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Site-specific protein labeling via sortase-mediated transpeptidation.
Current Protocols in Protein Science 2009 April
Creation of functional protein bioconjugates demands methods for attaching a diverse array of probes to target proteins with high specificity, under mild conditions. The sortase A transpeptidase enzyme from Staphylococcus aureus catalyzes the cleavage of a short 5-aa recognition sequence (LPXTG) with the concomitant formation of an amide linkage between an oligoglycine peptide and the target protein. By functionalizing the oligoglycine peptide, it is possible to incorporate reporters into target proteins in a site-specific fashion. This reaction is applicable to proteins in solution and on the living cell surface. The method described in this unit only requires incubation of the target protein, which has been engineered to contain a sortase recognition site either at the C terminus or within solvent-accessible loops, with a purified sortase enzyme and a suitably functionalized oligoglycine peptide.
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