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Modeling The Yew Tree Tubulin And A Comparison Of Its Interaction With Paclitaxel To Human Tubulin

J. Tuszynski, T. Craddock, Jonathan Y. Mane, K. Barakat, C. Tseng, M. Gajewski, P. Winter, L. Alisaraie, Jordan Patterson, E. Carpenter, Weiwei Wang, M. Deyholos, Linji Li, Xiao Sun, Y. Zhang, G. Wong
Published 2012 · Biology, Medicine

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ABSTRACTPurposeTo explore possible ways in which yew tree tubulin is naturally resistant to paclitaxel. While the yew produces a potent cytotoxin, paclitaxel, it is immune to paclitaxel’s cytotoxic action.MethodsTubulin sequence data for plant species were obtained from Alberta 1000 Plants Initiative. Sequences were assembled with Trinity de novo assembly program and tubulin identified. Homology modeling using MODELLER software was done to generate structures for yew tubulin. Molecular dynamics simulations and molecular mechanics Poisson–Boltzmann calculations were performed with the Amber package to determine binding affinity of paclitaxel to yew tubulin. ClustalW2 program and PHYLIP package were used to perform phylogenetic analysis on plant tubulin sequences.ResultsWe specifically analyzed several important regions in tubulin structure: the high-affinity paclitaxel binding site, as well as the intermediate binding site and microtubule nanopores. Our analysis indicates that the high-affinity binding site contains several substitutions compared to human tubulin, all of which reduce the binding energy of paclitaxel.ConclusionsThe yew has achieved a significant reduction of paclitaxel’s affinity for its tubulin by utilizing several specific residue changes in the binding pocket for paclitaxel.
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