and 1f-j resulted in a reduction in MIC against P. aeruginosa. Docking studies revealed that 1a, 1c, and 1d fit tightly into the substrate binding site of CphA as a proxy for ImiS with the aromatic carboxylate forming interactions with Lys224, the Zn(II) ion, the backbone of Asn233, and hydrophobic portions of the inhibitors aligning with hydrophobic patches of the protein surface.
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B
L21(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,