Abstract
Ankyrins are cellular repeat proteins, which can be genetically modified to randomize amino-acid residues located at defined positions in each repeat unit, and thus create a potential binding surface adaptable to macromolecular ligands. From a phage-display library of artificial ankyrins, we have isolated AnkGAG1D4, a trimodular ankyrin which binds to the HIV-1 capsid protein N-terminal domain (NTDCA) and has an antiviral effect at the late steps of the virus life cycle. In this study, the determinants of the AnkGAG1D4-NTDCA interaction were analyzed using peptide scanning in competition ELISA, capsid mutagenesis, ankyrin crystallography and molecular modeling. We determined the AnkGAG1D4 structure at 2.2 Å resolution, and used the crystal structure in molecular docking with a homology model of HIV-1 capsid. Our results indicated that NTDCA alpha-helices H1 and H7 could mediate the formation of the capsid-AnkGAG1D4 binary complex, but the interaction involving H7 was predicted to be more stable than with H1. Arginine-18 (R18) in H1, and R132 and R143 in H7 were found to be the key players of the AnkGAG1D4-NTDCA interaction. This was confirmed by R-to-A mutagenesis of NTDCA, and by sequence analysis of trimodular ankyrins negative for capsid binding. In AnkGAG1D4, major interactors common to H1 and H7 were found to be S45, Y56, R89, K122 and K123. Collectively, our ankyrin-capsid binding analysis implied a significant degree of flexibility within the NTDCA domain of the HIV-1 capsid protein, and provided some clues for the design of new antivirals targeting the capsid protein and viral assembly.
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Acknowledgments
The work in Thailand was supported by the National Research University project under the Thailand’s Office of the Commission on Higher Education, the Research Chair Grant of National Sciences and the Technology Development Agency at the Faculty of Associated Medical Sciences, Chiang Mai University, and the Thailand Research Fund. The work in Lyon was supported by the French National Agency for Research on AIDS and Viral Hepatitis (Inserm-ANRS contract No. 11344/2011-2013). We are grateful to thank Prof. Dr. Kiat Ruxrungtham for his kind gift of synthetic pentadecapeptides, and the NIH AIDS Research and Reference Reagent Program for providing us with the pNL4-3 plasmid. The authors would like to thank the National Electronics and Computer Technology (NECTEC) for Discovery Studio software and also thank the University of Malaya for UMRG (Grant No. RP002-2012D) and FRGS (FP008-2012A), and for its support with computational work. We are also indebted to the supporting staffs at beamline BL13B1 at NSRRC and beamline BL12B2 at SPring-8 for the technical assistance. The crystallographic work was supported in part by National Science Council Grants 101-2628-B-213-001-MY4 and NSRRC Grant 1013RSB02 to C.-J. Chen.
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Warachai Praditwongwan and Phimonphan Chuankhayan have contributed equally.
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Praditwongwan, W., Chuankhayan, P., Saoin, S. et al. Crystal structure of an antiviral ankyrin targeting the HIV-1 capsid and molecular modeling of the ankyrin-capsid complex. J Comput Aided Mol Des 28, 869–884 (2014). https://doi.org/10.1007/s10822-014-9772-9
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DOI: https://doi.org/10.1007/s10822-014-9772-9