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Expressed protein ligation (EPL), using non-self-cleaving inteins, allows for the site-specific addition of customized chemical moieties to the termini of proteins. In this way, protein activity can be preserved while functionalizing the target protein with a wide range of chemical handles. Here, we describe methods for EPL-based modification of proteins produced by yeast, employing an engineered, non-self-cleaving intein known as 202-08. Methods for EPL modification of both yeast surface displayed and secreted proteins with bioorthogona