Structure-Based Design and Synthesis of an HIV-1 Entry Inhibitor Exploiting X-Ray and Thermodynamic Characterization.
Publication Type:Journal Article
Source:ACS Med Chem Lett, Volume 4, Issue 3, p.338-343 (2013)
<p>The design, synthesis, thermodynamic and crystallographic characterization of a potent, broad spectrum, second-generation HIV-1 entry inhibitor that engages conserved carbonyl hydrogen bonds within gp120 has been achieved. The optimized antagonist exhibits a sub-micromolar binding affinity (110 nM) and inhibits viral entry of clade B and C viruses (IC geometric mean titer of 1.7 and 14.0 μM, respectively), without promoting CD4-independent viral entry. thermodynamic signatures indicate a binding preference for the ()-over the ()-enantiomer. The crystal structure of the small molecule-gp120 complex reveals the displacement of crystallographic water and the formation of a hydrogen bond with a backbone carbonyl of the bridging sheet. Thus, structure-based design and synthesis targeting the highly conserved and structurally characterized CD4:gp120 interface is an effective tactic to enhance the neutralization potency of small molecule HIV-1 entry inhibitors.</p>