Pyrazolidine-3,5-diones and 5-Hydroxy-1<i>H</i>-pyrazol-3(2<i>H</i>)-ones, Inhibitors of UDP-<i>N</i>-acetylenolpyruvyl Glucosamine Reductase
作者:Adam M. Gilbert、Amedeo Failli、Jay Shumsky、Youjun Yang、Anatoly Severin、Guy Singh、William Hu、David Keeney、Peter J. Petersen、Alan H. Katz
DOI:10.1021/jm060499t
日期:2006.10.1
A series of pyrazolidine-3,5-dione and 5-hydroxy-1H-pyrazol-3(2H)-one inhibitors of Escherichia coli UDP-N-acetylenolpyruvyl glucosamine reductase (MurB) has been prepared. The 5-hydroxy-1H-pyrazol-3(2H)ones show low micromolar IC50 values versus E. coli MurB and submicromolar minimal inhibitory concentrations ( MIC) against Staphylococcus aureus GC 1131, Enterococcus faecalis GC 2242, Streptococcus pneumoniae GC 1894, and E. coli GC 4560 imp, a strain with increased outer membrane permeability. None of these compounds show antimicrobial activity against Candida albicans, a marker of eukaryotic toxicity. Moreover, these compounds inhibit peptidoglycan biosynthesis, as assessed by measuring the amount of soluble peptidoglycan produced by Streptococcus epidermidis upon incubation with compounds. A partial least squares projection to latent structures analysis shows that improving MurB potency and MIC values correlate with increasing lipophilicity of the C-4 substituent of the 5-hydroxy-1H-pyrazol-3(2H)-one core. Docking studies using FLO and PharmDock produced several binding orientations for these molecules in the MurB active site.