Subtilisin is an extracellular enzyme secreted by Bacillus amyloliquefaciens and belongs to the alpha/beta subtilase family. It is a serine-class endoprotease, hydrolysing peptide bonds with broad specificity and a preference for a large uncharged residue in the P1 binding site.
Defined by 4 residues: ASP:A-32HIS:A-64ASN:A-155SER:A-221