Methods and compositions for identifying a polynucleotide encoding a protease

摘要

Methods are disclosed whereby protease activity is directly linked to delivery of a transferable label to a target cell which expresses a protease, via fusion of viral display packages comprising the transferable label with the target cell. The methods can be used, inter alia, to identify proteases, including previously undiscovered proteases or variants of known proteases which may have altered substrate specificity.