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Sucrase-isomaltase
Sucrase-isomaltase (, ''oligo-1,6-glucosidase'', ''limit dextrinase'', ''isomaltase'', ''exo-oligo-1,6-glucosidase'', ''dextrin 6alpha-glucanohydrolase'', ''alpha-limit dextrinase'', ''dextrin 6-glucanohydrolase'', ''oligosaccharide alpha-1,6-glucohydrolase'') is a glucosidase enzyme located in on the brush border of the small intestine with system name ''oligosaccharide 6-alpha-glucohydrolase''. Sucrase-isomaltase is a type II transmembrane glycoprotein located in the brush border of the small intestine. It has preferential expression in the apical membranes of enterocytes. The enzyme’s purpose is to digest dietary carbohydrates such as starch, glucose, and isomaltose. By further processing the broken-down products, energy in the form of ATP can be generated.〔Berg, J. M. et al. ''Biochemistry'', 7th Ed. W.H. Freeman and Company: New York, 2012.〕
==Enzyme Mechanism==
This enzyme catalyses the following chemical reaction
: Hydrolysis of (1->6)-alpha-D-glucosidic linkages in some oligosaccharides produced from starch and glycogen by enzyme EC 3.2.1.1.
Hydrolysis uses water to cleave chemical bonds. Sucrase-isomaltase’s mechanism results in a net retention of configuration at the anomeric center.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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