Small intestine brush border enzymes (BBE)

Small intestine brush border enzymes are a collection of hydrolases anchored to the microvilli of the intestinal epithelium, where they execute the final steps of nutrient digestion. This group includes essential disaccharidases such as sucrase-isomaltase, maltase-glucoamylase, and lactase, as well as various peptidases like aminopeptidase N and dipeptidyl peptidase-4 [1][5]. Their primary biological role is to catalyze the hydrolysis of oligosaccharides and peptides into simple monosaccharides and amino acids, facilitating their subsequent absorption into the systemic circulation [1][2]. In a pharmacological context, these enzymes—specifically the alpha-glucosidases—are the primary targets for drugs used to manage Type 2 Diabetes Mellitus [3][4]. By inhibiting these enzymes, drugs like acarbose delay the breakdown of complex carbohydrates, thereby smoothing out postprandial glucose spikes and improving overall glycemic control [3]. Deficiencies or dysfunction of these enzymes are associated with various malabsorption syndromes, such as lactose intolerance or congenital sucrase-isomaltase deficiency, which lead to gastrointestinal distress when specific substrates are ingested [2][5].

Other names

Intestinal brush border hydrolasesMicrovillar enzymesDisaccharidasesAlpha-glucosidasesIntestinal peptidases

Competitive inhibition of membrane-bound intestinal alpha-glucoside hydrolase enzymes, which results in delayed glucose absorption and lowering of postprandial hyperglycemia [3][4].