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The Binding Mode of Epothilone A on α,ß-Tubulin by Electron Crystallography

Science  06 Aug 2004:
Vol. 305, Issue 5685, pp. 866-869
DOI: 10.1126/science.1099190

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Abstract

The structure of epothilone A, bound to α,β-tubulin in zinc-stabilized sheets, was determined by a combination of electron crystallography at 2.89 angstrom resolution and nuclear magnetic resonance–based conformational analysis. The complex explains both the broad-based epothilone structure-activity relationship and the known mutational resistance profile. Comparison with Taxol shows that the longstanding expectation of a common pharmacophore is not met, because each ligand exploits the tubulin-binding pocket in a unique and independent manner.

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