The Journal of Experimental Medicine
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© The Rockefeller University Press, 0022-1007/2000/2/573/ $5.00
The Journal of Experimental Medicine, Volume 191, Number 3, February 7, 2000 573-578


Brief Definitive Report

A Broad Spectrum Secreted Chemokine Binding Protein Encoded by a Herpesvirus

Christopher M. Parrya, J. Pedro Simasa, Vincent P. Smitha, C. Andrew Stewarta, Anthony C. Minsona, Stacey Efstathioua, and Antonio Alcamia
a From the Division of Virology, Department of Pathology, University of Cambridge, Cambridge CB2 1QP, United Kingdom

Correspondence to: Stacey Efstathiou, Div. of Virology, Dept. of Pathology, University of Cambridge, Tennis Court Rd., Cambridge CB2 1QP, UK. Tel:44-1223-336919 Fax:44-1223-336926 E-mail:se{at}mole.bio.cam.ac.uk.

Chemokines are a family of small proteins that interact with seven-transmembrane domain receptors and modulate the migration of immune cells into sites of inflammation and infection. The murine gammaherpesvirus 68 M3 gene encodes a secreted 44-kD protein with no sequence similarity to known chemokine receptors. We show that M3 binds a broad range of chemokines, including CC, CXC, C, and CX3C chemokines, but does not bind human B cell–specific nor mouse neutrophil–specific CXC chemokines. This herpesvirus chemokine binding protein (hvCKBP) blocks the interaction of chemokines with high-affinity cellular receptors and inhibits chemokine-induced elevation of intracellular calcium levels. hvCKBP is the first soluble chemokine receptor identified in herpesviruses; it represents a novel protein structure with the ability to bind all subfamilies of chemokines in solution and has potential therapeutic applications.

Key Words: chemokine, cytokine receptor, virus, viral immune evasion, anti-inflammatory protein


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