3vyv is a 2 chain structure with sequence from Bacillus subtilis subsp. natto. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
SUBN_BACNA Subtilisin is an extracellular alkaline serine protease, it catalyzes the hydrolysis of proteins and peptide amides. Subtilisin NAT also has fibrinolytic activity.