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Zampanolide, a potent new microtubule stabilizing agent, covalently reacts with the taxane luminal site in both tubulin alpha-beta-heterodimers and microtubules

AuthorsField, Jessica J.; Pera, Benet ; Calvo, Enrique; Canales, Ángeles ; Zurwerra, Didier; Trigili, Chiara ; Rodríguez-Salarichs, Javier; Matesanz, Ruth ; Kanakkanthara, Arun; Wakefield, St. John; Singh, A. Jonathan; Jiménez-Barbero, Jesús ; Northcote, Peter; Miller, John H.; López, Juan Antonio; Hamel, Ernest; Barasoain, Isabel ; Altmann, Karl-Heinz; Díaz, José Fernando
Issue Date22-Jun-2012
CitationChemistry and Biology 19(6):686–698(2012)
AbstractZampanolide and its less active analog dactylolide compete with paclitaxel for binding to microtubules and represent a new class of microtubule-stabilizing agent (MSA). Mass spectrometry demonstrated that the mechanism of action of both compounds involved covalent binding to β-tubulin at residues N228 and H229 in the taxane site of the microtubule. Alkylation of N228 and H229 was also detected in α,β-tubulin dimers. However, unlike cyclostreptin, the other known MSA that alkylates β-tubulin, zampanolide was a strong MSA. Modeling the structure of the adducts, using the NMR-derived dactylolide conformation, indicated that the stabilizing activity of zampanolide is likely due to interactions with the M-loop. Our results strongly support the existence of the luminal taxane site of microtubules in tubulin dimers and suggest that microtubule nucleation induction by MSAs may proceed through an allosteric mechanism
Description13 páginas, 3 figuras, 1 tabla -- PAGS nros. 686-698
Publisher version (URL)http://dx.doi.org/10.1016/j.chembiol.2012.05.008
Appears in Collections:(CIB) Artículos
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