构建了一种新的支架,偶氮基硫代乙酰胺,并针对金属β-内酰胺酶(MbetaLs)进行了分析。获得的分子特异性抑制MbetaL ImiS,发现1c是最有效的抑制剂,使用亚胺培南作为底物的K i = 1.2μM。结构-活性关系表明,芳族羧基改善了抑制剂的抑制活性,而脂族羧基却没有。化合物1c-d和1h-i对产生CcrA或ImiS的大肠杆菌BL21(DE3)细胞显示出最佳的抗菌活性,分别导致MIC值降低了32倍和8倍。1c和1f-j导致针对铜绿假单胞菌的MIC降低。对接研究表明1a,1c和1d紧密配合CphA的底物结合位点,作为ImiS的代理,芳香族羧酸盐与Lys224形成相互作用,
3-Mercapto-1,2,4-triazoles and N-acylated thiosemicarbazides as metallo-β-lactamase inhibitors
作者:Faridoon、Waleed M. Hussein、Peter Vella、Nazar Ul Islam、David L. Ollis、Gerhard Schenk、Ross P. McGeary
DOI:10.1016/j.bmcl.2011.10.116
日期:2012.1
The production of beta-lactamases is an effective strategy by which pathogenic bacteria can develop resistance against beta-lactam antibiotics. While inhibitors of serine-beta-lactamases are widely used in combination therapy with b-lactam antibiotics, there are no clinically available inhibitors of metallo-beta-lactamases (MBLs), and so there is a need for the development of such inhibitors. This work describes the optimisation of a lead inhibitor previously identified by fragment screening of a compound library. We also report that thiosemicarbazide intermediates in the syntheses of these compounds are also moderately potent inhibitors of the IMP-1 MBL from Pseudomonas aeruginosa. The interactions of these inhibitors with the active site of IMP-1 were examined using in silico methods. (C) 2011 Elsevier Ltd. All rights reserved.