Assay Method Information

Assay Name:  Radioligand Binding Assay
Description:  Afterwards, the pharmacological profile of bivalent ligand 1 at the chemokine receptor CCR5 was characterized similarly. The competitive radioligand binding assay was conducted in CCR5 rhesus macaque membrane preparations from Chem-1 cells. Monovalent ligand 3 and compound 4, an analogue of maraviroc, were tested along under the same condition. Introduction of the 4-NH2 group onto the phenyl ring of maraviroc, as seen in compound 4, caused approximately 65-fold decrease in the binding affinity, compared to maraviroc. The decrease of the binding affinity was even more profound for bivalent ligand 1 and monovalent ligand 3, as their Ki values dropped to submicromolar range, respectively.
Affinity data for this assay
 

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