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首页> 外文期刊>Journal of bacteriology >Sequence analysis of the Escherichia coli dnaE gene.
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Sequence analysis of the Escherichia coli dnaE gene.

机译:大肠杆菌dnaE基因的序列分析。

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We have determined the sequence of a 4,350-nucleotide region of the Escherichia coli chromosome that contains dnaE, the structural gene for the alpha subunit of DNA polymerase III holoenzyme. The dnaE gene appeared to be part of an operon containing at least three other genes: 5'-lpxB-ORF23-dnaE-ORF37-3' (ORF, open reading frame). The lpxB gene encodes lipid A disaccharide synthase, an enzyme essential for cell growth and division (M. Nishijima, C.E. Bulawa, and C.R.H. Raetz, J. Bacteriol. 145:113-121, 1981). The termination codons of lpxB and ORF23 overlapped the initiation codons of ORF23 and dnaE, respectively, suggesting translational coupling. No rho-independent transcription termination sequences were observed. A potential internal transcriptional promoter was found preceding dnaE. Deletion of the -35 region of this promoter abolished dnaE expression in plasmids lacking additional upstream sequences. From the deduced amino acid sequence, alpha had a molecular weight of 129,920 and an isoelectric point of 4.93 for the denatured protein. ORF23 encoded a more basic protein (pI 7.11) with a molecular weight of 23,228. In the accompanying paper (D.N. Crowell, W.S. Reznikoff, and C.R.H. Raetz, J. Bacteriol. 169:5727-5734, 1987), the sequence of the upstream region that contains lpxA and lpxB is reported.
机译:我们已经确定了包含dnaE(DNA聚合酶III全酶的α亚基的结构基因)的大肠杆菌染色体的4,350个核苷酸区域的序列。 dnaE基因似乎是操纵子的一部分,该操纵子包含至少三个其他基因:5'-lpxB-ORF23-dnaE-ORF37-3'(ORF,开放阅读框)。 lpxB基因编码脂质A二糖合酶,其是细胞生长和分裂所必需的酶(M.Nishijima,C.E.Bulawa和C.R.H.Raetz,J.Bacteriol.145:113-121,1981)。 lpxB和ORF23的终止密码子分别与ORF23和dnaE的起始密码子重叠,表明翻译偶联。没有观察到不依赖rho的转录终止序列。在dnaE之前发现了潜在的内部转录启动子。该启动子的-35区的缺失消除了在缺乏额外上游序列的质粒中的dnaE表达。根据推导的氨基酸序列,α的分子量为129,920,变性蛋白质的等电点为4.93。 ORF23编码分子量为23,228的更碱性的蛋白质(pI 7.11)。在随附的论文(D.N. Crowell,W.S。Reznikoff,和C.R.H. Raetz,J.Bacteriol.169:5727-5734,1987)中,报道了包含lpxA和lpxB的上游区域的序列。

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