Novel human lens metabolites from normal and cataractous human lenses
摘要:
4-(2-Aminophenyl)-4-oxobutanoic acid, 4-(2-amino-3-hydroxyphenyl)-4-oxobutanoic acid and glutathionyl-kynurenine have been identified as novel metabolites in normal and cataractous human lenses following total synthesis and comparison with authentic human lens samples. Their structures are consistent with those derived from the major human lens UV filters kynurenine and 3-hydroxykynurenine, and it is proposed that these compounds also play a role as UV filters. These metabolites were isolated in pmol/mg levels (dry mass) in lenses. 4-(2-Amino-3-hydroxyphenyl)-4-oxobutanoic acid and glutathionyl-kynurenine were found to be unstable at physiological pH. Other potential metabolites, glutathionyl-3-hydroxykynurenine, kynurenine yellow and 3-hydroxykynurenine yellow, were not detected in either normal or cataractous lenses. (c) 2007 Elsevier Ltd. All rights reserved.
[EN] N-(4-(PIPERAZIN-1-YL)-PHENYL-2-OXAZOLIDINONE-5-CARBOXAMIDE DERIVATES AND RELATED COMPOUNDS AS ANTIBACTERIAL AGENTS<br/>[FR] DERIVES DE N-(4-(PIPERAZINE-1-YL)-PHENYL-2-OXAZOLIDINONE-5-CARBOXAMIDES ET COMPOSES ASSOCIES SERVANT D'AGENTS ANTIBACTERIENS
申请人:UPJOHN CO
公开号:WO2004045616A1
公开(公告)日:2004-06-03
The present invention provides antibacterial agents having the formula I described herein. or-pharmaceutically acceptable salts thereof wherein: A is a structure i, ii, iii, or iv, W is N(H)C(X)-R,. Het, or -Y HET, in which the Hot or Y HET is optionally substituted with =S or '0, provided that when A is structure iv, W is not - Y--1-MT or Het;
A series of novel (E)-4-oxo-2-crotonamide derivatives were designed and synthesized to find potent antituberculosis agents. All the target compounds were evaluated for their in vitro activity against Mycobacterium tuberculosis H37Rv(MTB). Results reveal that 4-phenyl moiety at part A and short methyl group at part C were found to be favorable. Most of the derivatives displayed promising activity against
The first total synthesis of thiobutacin, a butanoic acid with antifungal activity recently isolated from the culture broth of a soil actinomycete, Lechevalieria aerocolonigenes strain VK-A9, is described. The five-step procedure involves readily available and cheap starting materials and can easily be transposed to the large scale. Fungal growth inhibition of thiobutacin is mediated by the pH of the
CoA Adducts of 4-Oxo-4-phenylbut-2-enoates: Inhibitors of MenB from the <i>M. tuberculosis</i> Menaquinone Biosynthesis Pathway
作者:Xiaokai Li、Nina Liu、Huaning Zhang、Susan E. Knudson、Huei-Jiun Li、Cheng-Tsung Lai、Carlos Simmerling、Richard A. Slayden、Peter J. Tonge
DOI:10.1021/ml200141e
日期:2011.11.10
A high-throughput screen led to the discovery of 2-amino-4-oxo-4-phenylbutanoate inhibitors of the 1,4-dihydroxy-2-naphthoyl-CoA synthase (MenB) from the menaquinone biosynthesis pathway in Mycobacterium tuberculosis. However, these compounds are unstable in solution and eliminate to form the corresponding 4-oxo-4-phenylbut-2-enoates that then react with CoA in situ to form nanomolar inhibitors of MenB. The potency of these compounds results from interaction of the CoA adduct carboxylate with the MenB oxyanion hole, a conserved structural motif in the crotonase superfamily. 4-Oxo-4-chlorophenylbutenoyl methyl ester has minimum inhibitory concentrations of 0.6 and 1.5 mu g/mL against replicating and nonreplicating M. tuberculosis, respectively, and it is proposed that the methyl ester penetrates the cell where it is hydrolyzed and reacts with CoA to generate the active antibacterial. The CoA adducts thus represent an important foundation for the development of novel MenB inhibitors and suggest a general approach to the development of potent inhibitors of acyl-CoA binding enzymes.
Inhibition of human cytomegalovirus protease by enedione derivatives of thieno[2,3-d]oxazinones through a novel dual acylation/alkylation mechanism
作者:Ivan L. Pinto、Richard L. Jarvest、Brian Clarke、Christine E. Dabrowski、Ashley Fenwick、Michele M Gorczyca、L.John Jennings、Patrick Lavery、Edmund J Sternberg、David G. Tew、Andrew West
DOI:10.1016/s0960-894x(99)00005-0
日期:1999.2
Enedione derivatives of thieno[2,3-d]oxazinones are nanomolar inhibitors of CMV protease which act through a novel dual acylation of the catalytic serine and alkylation of the protease cysteine 161 via a Michael addition to the enedione moiety of the inhibitor. (C) 1999 Elsevier Science Ltd. All rights reserved.