Taccalonolide C-6 Analogues, Including Paclitaxel Hybrids, Demonstrate Improved Microtubule Polymerizing Activities.

Taccalonolide C-6 Analogues, Including Paclitaxel Hybrids, Demonstrate Improved Microtubule Polymerizing Activities.
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DOI:
10.1021/acs.jnatprod.1c00211
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发表时间:
2021-06-25
影响因子:
5.1
通讯作者:
Du L
Du L
中科院分区:
生物学2区
文献类型:
--
作者:
Risinger AL;Hastings SD;Du L

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The C-22,23-epoxy taccalonolides are microtubule stabilizers that bind covalently to β-tubulin with a high degree of specificity. We semi-synthesized and performed biochemical and cellular evaluations on twenty taccalonolide analogues designed to improve target engagement. Most notably, modification of C-6 on the taccalonolide backbone with the C-13 N-acyl-β-phenylisoserine side chain of paclitaxel provided compounds with 10-fold improved potency for biochemical tubulin polymerization as compared to the unmodified epoxy taccalonolide AJ. Covalent docking demonstrated the C-13 paclitaxel side chain occupied a binding pocket adjacent to the core taccalonolide pocket near the M-loop of β-tubulin. Although paclitaxel-taccalonolide hybrids demonstrated improved in vitro biochemical potency, they retained features of the taccalonolide chemotype, including a lag in tubulin polymerization and high degree of cellular persistence after drug washout associated with covalent binding. Together, these data demonstrate C-6 modifications can improve the target engagement of this covalent class of microtubule drugs without substantively changing their mechanism of action.
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