par Rucker, J;Samson, M;Doranz, Benjamin J.;Libert, Frédérick ;Berson, J F;Yi, Y;Smyth, R J;Collman, R G;Broder, C C;Vassart, Gilbert ;Doms, Robert W.;Parmentier, Marc
Référence Cell, 87, 3, page (437-446)
Publication Publié, 1996-11
Référence Cell, 87, 3, page (437-446)
Publication Publié, 1996-11
Article révisé par les pairs
Résumé : | Macrophage-tropic (M-tropic) HIV-1 strains use the beta-chemokine receptor CCR5, but not CCR2b, as a cofactor for membrane fusion and infection, while the dual-tropic strain 89.6 uses both. CCR5/2b chimeras and mutants were used to map regions of CCR5 important for cofactor function and specificity. M-tropic strains required either the amino-terminal domain or the first extracellular loop of CCR5. A CCR2b chimera containing the first 20 N-terminal residues of CCR5 supported M-tropic envelope protein fusion. Amino-terminal truncations of CCR5/CCR2b chimeras indicated that residues 2-5 are important for M-tropic viruses, while 89.6 is dependent on residues 6-9. The identification of multiple functionally important regions in CCR5, coupled with differences in how CCR5 is used by M- and dual-tropic viruses, suggests that interactions between HIV-1 and entry cofactors are conformationally complex. |