|
Author:
Date:
2015-11-05
[Abstract] Mannitol is a polyol that occurs in a wide range of living organisms, where it fulfills different physiological roles. Several pathways have been described for the metabolism of mannitol by bacteria, including the phosphoenolpyruvate-dependent phosphotransferase system (PST) and a M2DH-based catabolic pathway. The latter involves two enzymes, a mannitol-2-dehydrogenase (EC 1.1.1.67) and a fructokinase (EC 2.7.1.4), and has been identified in different bacteria, e.g., the marine Bacteroidetes Zobellia galactanivorans (Zg) which had recently gained interest to study the degradation of macroalgal polysaccharides. This protocol describes the biochemical characterization of a recombinant mannitol-2-dehydrogenase (M2DH) of Zobellia galactanivorans. The Zg ...
[摘要] 甘露醇是在多种活生物体中发生的多元醇，其中它实现不同的生理作用。已经描述了用于由细菌代谢甘露醇的几种途径，包括磷酸烯醇丙酮酸依赖性磷酸转移酶系统（PST）和基于M2DH的分解代谢途径。后者涉及两种酶，甘露醇-2-脱氢酶（EC 1.1.1.67）和果糖激酶（EC 2.7.1.4），并且已经在不同的细菌中鉴定，例如， 海洋拟杆菌（Zobellia galactanivorans）（ Zg ），最近对研究大分子多糖降解有兴趣。该方案描述了半乳聚糖微生物的重组甘露醇-2-脱氢酶（M2DH）的生物化学表征。使用NAD +辅助作为辅因子，M2DH酶催化甘露醇向果糖的可逆转化。 在两个方向上测定M2DH活性，即果糖还原和甘露醇氧化。
可逆反应：
D-甘露醇+ NAD + ↔D-果糖+ NADH + H +
|