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Highlighting a π–π interaction: a protein modeling and molecular dynamics simulation study on Anopheles gambiae glutathione S-transferase 1-2

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Abstract

Cytosolic insect theta class glutathione S-transferases (GSTs) have not been studied completely and their physiological roles are unknown. A detailed understanding of Anopheles gambiae GST (Aggst1-2) requires an accurate structure, which has not yet been determined. A high quality model structure of Aggst1-2 was constructed using homology modeling and the ligand–protein complex was obtained by the docking method. Molecular dynamics (MD) simulations were carried out to study conformational changes and to calculate binding free energy. The results of MD simulation indicate that Aggst1-2 undergoes small conformational changes after ligands dock to the protein, which facilitate the catalytic reaction. An essential hydrogen bond was found between the sulfur atom of glutathione (GSH) and the hydrogen atom of hydroxyl group in Ser9, which was in good agreement with experimental data. A π–π interaction between Phe204 and CDNB ligand was also found. This interaction seems to be important in stabilization of the ligand. Further study of binding free energy decomposition revealed a van der Waals interaction between two ligands that may play a key role in nucleophilic addition reaction. This work will be a good starting point for further determination of the biological role of cytosolic insect theta class GSTs and will aid the design of structure-based inhibitors.

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Acknowledgments

This work is supported by Natural Science Foundation of China (Grant Nos. 21273095, 20903045 and 21203072).

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Authors and Affiliations

  1. State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun, 130023, Jilin, People’s Republic of China

    Yan Wang, Qing-Chuan Zheng, Ji-Long Zhang, Ying-Lu Cui, Qiao Xue & Hong-Xing Zhang

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  1. Yan Wang
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  2. Qing-Chuan Zheng
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  3. Ji-Long Zhang
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  4. Ying-Lu Cui
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  5. Qiao Xue
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Correspondence to Qing-Chuan Zheng or Hong-Xing Zhang.

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Wang, Y., Zheng, QC., Zhang, JL. et al. Highlighting a π–π interaction: a protein modeling and molecular dynamics simulation study on Anopheles gambiae glutathione S-transferase 1-2. J Mol Model 19, 5213–5223 (2013). https://doi.org/10.1007/s00894-013-2009-3

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  • DOI: https://doi.org/10.1007/s00894-013-2009-3

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