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Subtilisin 72, a serine proteinase secreted by Bac. subtilis strain 72 was purified by covalent chromatography on Sepharose sorbent containing p-(omega-aminomethyl)phenylboronic acid as a ligand. The homogeneity of subtilisin 72 was confirmed by isoelectrofocusing in a thin layer of polyacrylamide gel (pl 8.6). The amino acid composition of this enzyme is different from that of other subtilisins, e. g. subtilisin Carlsberg. The N = terminal amino acid sequence of subtilisin 72 traced up to the 35th residue turned to be the same as that of subtilisin Carlsberg with the exception of the 21st (Tyr) and the 30th (Ile) residues. This very pronounced extent of homology shows that subtilisin 72 is very similar although not identical to subtilisin Carlsberg.
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