Design of a binuclear Ni(II)–iminodiacetic acid (IDA) complex for selective recognition and covalent labeling of His-tag fused proteins
作者:Ikuko Takahira、Hirokazu Fuchida、Shigekazu Tabata、Naoya Shindo、Shohei Uchinomiya、Itaru Hamachi、Akio Ojida
DOI:10.1016/j.bmcl.2014.04.096
日期:2014.7
Selective protein labeling with a small molecular probe is a versatile method for elucidating protein functions under live-cell conditions. In this Letter, we report the design of the binuclear Ni(II)–iminodiacetic acid (IDA) complex for selective recognition and covalent labeling of His-tag-fused proteins. We found that the Ni(II)–IDA complex 1-2Ni(II) binds to the His6-tag (HHHHHH) with a strong
用小分子探针进行选择性蛋白质标记是阐明活细胞条件下蛋白质功能的通用方法。在这封信中,我们报告了双核Ni(II)-亚氨基二乙酸(IDA)复合物的设计,该复合物用于选择性识别和共价标记His-tag融合蛋白。我们发现,Ni(II)–IDA配合物1 -2Ni(II)以很强的结合亲和力(K d = 24 nM)与His6-tag(HHHHHH)结合,其值比H(-)高16倍。常规Ni(II)–NTA络合物(K d = 390 nM)。Ni(II)-IDA复合物的强结合亲和力已成功用于位于活细胞表面的His-tag融合GPCR(G蛋白偶联受体)的共价标记和荧光生物成像。