I36T↑T mutation in South African subtype C (C-SA) HIV-1 protease significantly alters protease-drug interactions
-
Sibusiso B. Maseko
, Yasien Sayed
, Glenn E.M. Maguire
and Johnson Lin
Abstract
The efficacy of HIV-1 protease (PR) inhibition therapies is often compromised by the emergence of mutations in the PR molecule that reduces the binding affinity of inhibitors while maintaining viable catalytic activity and affinity for natural substrates. In the present study, we used a recombinant HIV-1 C-SA PR and a recently reported variant for inhibition (Ki, IC50) and thermodynamic studies against nine clinically used inhibitors. This is the first time that binding free energies for C-SA PR and the mutant are reported. This variant PR harbours a mutation and insertion (I36T↑T) at position 36 of the C-SA HIV-1 PR, and did not show a significant difference in the catalytic effect of the HIV-1 PR. However, the nine clinically approved HIV PR drugs used in this study demonstrated weaker inhibition and lower binding affinities toward the variant when compared to the wild type HIV-1 PR. All the protease inhibitors (PIs), except Amprenavir and Ritonavir exhibited a significant decrease in binding affinity (p<0.0001). Darunavir and Nelfinavir exhibited the weakest binding affinity, 155- and 95-fold decreases respectively, toward the variant. Vitality values for the variant PR, against the seven selected PIs, confirm the impact of the mutation and insertion on the South African HIV-1 subtype C PR. This information has important clinical implications for thousands of patients in Sub-Saharan Africa.
Acknowledgements
We thank the NRF, UKZN, University of the Witwatersrand, Aspen Pharmacare and MRC (SA) for financial support. The protease sequence was supplied by Professor Lynn Morris (HIV Research, National Institute for Communicable Diseases, South Africa).
Conflict of interest statement: The authors declare that they have no competing interests.
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Articles in the same Issue
- Frontmatter
- Reviews
- Aeromonas sobria serine protease (ASP): a subtilisin family endopeptidase with multiple virulence activities
- Targeting and inactivation of bacterial toxins by human defensins
- S100A6 – focus on recent developments
- Catalase, a remarkable enzyme: targeting the oldest antioxidant enzyme to find a new cancer treatment approach
- Research Articles/Short Communications
- Protein Structure and Function
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- Mutation of N-linked glycosylation in EpCAM affected cell adhesion in breast cancer cells
- Galanin suppresses proliferation of human U251 and T98G glioma cells via its subtype 1 receptor
- Role of sigma 1 receptor in high fat diet-induced peripheral neuropathy
- Proteolysis
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