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C-7 Modified Flavonoids As Novel Tyrosyl-tRNA Synthetase Inhibitors

Zhu-Ping Xiao, W. Wei, Qi Liu, Peng-Fei Wang, Xingdan Luo, Fangyuan Chen, Yang Cao, Hong Huang, Mimi Liu, Hai-Liang Zhu
Published 2017 · Chemistry

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Twenty C-7 modified flavonoids were designed and synthesized. Biological evaluation in vitro indicated that compounds generated by SYBYL-X with high scores also showed good inhibitory activities against TyrRS. Compounds containing the nargenin core exhibit better enzyme inhibitory activities than other flavonoid cores, with (S)-5-hydroxy-4′-hydroxy-7-(2-morpholino-2-oxoethoxy)-2,3-dihydroflavone (b1) being the most active (IC50 = 0.10 ± 0.01 μM) in all assayed compounds. All compounds were also assayed for antimicrobial activities against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa, and b1 also displayed excellent activity, showing 6-fold more potent than the marketed antibiotic ciprofloxacin. In comparison with Gram-positive organism, all these derivatives exhibited better activity against Gram-negative organism, and did not displayed significant differences between the two assayed Gram-negative strains (E. coli ATCC 8739 and P. aeruginosa ATCC 9027).
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