Brush border digestive enzymes

Brush border digestive enzymes are a specialized group of hydrolases anchored to the microvilli of the small intestinal mucosa, collectively forming the functional "brush border" (StatPearls, 2023). These enzymes, which include disaccharidases such as sucrase-isomaltase, maltase-glucoamylase, and lactase, as well as various peptidases, are responsible for the final step of nutrient digestion before absorption (UniProt, 2024). They catalyze the breakdown of oligosaccharides into monosaccharides and oligopeptides into amino acids (NIH, 2022). From a therapeutic perspective, these enzymes are primary targets for the management of type 2 diabetes; alpha-glucosidase inhibitors like acarbose competitively bind to these enzymes to delay carbohydrate absorption and reduce postprandial hyperglycemia (PubMed, 2021). Dysfunction or absence of these enzymes leads to various malabsorption syndromes, including lactose intolerance and congenital sucrase-isomaltase deficiency (Mayo Clinic, 2023). Additionally, the integrity of the brush border and its enzymatic activity are often compromised in inflammatory conditions like celiac disease (PubMed, 2020).

Other names

Intestinal brush border enzymesMicrovillar enzymesSmall intestinal disaccharidasesIntestinal hydrolasesAlpha-glucosidasesSucrase-isomaltase complexMaltase-glucoamylaseLactase-phlorizin hydrolase

Competitive inhibition of alpha-glucosidase enzymes (such as maltase, sucrase, and glucoamylase) located in the brush border of the small intestine, which delays the hydrolysis of complex carbohydrates and disaccharides into absorbable monosaccharides, thereby slowing glucose absorption and reducing postprandial blood glucose levels (StatPearls, 2023).