General compositions and methods for detecting Lipid I, Lipid II and peptidoglycan synthesis is disclosed. A method of screening for potential antibacterial agents is provided which requires bacterial membrane preparations or enriched enzyme preparations including at least one bacterial enzyme involved in the synthesis of Lipid I from UDP-MurNAc pentapeptide and undecaprenyl phosphate, at least one bacterial enzyme involved in the synthesis of Lipid II from Lipid I and UDP-GlcNAc and one or more bacterial enzymes involved in the further processing of Lipid II toward the downstream synthesis of peptidoglycan. The methods disclosed herein further provides a labeled UDP-MurNAc-peptide capable of serving as a substrate for a bacterial enzyme involved in the synthesis of Lipid I and a labeled UDP-GlcNAc capable of serving as a substrate for a bacterial enzyme involved in the synthesis of Lipid II. Conditions for further processing of Lipid II toward the downstream synthesis of peptidoglycan are also discribed.
公开了检测脂质 I、脂质 II 和肽聚糖合成的一般组合物和方法。本发明提供了一种筛选潜在抗菌剂的方法,该方法需要细菌膜制剂或富集
酶制剂,包括至少一种参与由
UDP-MurNAc 五肽和十一烯丙基
磷酸合成脂质 I 的细菌酶,至少一种参与由脂质 I 和
UDP-GlcNAc 合成脂质 II 的细菌酶,以及一种或多种参与脂质 II 向下游合成肽聚糖的进一步加工的细菌酶。本文公开的方法进一步提供了一种可作为参与脂质 I 合成的细菌酶底物的标记
UDP-MurNAc-肽和一种可作为参与脂质 II 合成的细菌酶底物的标记
UDP-GlcNAc。此外,还介绍了进一步加工脂质 II 以在下游合成肽聚糖的条件。