Decomposing the energetic impact of drug resistant mutations in HIV-1 protease on binding DRV
Department of Biochemistry and Molecular Pharmacology
Medical Subject Headings
Drug Resistance, Viral; HIV Protease; HIV Protease Inhibitors; HIV-1; Sulfonamides
Darunavir (DRV) is a high affinity (4.5x10(-12) M, DeltaG = -15.2 kcal/mol) HIV-1 protease inhibitor. Two drug-resistant protease variants FLAP+ (L10I, G48V, I54V, V82A) and ACT (V82T, I84V) decrease the binding affinity with DRV by 1.0 kcal/mol and 1.6 kcal/mol respectively. In this study the absolute and relative binding free energies of DRV with wild-type protease, FLAP+ and ACT were calculated with MM-PB/GBSA and thermodynamic integration methods, respectively. Free energy decomposition elucidated that the mutations conferred resistance by distorting the active site of HIV-1 protease so that the residues that lost binding free energy were not limited to the sites of mutation. Specifically the bis-tetrahydrofuranylurethane moiety of DRV maintained interactions with the FLAP+ and ACT variants, whereas the 4 - amino phenyl group lost more binding free energy with the protease in the FLAP+ and ACT complexes than in the wild-type protease which could account for the majority of the loss in binding free energy. This suggested that replacement of the 4 - amino phenyl group might generate new inhibitors less susceptible to the drug resistant mutations.
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Citation: J Chem Theory Comput. 2010 Apr 13;6(4):1358-1368. Link to article on publisher's site
Cai, Yufeng and Schiffer, Celia A., "Decomposing the energetic impact of drug resistant mutations in HIV-1 protease on binding DRV" (2010). Biochemistry and Molecular Pharmacology Publications and Presentations. Paper 142.