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. 2006 Mar;69(3):888-98.
doi: 10.1124/mol.105.015222. Epub 2005 Dec 6.

Chemokine-directed trafficking of receptor stimulus to different g proteins: selective inducible and constitutive signaling by human herpesvirus 6-encoded chemokine receptor U51

Carlos P Fitzsimons  1 , Ursula A Gompels, Dennis Verzijl, Henry F Vischer, Claire Mattick, Rob Leurs, Martine J Smit
Affiliations

Chemokine-directed trafficking of receptor stimulus to different g proteins: selective inducible and constitutive signaling by human herpesvirus 6-encoded chemokine receptor U51

Carlos P Fitzsimons et al. Mol Pharmacol. 2006 Mar.

Abstract

The human herpes virus 6 (HHV-6)-encoded chemokine receptor U51 constitutively activates phospholipase C (PLC) and inhibits cAMP-responsive element (CRE)-mediated gene transcription via the activation of G(q/11) proteins. Yet, chemokines known to bind U51 differentially regulate U51 coupling to G proteins. CCL5/RANTES induced pertussis toxin (PTX)-insensitive increases in PLC activity and changes in intracellular free calcium concentration ([Ca2+]i), whereas both CCL2/MCP-1 and CCL11/eotaxin failed to stimulate PLC activity or increase [Ca2+]i. In contrast, all three chemokines counteracted the effects of U51 on CRE activity via the activation of PTX-sensitive G(i/o) proteins. For each of the tested chemokines, coexpression of U51 with a variety of G alpha subunits, however, revealed a distinct profile for preferred G-protein coupling, which could be shifted by modulation of the relative expression of G proteins. These findings are consistent with a chemokine-selective trafficking of receptor stimulus to distinct G proteins and suggest that the constitutive activity of U51 and the chemokine-induced signaling involve different active states of the receptor. By virtue of its ability to constitutively activate signaling pathways, its G-protein promiscuity, and the chemokine-directed trafficking of receptor stimulus, U51 can be considered a sensitive and versatile virally encoded signaling device, potentially of importance in HHV-6-related pathologies.

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