Double-hexahistidine tag with high-affinity binding for protein immobilization, purification, and detection on ni-nitrilotriacetic acid surfaces

Analytical Chemistry
Farid KhanMichael J Taussig

Abstract

There is a particular need in protein analysis and purification for specific, functional, and generic methods of protein immobilization on solid supports. Here we describe a double-hexahistidine (His6) tag sequence, comprising two hexahistidines separated by an 11-amino acid spacer, which shows at least 1 order of magnitude stronger binding to Ni-NTA-modified surfaces than a conventional single-His6 tag or two single-His6 tags at N- and C-termini. Using, as a model, tagged versions of green fluorescent protein (GFP), stable and tight binding of the double-His6 tag/Ni-NTA interaction was demonstrated by competitive elution from Ni-NTA agarose beads, surface plasmon resonance on a Ni-NTA chip, and ELISA in Ni-NTA microwell plates. Protein purification by Ni-NTA chromatography was improved by a 6-8-fold increase in imidazole concentration required for elution, while the dissociation rate of double-His6 GFP from Ni-NTA chips in SPR (BIAcore) was 10 times slower than for single-His6-tagged proteins. ELISA assays and protein microarrays constructed with double-His6 GFP demonstrated greater detection sensitivity with anti-His antibodies and Ni-NTA conjugates. Moreover, the double-His6 tag could serve simultaneously both for protein im...Continue Reading

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