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Relevant academic research and scientific papers

Design of a binuclear Ni(II)-iminodiacetic acid (IDA) complex for selective recognition and covalent labeling of His-tag fused proteins

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 binding affinity (Kd = 24 nM), the value of which is 16-fold higher than the conventional Ni(II)-NTA complex (Kd = 390 nM). The strong binding affinity of the Ni(II)-IDA complex was successfully used in the covalent labeling and fluorescence bioimaging of a His-tag fused GPCR (G-protein coupled receptor) located on the surface of living cells.