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In Vivo Biotinylation Of Antigens In E. Coli.

S. Gräslund, P. Savitsky, S. Müller-Knapp
Published 2017 · Medicine, Chemistry

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Site-specific biotinylation of proteins is often the method of choice to enable efficient immobilization of a protein on a surface without interfering with protein folding. The tight interaction of biotin and streptavidin is frequently used to immobilize an antigen during phage display selections of binders. Here we describe a method of in vivo biotinylation of proteins during expression in E. coli, by tagging the protein with the short biotin acceptor peptide sequence, Avi tag, and co-expression of the E. coli biotin ligase (BirA) resulting in precise biotinylation of a specific lysine residue in the tag.
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