Stability of the sCD4-activated intermediate form of the HIV-1 envelope glycoproteins.Conformational Stability of the CD4-Activated IntermediateEngagement of CD4 induces a major structural rearrangement of the HIV-1 envelope glycoproteins [2]. Two functionally important regions of the HIV-1 envelope glycoproteins are formed and exposed as a result of CD4 binding: i) the coreceptor-binding site on

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Coproteins [1]. Binding of gp120 to the receptor, CD4, on the target cell surface induces major conformational changes in the envelope glycoproteins [2]. These changes allow gp120 to bind the viral coreceptor, either CXCR4 or CCR5 [3?]. CD4 binding also induces the formation of a gp41 pre-hairpin intermediate, in which three hydrophobic grooves on the surface of a coiled coil formed by the heptad

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Ing administration of rifabutin 300 mg once daily (Treatment A, #) or rifabutin 300 mg once daily plus SQV-SGC 1200 mg three times daily (Treatment C, ).treatment was greater (33 ) compared to when coadministered with saquinavir (21 ). The within patient variability was approximately 29 .Effects of rifabutin on saquinavirpharmacokineticsThe mean ( CV) AUC(0,8 h), Cmax and C8 for saquinavir when a