The present disclosure provides compositions and methods of use thereof for labeling peptide and proteins in vitro or in vivo. The methods described herein employ lipoic acid ligase or mutants thereof, and lipoic acid analogs (e.g., lipoic acid analogs comprising a resorufin moiety) recognized by lipoic acid ligase and lipoic acid ligase mutants. Also provided herein is a method of imaging protein-protein interaction via a reaction mediated by lipoic acid ligase.
本公开提供了用于在体外或体内标记肽和蛋白质的组成物及其使用方法。所述方法采用
丙酸酸化酶或其突变体,以及
丙酸酸化酶和
丙酸酸化酶突变体所识别的
丙酸类似物(例如,包含resorufin部分的
丙酸类似物)。此外,还提供了一种通过
丙酸酸化酶介导的反应来成像蛋白质-蛋白质相互作用的方法。