Design, syntheses, and kinetic evaluation of 3-(phenylamino)oxazolidine-2,4-diones as potent cytochrome bc1 complex inhibitors
作者:Fu Wang、Hui Li、Le Wang、Wen-Chao Yang、Jia-Wei Wu、Guang-Fu Yang
DOI:10.1016/j.bmc.2011.06.008
日期:2011.8
The cytochrome bc(1) complex (EC 1.10.2.2, bc(1)) is one of the most promising targets for new drugs and agricultural fungicides. Among the existing bc(1) complex inhibitors specifically binding to the Q(o) site, oxazolidinedione derivatives have attracted great attention. With the aim to understand the substituent effects of oxazolidinedione derivatives on the inhibition activity against the bc(1) complex, a series of new oxazolidinedione derivatives were designed, synthesized, and biologically evaluated. The further inhibitory kinetics studies against porcine succinate-cytochrome c reductase (SCR) revealed that the representative compound 8d and famoxadone are both non-competitive inhibitors with respect to the substrate cytochrome c, but competitive inhibitors with respect to substrate decylubiquinol (DBH2). In addition, compound 8d and famoxadone showed, respectively, 35-fold and 15-fold greater inhibitory activity against the porcine SCR than the porcine bc(1) complex, indicating that these two inhibitors not only inhibited the activity of the bc(1) complex, but possibly affect the interaction between the complex II and the bc(1) complex. To our knowledge, this is the first report that famoxadone and its analogs have effects on the interaction between the complex II and the bc(1) complex. (C) 2011 Elsevier Ltd. All rights reserved.