Alpha-amylase enzyme (α-amylase (sometimes abbreviated as AAM or AMY))

Alpha-amylase is a calcium-dependent metalloenzyme that catalyzes the endohydrolysis of internal α-(1→4)-D-glucosidic linkages in large polysaccharides such as starch and glycogen, producing smaller sugars like maltose and dextrins.[5][6] It is widely distributed among living organisms; in humans it exists primarily as two isoenzymes—salivary alpha-amylase ("ptyalin") produced by salivary glands for initial carbohydrate digestion in the mouth, and pancreatic alpha-amylase secreted into the small intestine for further breakdown during digestion.[6][2] The enzyme has a characteristic three-domain structure with an eight-stranded α/β barrel catalytic domain containing key acidic residues essential for its function.[1][5] Alpha-amylases play a crucial role in nutrition by enabling efficient energy extraction from dietary carbohydrates. Clinically, serum amylase measurement serves as an important diagnostic marker for acute pancreatitis.[2] Pharmacologically, inhibition of this enzyme is targeted to manage postprandial hyperglycemia in diabetes mellitus through drugs like acarbose that competitively block its active site.[5][3]

Other names

4-α-D-glucan glucanohydrolasePtyalin (for salivary alpha-amylase)Pancreatic amylaseEC 3.2.1.1

Competitive inhibition of the active site to reduce enzymatic breakdown of dietary starches, thereby lowering postprandial blood glucose spikes