, Cell Line, Cell Survival, Chemotaxis, Dimerization, Duffy Blood-Group System, Endocytosis, Endothelial Cells, GTP-Binding Protein alpha Subunits, Gi-Go, Humans, Ligands, Mice, Protein Binding, Protein Structure, Quaternary, Receptors, Cell Surface, Signal Transduction, Transfection, beta-Arrestins