NAD+激酶
克隆(编程)
生物化学
DNA
生物
分子克隆
DNA测序
酶
遗传学
基因
化学
分子生物学
肽序列
计算机科学
程序设计语言
作者
Shingo Kuroda,Katsuyuki Tanizawa,Yuta Sakamoto,Hidehiko Tanaka,Kenji Soda
出处
期刊:Biochemistry
[American Chemical Society]
日期:1990-01-30
卷期号:29 (4): 1009-1015
被引量:75
摘要
The gene encoding alanine dehydrogenase (EC 1.4.1.1) from a mesophile, Bacillus sphaericus, was cloned, and its complete DNA sequence was determined. In addition, the same gene from a moderate thermophile, B. stearothermophilus, was analyzed in a similar manner. Large parts of the two translated amino acid sequences were confirmed by automated Edman degradation of tryptic peptide fragments. Each alanine dehydrogenase gene consists of a 1116-bp open reading frame and encodes 372 amino acid residues corresponding to the subunit (Mr = 39,500-40,000) of the hexameric enzyme. The similarity of amino acid sequence between the two alanine dehydrogenases with distinct thermostabilities is very high (greater than 70%). The nonidentical residues are clustered in a few regions with relatively short length, which may correlate with the difference in thermal stability of the enzymes. Homology search of the primary structures of both alanine dehydrogenases with those of other pyridine nucleotide-dependent oxidoreductases revealed significant sequence similarity in the regions containing the coenzyme binding domain. Interestingly, several catalytically important residues in lactate and malate dehydrogenases are conserved in the primary structure of alanine dehydrogenases at matched positions with similar mutual distances.
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