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A chimeric MIP-1α/RANTES protein demonstrates the use of different regions of the RANTES protein to bind and activate its receptors

par Blanpain, Cédric ;Buser, R;Power, C A;Edgerton, M;Buchanan, C.;Mack, Matthias;Simmons, G;Clapham, P R;Parmentier, Marc ;Proudfoot, Amanda
Référence Journal of leukocyte biology, 69, 6, page (977-985)
Publication Publié, 2001-06

Article révisé par les pairs

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Résumé :

Human RANTES (CCL5) and MIP-1alpha (CCL3) bind and activate several CC chemokine receptors. RANTES is a high-affinity ligand for CCR1 and CCR5, and it binds CCR3 with moderate affinity and CCR4 with low affinity. MIP-1alpha has similar binding characteristics to RANTES except that it does not bind to CCR3. Here we have generated a chimera of human MIP-1alpha and RANTES, called MIP/RANTES, consisting of the eight amino terminal residues of MIP-1alpha preceding the CC motif, and the remainder of the sequence is RANTES. The chimera is able to induce chemotaxis of human monocytes. MIP/RANTES has >100-fold reduction in binding to CCR1 and does not bind to CCR3 but retains full, functional binding to CCR5. It has equivalent affinity for CCR5 to MIP-1alpha and RANTES, binding with an IC(50) of 1.12 nM, and is able to mobilize calcium and induce endocytosis of CCR5 in PBMC in a manner equi-potent to RANTES. It also retains the ability to inhibit R5 using HIV-1 strains. Therefore, we conclude that the amino terminus of RANTES is not involved in CCR5 binding, but it is essential for CCR1 and CCR3.