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Issue 2, 2008
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Depiction of metabolome changes in histidine-starved Escherichia coli by CE-TOFMS

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Abstract

Metabolic changes in response to histidine starvation were observed in histidine-auxotrophic Escherichia coli using a capillary electrophoresis time-of-flight mass spectrometry (CE-TOFMS)-based metabolomics technique. Prior to the analysis, we prepared an E. coli metabolome list of 727 metabolites reported in the literature. An improved method for metabolite extraction was developed, which resulted in higher extraction efficiency in phosphate-rich metabolites, e.g., ATP and GTP. Based on the results, 375 charged, hydrophilic intermediates in primary metabolisms were analysed simultaneously, providing quantitative data of 198 metabolites. We confirmed that the intracellular levels of intermediates in histidine biosynthesis are rapidly accumulated in response to a drop in histidine level under histidine-starved conditions. Simultaneously, disciplined responses were observed in the glycolysis, tricarboxylic acid cycle, and amino acid and nucleotide biosynthesis pathways as regulated by amino acid starvation.

Graphical abstract: Depiction of metabolome changes in histidine-starved Escherichia coli by CE-TOFMS

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Publication details

The article was received on 13 Sep 2007, accepted on 25 Oct 2007 and first published on 15 Nov 2007


Article type: Paper
DOI: 10.1039/B714176A
Citation: Mol. BioSyst., 2008,4, 135-147
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    Depiction of metabolome changes in histidine-starved Escherichia coli by CE-TOFMS

    Y. Ohashi, A. Hirayama, T. Ishikawa, S. Nakamura, K. Shimizu, Y. Ueno, M. Tomita and T. Soga, Mol. BioSyst., 2008, 4, 135
    DOI: 10.1039/B714176A

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