Significance
This work establishes a fluorescence labeling method that can be used in living cells to derivatize specific proteins of interest with a small red fluorophore, resorufin. The method has extremely high sequence specificity and is based on a computationally designed fluorophore ligase, derived from
Escherichia coli
lipoic acid ligase. These results demonstrate the power of computational design to majorly reengineer enzyme specificity. Extensive screening of rationally designed enzyme mutants failed to achieve the same result.
这项工作建立了一种荧光标记方法,可在活细胞中使用,用小红色荧光素resorufin对感兴趣的特定蛋白进行衍生化。该方法具有极高的序列特异性,基于计算设计的荧光素连接酶,源自大肠杆菌硫辛酸连接酶。这些结果展示了计算设计在重塑酶特异性方面的强大能力。对经过合理设计的酶突变体进行广泛筛选未能达到相同结果。