Alpha-glucosidase

Alpha-glucosidase is a critical digestive enzyme located in the brush border of the small intestine, primarily represented by the complexes maltase-glucoamylase and sucrase-isomaltase [1][2]. Its primary biological function is to catalyze the final step of carbohydrate digestion by hydrolyzing terminal, non-reducing 1,4-linked alpha-glucose residues from oligosaccharides and disaccharides into absorbable glucose [2][3]. This process is a major determinant of the rate at which glucose enters the systemic circulation following a meal. In patients with type 2 diabetes mellitus, alpha-glucosidase serves as a therapeutic target to manage postprandial hyperglycemia [1][4]. Pharmacological inhibitors like acarbose and miglitol competitively bind to the enzyme's active site, slowing the breakdown of starches and sugars, which results in a more gradual rise in blood glucose levels [4][5]. However, the presence of undigested carbohydrates in the lower gastrointestinal tract often leads to side effects such as flatulence and osmotic diarrhea due to bacterial fermentation [1].

Other names

Intestinal alpha-glucosidaseMaltase-glucoamylaseSucrase-isomaltaseAlpha-D-glucosidaseGlucosidaseIntestinal/pancreatic alpha-glucosidase

Competitive inhibition of alpha-glucosidase enzymes in the brush border of the small intestine, which delays the hydrolysis of dietary carbohydrates into absorbable monosaccharides, thereby reducing the rate of glucose absorption and lowering postprandial blood glucose levels [1][4].