Porcine pancreatic elastase (PPE)

Porcine pancreatic elastase (PPE) is a serine protease enzyme produced in the pancreas of pigs (Sus scrofa), secreted in the intestine, and primarily responsible for the breakdown of elastin and other extracellular matrix proteins. It is a single polypeptide of about 240 amino acids and belongs to the chymotrypsin family of endopeptidases, sharing high sequence and structural homology with other serine proteases like trypsin and chymotrypsin[3][5][7]. PPE cleaves peptide bonds after small, neutral amino acids, with a unique ability to degrade native elastin[2][4]. It is widely used in research as a tool enzyme, particularly for inducing disease models such as emphysema or pancreatitis in rodents, and for screening protease inhibitors, including macrocyclic peptides like FR901451[6]. Despite frequent confusion in the literature, PPE is *not* present in humans and must be distinguished from human pancreatic elastase isoforms[10][1]. It is considered an important biochemical tool and reference serine protease for drug discovery and disease modeling.

Other names

Pancreatic elastase (when referring to porcine species)Elastase I (porcine/bovine)Serine protease elastaseEndopeptidase elastase

Competitive inhibition of the active site serine (as with FR901451, sivelestat, and related inhibitors)[6]; Noncompetitive allosteric inhibition (less common); General serine protease inhibition