Porcine pancreatic alpha-amylase (PPA) (PPA)

Porcine pancreatic alpha-amylase (PPA) is a calcium-dependent metalloenzyme that plays a central role in the digestion of dietary carbohydrates by catalyzing the hydrolysis of alpha-1,4-glycosidic linkages in starch and glycogen (UniProt: P00690). It is a member of the glycosyl hydrolase family 13 and is secreted by the pancreas into the small intestine (PubMed: 22403532). Due to its high structural similarity to human pancreatic alpha-amylase, PPA is widely used as a model enzyme in pharmacological research to identify inhibitors for managing metabolic disorders (PubMed: 25101539). In the context of type 2 diabetes mellitus, inhibiting this enzyme slows the breakdown of complex sugars, thereby flattening the postprandial glucose curve and improving glycemic control (StatPearls: Acarbose). Drugs such as acarbose and various natural inhibitors like phaseolamin target this enzyme to reduce the glycemic index of meals (PubChem: CID 41774). However, the clinical use of such inhibitors is often limited by gastrointestinal side effects, including flatulence and diarrhea, caused by the bacterial fermentation of undigested carbohydrates in the colon (PubMed: 15113718).

Other names

Alpha-amylase 11,4-alpha-D-glucan glucanohydrolasePancreatic amylasePPAA

Competitive inhibition of the enzyme's active site to delay the hydrolysis of complex carbohydrates into absorbable monosaccharides.