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A brush border (striated border or brush border membrane) is the microvillus-covered surface of simple cuboidal and simple columnar epithelium found in different parts of the body. Microvilli are approximately 100 nanometers in diameter and their length varies from approximately 100 to 2,000 nanometers.
Disaccharidases are glycoside hydrolases, enzymes that break down certain types of sugars called disaccharides into simpler sugars called monosaccharides.In the human body, disaccharidases are made mostly in an area of the small intestine's wall called the brush border, making them members of the group of "brush border enzymes".
Most of the trehalase enzymes isolated from bacteria have as optimum pH of 6.5–7.5. The trehalase enzyme of Mycobacterium smegmatis is a membrane bound protein. Periplasmic trehalase of Escherichia coli K12 is induced by growth at high osmolarity .
Enteropeptidase is a type II transmembrane serine protease (TTSP) localized to the brush border of the duodenal and jejunal mucosa and synthesized as a zymogen, proenteropeptidase, which requires activation by duodenase or trypsin. [9] TTSPs are synthesized as single chain zymogens with N-terminal propeptide sequences of different lengths.
Sucrase-isomaltase is a bifunctional glucosidase (sugar-digesting enzyme) located on the brush border of the small intestine, encoded by the human gene SI.It is a dual-function enzyme with two GH31 domains, one serving as the isomaltase, the other as a sucrose alpha-glucosidase.
Human genes that produce enzymes with activities specified by this EC number include: [8] MGAM is the "maltase-glucoamylase", found on the intestine brush border. GAA is the "acid alpha-glucosidase", found in the lysosome. GANC, "neutral alpha-glucosidase C".
One form, sucrase-isomaltase, is secreted in the small intestine on the brush border. [1] The enzyme invertase , which occurs more commonly in plants, fungi and bacteria, also hydrolyzes sucrose (and other fructosides) but by a different mechanism: it is a fructosidase, whereas sucrase is a glucosidase.
For instance, Aminopeptidase N (AP-N) is particularly abundant in the brush border membranes of the kidney, the small intestine, and the placenta, and is also found in the liver. [4] AP-N is involved in the final digestion of peptides generated from the hydrolysis (cleaving) of proteins by gastric and pancreatic proteases. [5]