A chimeric MIP-1alpha/RANTES protein demonstrates the use of different regions of the RANTES protein to bind and activate its receptors.
J Leukoc Biol
; 69(6): 977-85, 2001 Jun.
Article
em En
| MEDLINE
| ID: mdl-11404385
ABSTRACT
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.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Quimiocina CCL5
/
Proteínas Inflamatórias de Macrófagos
/
Receptores de Quimiocinas
/
Receptores CCR5
Idioma:
En
Revista:
J Leukoc Biol
Ano de publicação:
2001
Tipo de documento:
Article
País de afiliação:
Bélgica