Identification of C-6 as a New Site for Linker Conjugation to the Taccalonolide Microtubule Stabilizers

Journal of Natural Products
Lin DuSusan L Mooberry

Abstract

The taccalonolides are a class of microtubule stabilizers that circumvent clinically relevant forms of drug resistance due to their unique mechanism of microtubule stabilization imparted by the covalent binding of the C-22-C-23 epoxide moiety to tubulin. A taccalonolide (8) with a fluorescein group attached with a linker at C-6 was generated, and biochemical and cell-based assays showed that it bound directly to tubulin and stabilized microtubules. This pharmacological probe has allowed, for the first time, a direct visualization of a taccalonolide binding to microtubules, verifying their cellular binding site. This C-6-modified taccalonolide showed potency comparable to the untagged compound in biochemical experiments; however, its potency was lower in cellular assays, presumably due to decreased cellular permeability. These studies provide a valuable tool to facilitate the further understanding of taccalonolide pharmacology and demonstrate that C-6 is a promising site for a linker to be added to this novel class of microtubule stabilizers for targeted drug delivery.

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Mar 18, 2017·Nature Reviews. Drug Discovery·Alain BeckNathalie Corvaïa
Jun 7, 2017·Nature Communications·Yuxi WangJinliang Yang

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Citations

Jun 4, 2019·Journal of Computer-aided Molecular Design·Pedro A Sánchez-MurciaFederico Gago
Jun 5, 2020·Artificial Cells, Nanomedicine, and Biotechnology·Hui Tian, Zhenkun He

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