Synthesis and biological evaluation of nannocystin analogues toward understanding the binding role of the (2R,3S)-Epoxide in nannocystin A
摘要:
Nannocystin A is a potent antiproliferative cyclodepsipeptide targeting eukaryotic translation elongation factor 1 alpha. To elucidate the binding role of its (2R,3S)-epoxide, we designed and synthesized a focused library of 10 nannocystin analogues. Variable temperature NMR experiments demonstrated the importance of the (2R,3S)-epoxide in controlling the macrocyclic conformation. Biological evaluation of these compounds against three typical cancer cell lines established a clear structure-activity relationship at the epoxide region, which was rationalized by comparing the superimposed conformations of different nannocystin analogues and in silico docking analysis. Our results showed that the (2R,3S)-epoxide of nannocystin A is mainly responsible for controlling the macrocyclic conformation, rather than binding directly to the target. (C) 2018 Elsevier Masson SAS. All rights reserved.
Abstract Continuing our investigation into the structure-activity relationship of antiproliferative macrocyclic nannocystins, we describe herein totalsynthesis of all four stereoisomers of Br-nannocystins as well as a simplified analogue varying at the polyketide C10 and C11 positions. Biological evaluation of these compounds against PANC1 cancer cell lines showed that both the (10R,11S) configuration
nannocystin analogues 3a–3j modified at the polyketide phenyl moiety was reported. These compounds were evaluated against three cancercelllines. Compared with the naturally occurring congener 3a, the other synthetic variants either preserved or lose antiproliferativeactivity at varying degrees. Moreover, the potentanalogues also displayed comparable levels of cytotoxicity toward two normal cell lines
Nannocystin A is a potent antiproliferative cyclodepsipeptide targeting eukaryotic translation elongation factor 1 alpha. To elucidate the binding role of its (2R,3S)-epoxide, we designed and synthesized a focused library of 10 nannocystin analogues. Variable temperature NMR experiments demonstrated the importance of the (2R,3S)-epoxide in controlling the macrocyclic conformation. Biological evaluation of these compounds against three typical cancer cell lines established a clear structure-activity relationship at the epoxide region, which was rationalized by comparing the superimposed conformations of different nannocystin analogues and in silico docking analysis. Our results showed that the (2R,3S)-epoxide of nannocystin A is mainly responsible for controlling the macrocyclic conformation, rather than binding directly to the target. (C) 2018 Elsevier Masson SAS. All rights reserved.