Download MendeleyInsights into the mechanism of drug resistance: X-ray structure analysis of G48V/C95F tethered HIV-1 protease dimer/saquinavir complex
Prashar, V., Bihani, S.C., Das, A., Rao, D.R., Hosur, M.V.(2010) Biochem Biophys Res Commun 396: 1018-1023
- PubMed: 20471372
- DOI: https://doi.org/10.1016/j.bbrc.2010.05.049
- Primary Citation of Related Structures:
3N3I - PubMed Abstract:
The mutation G48V in HIV-1 protease is a major resistance mutation against the drug saquinavir. Recently, G48V mutation is found to co-exist with the mutation C95F in AIDS patients treated with saquinavir. We report here the three-dimensional crystal structure of G48V/C95F tethered HIV-1 protease/saquinavir complex. The structure indicates following as the possible causes of drug resistance: (1) loss of direct van der Waals interactions between saquinavir and enzyme residues PHE-53 and PRO-1081, (2) loss of water-mediated hydrogen bonds between the carbonyl oxygen atoms in saquinavir and amide nitrogen atoms of flap residues 50 and 1050, (3) changes in inter-monomer interactions, which could affect the energetics of domain movements associated with inhibitor-binding, and (4) significant reduction in the stability of the mutant dimer. The present structure also provides a rationale for the clinical observation that the resistance mutations C95F/G48V/V82A occur as a cluster in AIDS patients.
Organizational Affiliation:
Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India.
