Subtilisin variants capable of cleaving substrates containing di

Chemistry: molecular biology and microbiology – Micro-organism – tissue cell culture or enzyme using process... – Enzymatic production of a protein or polypeptide

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435 691, 4351723, 435221, 435222, 4352523, 43525231, 4353201, 536 232, C12P 2100, C12N 954, C12N 956, C12N 1557

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057416648

ABSTRACT:
The bacterial serine protease, subtilisin BPN', has been mutated so that it will efficiently and selectively cleave substrates containing dibasic residues. A combination mutant, where Asn 62 was changed to Asp and Gly 166 was changed to Asp (N62D/G166D), had a larger than additive shift in specificity toward dibasic substrates. 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-, that was selectively cleaved in the context of a fusion protein by the N62D/G166D subtilisin variant. Accordingly, this variant subtilisin may be useful for cleaving fusion proteins with dibasic substrate linkers and processing hormones or other proteins (in vitro or in vivo) that contain dibasic cleavage sites.

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