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Crystal structures of HIV-1 reverse transcriptase in complex with carboxanilide derivatives
J Ren1, R M Esnouf, A L Hopkins
1Laboratory of Molecular Biophysics, Oxford, UK.
Biochemistry
|October 17, 1998
Summary
Carboxanilide nonnucleoside inhibitors (NNIs) of HIV-1 reverse transcriptase (RT) bind within the established NNI site. Structural analysis reveals distinct binding modes influencing drug resistance profiles for these important HIV-1 RT inhibitors.
Area of Science:
- Structural Biology
- Virology
- Medicinal Chemistry
Background:
- Carboxanilides are nonnucleoside inhibitors (NNIs) of HIV-1 reverse transcriptase (RT).
- These compounds exhibit varying potency and efficacy against drug-resistant HIV-1 strains.
- Previous hypotheses suggested novel binding sites for some carboxanilides, like UC-38 and UC-781.
Purpose of the Study:
- To elucidate the binding modes of four carboxanilide NNIs (UC-10, UC-38, UC-84, UC-781) with HIV-1 RT.
- To understand the structural basis for differential activity against drug-resistant mutations.
Main Methods:
- X-ray crystallography was employed to determine the structures of four HIV-1 RT-carboxanilide complexes.
- Analysis focused on the interactions between inhibitors and the RT active site, including comparisons with other NNIs.
Main Results:
- All four carboxanilides bind within the canonical NNI binding pocket, forming 1:1 binary complexes.
- Binding modes share similarities with other NNIs, particularly a hydrogen bond with Lys101.
- Subtle differences in binding, linked to substituent variations, correlate with observed resistance profiles.
Conclusions:
- Carboxanilides bind to the established NNI site, challenging prior hypotheses of alternative binding.
- Structural variations explain differential drug resistance, providing insights for future NNI design.
- The findings clarify the molecular interactions governing the efficacy of these potential anti-HIV agents.