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Structural insight into the role of Gln293Met mutation on the Peloruside A/Laulimalide association with αβ-tubulin from molecular dynamics simulations, binding free energy calculations and weak interactions analysis

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Abstract

Peloruside A (PLA) and Laulimalide (LAU) are novel microtubule-stabilizing agents with promising properties against different cancer types. These ligands share a non-taxoid binding site at the outer surface of β-tubulin and promote microtubule stabilization by bridging two adjacent αβ-tubulin dimers from parallel protofilaments. Recent site-directed mutagenesis experiments confirmed the existence of a unique β-tubulin site mutation (Gln293Met) that specifically increased the activity of PLA and caused resistance to LAU, without affecting the stability of microtubules in the absence of the ligands. In this work, fully atomistic molecular dynamics simulations were carried out to examine the PLA and LAU association with native and mutated αβ-tubulin in the search for structural and energetic evidence to explain the role of Gln293Met mutation on determining the activity of these ligands. Our results revealed that Gln293Met mutation induced the loss of relevant LAU–tubulin contacts but exerted negligible changes in the interaction networks responsible for PLA–tubulin association. Binding free energy calculations (MM/GBSA and MM/PBSA), and weak interaction analysis (aNCI) predicted an increased affinity for PLA, and a weakened association for LAU after mutation, thus suggesting that Gln293Met mutation exerts its action by a modulation of drug–tubulin interactions. These results are valuable to increase understanding about PLA and LAU activity and to assist the future design of novel agents targeting the PLA/LAU binding pocket.

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Acknowledgements

The authors thank FONDECYT Grant No. 1160060.

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Authors and Affiliations

  1. Departamento de Químicas, Facultad de Ciencias Exactas, Universidad Andres Bello, Sede Concepción, Autopista Concepción-Talcahuano 7100, Talcahuano, Chile

    Matías A. Zúñiga, Gonzalo A. Jaña & Verónica A. Jiménez

  2. Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad de Concepción, Casilla 160-C, Concepción, Chile

    Joel B. Alderete

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  1. Matías A. Zúñiga
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Correspondence to Matías A. Zúñiga or Verónica A. Jiménez.

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Zúñiga, M.A., Alderete, J.B., Jaña, G.A. et al. Structural insight into the role of Gln293Met mutation on the Peloruside A/Laulimalide association with αβ-tubulin from molecular dynamics simulations, binding free energy calculations and weak interactions analysis. J Comput Aided Mol Des 31, 643–652 (2017). https://doi.org/10.1007/s10822-017-0029-2

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  • DOI: https://doi.org/10.1007/s10822-017-0029-2

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