該基因編碼一種在腸道刷緣表達的蔗糖酶-異麥芽糖酶編碼蛋白被合成為前體蛋白，被胰腺蛋白酶切割成蔗糖酶和異麥芽糖酶兩個酶亞單位。這兩個亞基異源二聚形成蔗糖異麥芽糖酶復合物。這種復合物對于消化包括淀粉、蔗糖和異麥芽糖在內的膳食碳水化合物是必不可少的。該基因突變是先天性蔗糖酶-異麥芽糖酶缺乏癥的原因。
This gene encodes a sucrase-isomaltase enzyme that is expressed in the intestinal brush border. The encoded protein is synthesized as a precursor protein that is cleaved by pancreatic proteases into two enzymatic subunits sucrase and isomaltase. These two subunits heterodimerize to form the sucrose-isomaltase complex. This complex is essential for the digestion of dietary carbohydrates including starch, sucrose and isomaltose. Mutations in this gene are the cause of congenital sucrase-isomaltase deficiency.