Trehalose anabolism

Trehalose is a storage carbohydrate that can either be synthesized or obtained from the external environment. To be utilized as a carbon source, trehalase (EC:3.2.1.28) must convert trehalose and water into two molecules of glucose. S. cerevisiae has two trehalase enzymes, one is an acid trehalase encoded by ATH1 and the other is a neutral trehalase encoded by NTH1. The name "acid" or "neutral" are based on the optimal pH of each enzyme (pH 4.5-5.0 and pH 6.8-7.0, respectively).

海藻糖是一种储存碳水化合物，既能通过生物合成途径产生，亦能从外部环境中获取。作为碳源被利用时，需由麦芽糖酶（EC:3.2.1.28）将海藻糖与水分子转化成两分子葡萄糖。酿酒酵母（S. cerevisiae）中存在两种麦芽糖酶，其一由ATH1基因编码，为酸性麦芽糖酶；另一由NTH1基因编码，为中性麦芽糖酶。'酸性'与'中性'之称谓，乃依据各自酶的最适pH值而定，分别为pH 4.5-5.0和pH 6.8-7.0。