Alpha-glucosidase enzyme (specifically, maltase-glucoamylase or sucrase-isomaltase) in intestinal brush border cells (None universally; sometimes abbreviated as MGAM (for maltase-glucoamylase) or SI (sucrase-isomaltase))

Alpha-glucosidase is a family of enzymes located in the brush border membrane of small intestinal epithelial cells, primarily comprising maltase-glucoamylase and sucrase-isomaltase[1][2][4]. These enzymes hydrolyze terminal, non-reducing α-1,4-linked D-glucose residues from oligosaccharides and disaccharides, releasing free glucose for absorption[2][6]. Inhibition of these enzymes delays carbohydrate digestion, resulting in lower postprandial blood glucose levels, making them prominent targets for oral antidiabetic drugs, such as acarbose, miglitol, and voglibose[6]. Genetic defects or reduced activity in these enzymes can lead to inherited or functional disorders of carbohydrate digestion and absorption, such as congenital sucrase-isomaltase deficiency and malabsorption-based IBS[1][4]. The enzymes belong to the glycoside hydrolase family GH31 and are subject to drug and nutritional modulation. Potential safety concerns usually involve gastrointestinal side effects due to incomplete carbohydrate absorption[6].

Other names

Maltase-glucoamylase (MGAM)Sucrase-isomaltase (SI)α-glucosidaseAlpha-D-glucoside glucohydrolaseα-1,4-glucosidaseMaltase

Competitive inhibition of alpha-glucosidase activity, leading to reduced hydrolysis of dietary carbohydrates and delayed glucose absorption