title: Specificity of elastases: degradation of the oxidized beta-chain of insulin by porcine pancreatic elastase II and dog leucocyte elastase.
abstract: Porcine elastase II (EC 3.4.21.-), a pancreatic proteinase with elastolytic activity, hydrolyses the oxidized beta-chain of insulin with major cleavages occurring at Leu17-Val18, Phe24-Phe25, Phe25-Tyr26 and Tyr26-Thr27. Canine leucocytic elastase splits the same substrate with major sites at Val12-Glu13 and Val18-Cys19 O3H. This indicates similarity of elastase II to chymotrypsins (EC 3.4.21.1 or 3.4.21.2) and of dog leucocyte enzyme to human granulocyte elastase and porcine pancreatic elastase I (EC 3.4.21.11).
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D004285:Dogs; D007328:Insulin / Q000378:metabolism*; D007962:Leukocytes / Q000201:enzymology*; D046911:Macromolecular Substances; D010179:Pancreas / Q000201:enzymology*; D010196:Pancreatic Elastase / Q000378:metabolism*; D013379:Substrate Specificity
chemical_list: D007328:Insulin; D046911:Macromolecular Substances; D010196:Pancreatic Elastase