Aminoacyl analogs of chloramphenicol: examination of the kinetics of inhibition of peptide bond formation
作者:Denis Drainas、Petros Mamos、Charalambos Coutsogeorgopoulos
DOI:10.1021/jm00075a008
日期:1993.11
Two aminoacyl analogs and one peptidyl analog of chloramphenicol (1, Cl2CHCO-CA) were prepared. These are 2 (L-Phe-CA), 3 (Gly-CA), and 4 (L-Phe-Gly-CA). The kinetics of inhibition of peptide bond formation by these analogs were examined in a cell-free system which was derived from E. coli and used previously for the study of 1 (Drainas; et al. Eur. J. Biochem. 1987, 164, 53-58). In the absence of
制备了氯霉素的两个氨基酰基类似物和一个肽基类似物(1,Cl2CHCO-CA)。它们是2(L-Phe-CA),3(Gly-CA)和4(L-Phe-Gly-CA)。在源自大肠杆菌的无细胞系统中检查了这些类似物抑制肽键形成的动力学,该系统先前已用于研究1(Drainas; et al.Eur.J.Biochem.1987,164, 53-58)。在没有抑制剂的情况下,反应在整个反应过程中遵循一级动力学。在类似物存在下,反应给出双相对数-时间图。分析与图的初始斜率有关的动力学信息(初始斜率分析)。该信息将类似物与母体化合物1区分开。增加1的浓度将抑制从竞争性变为混合性非竞争性(Drainas;等人,Eur.J.Biochem.1987,164,53-58)。相反,即使在抑制剂的高浓度下,类似物也能提供竞争动力学。确定了以下Ki值:2为18.0 microM,3为5.5 microM,4为1.5 m