Mercaptoacetate thioesters and their hydrolysate mercaptoacetic acids jointly inhibit metallo-β-lactamase L1
作者:Cheng Chen、Yang Xiang、Ya Liu、Xiangdong Hu、Ke-Wu Yang
DOI:10.1039/c8md00091c
日期:——
specifically inhibited L1, exhibiting IC50 values ranging from 0.17 to 1.2 μM, and 8 was found to be the best inhibitor (IC50 = 0.17 μM). These thioesters restored the antimicrobial activity of cefazolin against E. coli expressing L1 by 2–4-fold. UV-vis monitoring showed that 1, 8 and 9 were unhydrolyzed in Tris buffer (pH 6.0–8.5), but hydrolyzed by L1; further HPLC monitoring indicated that 1/3 of the
由包括L1在内的金属β-内酰胺酶(MβLs)引起的“超级细菌”感染已成为一种新兴威胁。为了探究巯基乙酸硫酯抑制L1是硫酯本身或其水解产物的贡献,合成了十种巯基乙酸硫酯1-10,它们特异性地抑制了L1,IC 50值在0.17至1.2μM范围内,发现有8种是IC 50值。最佳抑制剂(IC 50 = 0.17μM)。这些硫酯使头孢唑啉对表达L1的大肠杆菌的抗菌活性恢复了2-4倍。的UV-vis监测表明,1,8和9在Tris缓冲液(pH 6.0-8.5)中未水解,但被L1水解。进一步的HPLC监测表明1/3的硫酯9被转化为巯基乙酸。STD-NMR监测表明,硫酯及其水解产物巯基乙酸共同抑制L1。