Influence of the leuX-encoded tRNA5(Leu) on the regulation of gene expression in pathogenic Escherichia coli.

Influence of the leuX-encoded tRNA5(Leu) on the regulation of gene expression in pathogenic Escherichia coli.
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leuX 编码的 tRNA5(Leu) 对致病性大肠杆菌基因表达调控的影响。

DOI:
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发表时间:
2002
影响因子:
1.2
通讯作者:
J. Hacker
J. Hacker
中科院分区:
生物4区
文献类型:
--
作者:
U. Dobrindt;K. Piechaczek;A. Schierhorn;G. Fischer;M. Hecker;J. Hacker

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编码次要tRNA5(Leu)的leuX基因对于致病性大肠杆菌菌株的几种毒力因子的表达是重要的。细菌在转录后水平调控基因表达的一种普遍机制是利用次要密码子的差异性使用来控制特定基因的表达。次要密码子使用理论的基础是细菌基因的密码子使用有偏性和tRNA受体的选择性。本研究旨在进一步探讨tRNA5(Leu)对致病性大肠杆菌基因表达的调控作用。杆菌为此,我们对致病性大肠杆菌不同毒力相关基因的tRNA5(Leu)依赖性调控的分子机制进行了研究。大肠杆菌中leuX的表达以及leuX在不同生长条件下的转录调控进行了详细研究。leuX编码的tRNA的存在或缺失对尿路致病性大肠杆菌基因表达的总体影响。对大肠杆菌536菌株进行了蛋白质组学研究。这些结果表明,tRNA5(Leu)在大肠杆菌基因表达中具有普遍的重要性。大肠杆菌和这种tRNA在全球调控网络的参与。
The leuX gene encoding the minor tRNA5(Leu) is important for the expression of several virulence factors of pathogenic Escherichia coli strains. The differential usage of minor codons to control the expression of specialized genes has been proposed to be a general mechanism of bacteria to regulate gene expression at the posttranscriptional level. The minor codon usage theory foots on the biased codon usage of bacterial genes and the selective availability of tRNA isoacceptors. We aimed at the further investigation of the regulatory role of the tRNA5(Leu) for gene expression in pathogenic E. coli. For this purpose, the molecular mechanism underlying the tRNA5(Leu)-dependent regulation of different virulence-associated genes of pathogenic E. coli as well as the regulation of leuX transcription under various growth conditions were investigated in detail. The global impact of the presence or absence of the leuX-encoded tRNA on gene expression of the uropathogenic E. coli strain 536 was studied by proteome analysis. The obtained results argue for a general importance of the tRNA5(Leu) for gene expression of E. coli and the involvement of this tRNA in global regulatory networks.
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