Subtilisin variants capable of cleaving substrates containing basic residues


Ontology type: sgo:Patent     


Patent Info

DATE

1998-11-17T00:00

AUTHORS

Marcus D. Ballinger , James A. Wells

ABSTRACT

The bacterial serine protease, subtilisin BPN', has been mutated so that it will efficiently and selectively cleave substrates containing basic residues. Combination mutants, where Asn 62 was changed to Asp, Gly 166 was changed to Asp (N62D/G166D), and optionally Tyr 104 was changed to Asp had a larger than additive shift in specificity toward substrates containing basic residues. Suitable substrates of the variant subtilisin were revealed by sorting a library of phage particles (substrate phage) containing five contiguous randomized residues. This method identified a particularly good substrate, Asn-Leu-Met-Arg-Lys- (SEQ ID NO: 35), that was selectively cleaved in the context of a fusion protein by the N62D/G166D subtilisin variant. A particularly good substrate for N62D/G166D/Y104D would be Asn-Arg-Met-Arg-Lys- (SEQ ID NO: 76). Accordingly, these variant subtilisin are useful for cleaving fusion proteins with basic substrate linkers and processing hormones or other proteins (in vitro or in vivo) that contain basic cleavage sites. More... »

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