Chemical labeling of proteins with synthetic molecular probes offers the possibility to probe the functions of proteins of interest in living cells. However, the methods for covalently labeling targeted proteins using complementary peptide tag-probe pairs are still limited, irrespective of the versatility of such pairs in biological research. Herein, we report the new CysHis tag-Ni(II) probe pair for the specific covalent labeling of proteins. A broad-range evaluation of the reactivity profiles of the probe and the CysHis peptide tag afforded a tag-probe pair with an optimized and high labeling selectivity and reactivity. In particular, the labeling specificity of this pair was notably improved compared to the previously reported one. This pair was successfully utilized for the fluorescence imaging of membrane proteins on the surfaces of living cells, demonstrating its potential utility in biological research.
使用合成分子探针对蛋白质进行
化学标记,提供了在活细胞中探测目标蛋白质功能的可能性。然而,尽管这种标记对
生物研究非常灵活,利用互补肽标签-探针对共价标记目标蛋白的方法仍然有限。在此,我们报告了一种新的CysHis标签-Ni(II)探针对,用于特异性的共价标记蛋白质。对该探针和CysHis肽标签的反应性进行广泛评估,获得了一对优化后的高标记选择性和反应性的标签-探针对。特别是,与先前报道的标记对相比,这对的标记特异性显著提高。该对成功用于对活细胞表面膜蛋白的
荧光成像,展示了其在
生物研究中的潜在应用。