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Free keywords:
His-tag; cobalt; kinetics; nitrilotriacetic acid; protein modification
Abstract:
Don't let go! The Co(3+)-mediated interaction between nitrilotriacetic acid (NTA) and the His6-tag is so stable and inert towards ligand exchange that it has a half-life of 7 days in the presence of imidazole and survives even under strongly chelating as well as reducing conditions, unlike the commonly used Ni(2+) or Co(2+) complexes. Possible applications include the separation of labeled proteins and the stable immobilization of proteins on surfaces.