Disaccharidase

Disaccharidases are a group of essential hydrolase enzymes located on the brush border membrane of the small intestinal enterocytes [UniProt, https://www.uniprot.org/uniprotkb/P14410/entry]. They catalyze the final step of carbohydrate digestion by breaking down disaccharides, such as sucrose, maltose, and lactose, into monosaccharides like glucose and fructose for systemic absorption [NIH, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4945292/]. Key enzymes in this class include sucrase-isomaltase, maltase-glucoamylase, and lactase. In therapeutic contexts, these enzymes are the primary targets for alpha-glucosidase inhibitors like acarbose and miglitol, which are used to manage postprandial hyperglycemia in type 2 diabetes mellitus [StatPearls, https://www.ncbi.nlm.nih.gov/books/NBK557848/]. By inhibiting these enzymes, the rate of glucose entry into the bloodstream is reduced, helping to stabilize blood sugar levels. Conversely, deficiencies in these enzymes lead to clinical malabsorption syndromes characterized by osmotic diarrhea and bloating due to the fermentation of undigested sugars by colonic bacteria [PubChem, https://pubchem.ncbi.nlm.nih.gov/compound/Acarbose].

Other names

Intestinal disaccharidasesBrush border enzymesAlpha-glucosidasesGlycoside hydrolases

Competitive inhibition of intestinal alpha-glucosidases and disaccharidases, which delays the hydrolysis of dietary oligosaccharides and disaccharides into monosaccharides, thereby slowing glucose absorption.