Evaluation of two novel tag-based labelling technologies for site-specific modification of proteins

International Journal of Biological Macromolecules
Aline TiratLukas Leder

Abstract

Modern drug discovery strongly depends on the availability of target proteins in sufficient amounts and with desired properties. For some applications, proteins have to be produced with specific modifications such as tags for protein purification, fluorescent or radiometric labels for detection, glycosylation and phosphorylation for biological activity, and many more. It is well known that covalent modifications can have adverse effects on the biological activity of some target proteins. It is therefore one of the major challenges in protein chemistry to generate covalent modifications without affecting the biological activity of the target protein. Current procedures for modification mostly rely on non-specific labelling of lysine or cysteine residues on the protein of interest, but alternative approaches dedicated to site-specific protein modification are being developed and might replace most of the commonly used methodologies. In this study, we investigated two novel methods where target proteins can be expressed in E. coli with a fusion partner that allows protein modification in a covalent and highly selective manner. Firstly, we explored a method based on the human DNA repair protein O6-alkylguanine-DNA alkyltransferase ...Continue Reading

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