Abstract
Many natural products target mammalian tubulin but only a few can form a covalent bond and hence irreversibly affect microtubule function. Among them, zampanolide (ZMP) and taccalonolide AJ (TAJ) stand out, not only because they are very potent antitumor agents but also because the adducts they form with β-tubulin have been structurally characterized in atomic detail. By applying model building techniques, molecular orbital calculations, molecular dynamics simulations and hybrid QM/MM methods, we have gained insight into the 1,2- and 1,4-addition reactions of His229 and Asp226 to ZMP and TAJ, respectively, in the taxane-binding site of β-tubulin. The experimentally inaccessible precovalent complexes strongly suggest a water-mediated proton shuttle mechanism for ZMP adduct formation and a direct nucleophilic attack by the carboxylate of Asp226 on C22 of the C22R,C23R epoxide in TAJ. The M-loop, which is crucially important for interprotofilament interactions, is structured into a short helix in both types of complexes, mostly as a consequence of the fixation of the phenol ring of Tyr283 and the guanidinium of Arg284. As a side benefit, we obtained evidence supporting the existence of a commonly neglected intramolecular disulfide bond between Cys241 and Cys356 in β-tubulin that contributes to protein compactness and is absent in the βIII isotype associated with resistance to taxanes and other drugs.
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Abbreviations
- DFTB:
-
Density functional-based tight-binding
- MM-ISMSA:
-
Molecular mechanics-implicit solvent model surface area
- QM/MM:
-
Quantum mechanics/molecular mechanics
- sMD:
-
Steered molecular dynamics
- uMD:
-
Unrestrained molecular dynamics
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Acknowledgements
We are grateful to Prof. Susan L. Mooberry (University of San Antonio, TX, USA) and Prof. Wei-shuo Fang (University of Beijing, China) for encouragement and helpful discussions.
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Financial support from the Spanish Ministerio de Economía y Competitividad (SAF2015-64629-C2-2-R) and PharmaMar S.A.U. is gratefully acknowledged.
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Participated in research design: PAS-M and FG. Conducted experiments: PAS-M, AM, and FG. Contributed new analytic tools: AC-C. Performed data analysis: PAS-M, AM, AC-C, and FG. Wrote the manuscript: PAS-M and FG.
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Sánchez-Murcia, P.A., Mills, A., Cortés-Cabrera, Á. et al. Unravelling the covalent binding of zampanolide and taccalonolide AJ to a minimalist representation of a human microtubule. J Comput Aided Mol Des 33, 627–644 (2019). https://doi.org/10.1007/s10822-019-00208-w
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DOI: https://doi.org/10.1007/s10822-019-00208-w