一株高产α -淀粉酶枯草芽孢杆菌的α -淀粉酶基因(amyR2和amyE+):分子克隆和核苷酸序列。
文章的细节
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引用
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山崎H,大村K,中山A,武一Y,大宰K,山崎M,田村G,山根K
一株高产α -淀粉酶枯草芽孢杆菌的α -淀粉酶基因(amyR2和amyE+):分子克隆和核苷酸序列。
细菌学杂志,1983 10月;156(1):327-37。
- PubMed ID
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6413492 (PubMed视图]
- 摘要
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从一株α -淀粉酶高生产菌株枯草芽孢杆菌NA64中克隆了amyR2、amyE+和ari +等位基因,并将amyR2和amyE+基因重新克隆到质粒pUB110中,命名为pTUB4。在噬菌体基因组携带amyR2和amyE+的DNA片段中发现的限制性内切位点clay - ecori - psti - salii - smai顺序也在pTUB4的2.3千碱基插入位点中发现。pTUB4中amyR2和amyE+基因区DNA核苷酸序列的大约2600个碱基对被确定。从一个ATG启动子密码子开始,一个开放的阅读框由1,776个碱基对(592个氨基酸)组成。在1776个碱基对中,克隆的DNA片段中发现了1674个碱基对(558个氨基酸),在载体pUB110 DNA中发现了102个碱基对(34个氨基酸)。pTUB4 α -淀粉酶的COOH末端编码在pUB110中。α -淀粉酶在7.5%聚丙烯酰胺凝胶中的电泳迁移率略高于亲本α -淀粉酶。基因的NH2终止部分编码了一个41个氨基酸长的信号序列(Ohmura等人,生物化学。Biophys。1983年第112:687-683号决议)。 The DNA sequence of the mature extracellular alpha-amylase, a potential RNA polymerase recognition site and Pribnow box (TTGATAGAGTGATTGTGATAATTTAAAAT), and an AT-rich inverted repeat structure which has free energy of -8.2 kcal/mol (-34.3 kJ/mol) were identified. The AT-rich inverted repeat structure seemed to correspond to the hyperproducing character. The nucleotide sequence around the region was quite different from the promoter region of the B. subtilis 168 alpha-amylase gene which was cloned in the Escherichia coli vector systems.