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Generation of Ca2+-independent sortase A mutants with enhanced activity for protein and cell surface labeling
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Generation of Ca2+-independent sortase A mutants with enhanced activity for protein and cell surface labeling
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Journal Article
Generation of Ca2+-independent sortase A mutants with enhanced activity for protein and cell surface labeling
2017
Overview
Sortase A, a calcium-dependent transpeptidase derived from Staphylococcus aureus, is used in a broad range of applications, such as the conjugation of fluorescent dyes and other moieties to proteins or to the surface of eukaryotic cells. In vivo and cell-based applications of sortase have been somewhat limited by the large range of calcium concentrations, as well as by the often transient nature of protein-protein interactions in living systems. In order to use sortase A for cell labeling applications, we generated a new sortase A variant by combining multiple mutations to yield an enzyme that was both calcium-independent and highly active. This variant has enhanced activity for both N- and C-terminal labeling, as well as for cell surface modification under physiological conditions.
