Abstract
Human immunodeficiency virus type 1 protease (HIV-1 PR) cleaves two viral precursor proteins, Gag and Gag-Pol, at multiple sites. Although the processing proceeds in the rank order to assure effective viral replication, the molecular mechanisms by which the order is regulated are not fully understood. In this study, we used bioinformatics approaches to examine whether the folding preferences of the cleavage junctions influence their cleavabilities by HIV-1 PR. The folding of the eight-amino-acid peptides corresponding to the seven cleavage junctions of the HIV-1HXB2 Gag and Gag-Pol precursors were simulated in the PR-free and PR-bound states with molecular dynamics and homology modeling methods, and the relationships between the folding parameters and the reported kinetic parameters of the HIV-1HXB2 peptides were analyzed. We found that a folding preference for forming a dihedral angle of Cβ (P1)-Cα (P1)- Cα (P1’)-Cβ (P1’) in the range of 150 to 180 degrees in the PR-free state was positively correlated with the 1/Km (R = 0.95, P = 0.0008) and that the dihedral angle of the O (P2)-C (P2)- C (P1)- O (P1) of the main chains in the PR-bound state was negatively correlated with kcat (R = 0.94, P = 0.001). We further found that these two folding properties influenced the overall cleavability of the precursor protein when the sizes of the side chains at the P1 site were similar. These data suggest that the dihedral angles at the specific positions around the cleavage junctions before and after binding to PR are both critical for regulating the cleavability of precursor proteins by HIV-1 PR.
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Acknowledgments
This work was supported by a Grant-in-Aid for Japan Society for the Promotion of Science (JSPS) Research Fellowships, and a Grant for HIV/AIDS Research from the Ministry of Health, Labor and Welfare of Japan.
Author contributions
Designed the research: H.O. and H.S. Performed the research: H.O. Contributed analytic tools: M.Y. and T.K. Analyzed the data: H.O. Wrote the paper: H.O. and H.S.
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Ode, H., Yokoyama, M., Kanda, T. et al. Identification of folding preferences of cleavage junctions of HIV-1 precursor proteins for regulation of cleavability. J Mol Model 17, 391–399 (2011). https://doi.org/10.1007/s00894-010-0739-z
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DOI: https://doi.org/10.1007/s00894-010-0739-z