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题目:: Transcription profiling of E. coli arginine regulon using wild type and argR- strains grown on medium with and without arginine
ID:
状态:: 发布时间Oct. 24, 2007 , 更新时间 March 27, 2012 , 提交时间 April 26, 2006,
物种:: Escherichia coli
摘要:: Analysis of the response to arginine of the Escherichia coli K-12 transcriptome by microarray hybridization and real-time quantitative PCR provides a first coherent quantitative picture of the ArgR-mediated repression of arginine biosynthesis and uptake genes. Transcriptional repression was shown to be the major control mechanism of the biosynthetic genes, leaving only limited room for additional transcriptional or post-transcriptional regulations. The art genes coding for the specific arginine uptake system are subject to ArgR-mediated repression, ; with a strong repression of artJ, coding for the periplasmic binding protein of the system. The hisJQMP genes of the histidine transporter (part of the LAO uptake system) were discovered to be a part of the arginine regulon. Analysis of their control region with reporter gene fusions and electrophoretic mobility shift in the presence of pure ArgR repressor showed the involvement in repression of the ArgR protein and of an ARG box 120 bp upstream of hisJ. No repression of the genes of the AO uptake system was observed. Finally, comparing the time course of arginine repression of gene transcription with the evolution of the specific ; activities of the cognate enzymes showed that while full genetic repression was achieved two minutes after arginine addition, enzyme concentrations were diluted at the rate of cell ; division. This emphasizes the importance of the feedback-inhibition of the first enzymatic ; step of the pathway in controlling the metabolic flow through the biosynthesis in the period following the onset of repression. Experiment Overall Design: 3 groups of 3 replicate samples were analyzed: Experiment Overall Design: (1) Wild type on minimal medium (strain P4X, slides 1753, 1765, 1989), this created a reference condition Experiment Overall Design: (2) Wild type grown in the presence of arginine (strain P4X plus 100µg/ml of arginine, slides 1754, 1766, 1990), this gave a list of all the genes repressed by the system: ArgR+arginine Experiment Overall Design: (3) Mutant where no active repressor is present; grown in the presence of arginine (strain P4XB2 (argR-) plus 100µg/ml arginine, slides 1992, 1993, 1994). This condition told us which genes are indeed regulated by the system: ArgR+arginine. Those genes are in this case derepressed.
实验种类:: transcription profiling by array
样本量:: 9
实验设计:
: 无设计数据
数据号:: E-GEOD-4724, GDS2427, GSE4724
数据状态:: 无法自动分析，您可以尝试手动分析数据。

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