The invention provides a formate dehydrogenase having high specific activity, small Km values for formate and NAD, broad temperature and pH ranges of stability, broad temperature and pH ranges for action, and capable of regenerating a coenzyme with good efficiency in case of being present in an enzymatic reduction reaction system without inactivated.
The invention provides the enzyme mentioned above which has characteristics suited for industrial application by screening for soil formate dehydrogenase-producing microorganisms. The invention further provides a DNA containing the gene coding for the enzyme of the invention, a recombinant DNA constructed using a vector, and a transformant obtained by using this plasmid. The invention further provides a process for producing the formate dehydrogenase of the invention by using any microorganism of the genus Thiobacillus or a transformant constructed by using a formate dehydrogenase gene derived from above strain of microorganism, and a process for regenerating a coenzyme by using said enzyme in an enzymatic reduction system.
本发明提供了一种具有高比活性、对
甲酸和
NAD具有小Km值、广泛的温度和pH稳定性范围、广泛的温度和pH操作范围,并且在酶催化还原反应系统中存在时能够高效地再生辅酶的
甲酸脱氢酶。本发明通过筛选土壤
甲酸脱氢酶产生微
生物,提供了适用于工业应用的具有上述特征的酶。本发明还提供了含有编码该酶的
基因的DNA、使用载体构建的
重组DNA以及使用该质粒获得的转化体。本发明还提供了一种利用任何Thiobacillus属微
生物或利用源自上述微
生物菌株的
甲酸脱氢酶
基因构建的转化体制备本发明的
甲酸脱氢酶的方法,以及利用该酶在酶催化还原系统中再生辅酶的方法。