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Microbial metabolomics : Toward a platform with full metabolome coverage

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Author: Werf, M.J.v.d. · Overkamp, K.M. · Muilwijk, B. · Coulier, L. · Hankemeier, T.
Type:article
Date:2007
Publisher: Elsevier
Institution: TNO Kwaliteit van Leven
Source:Analytical Biochemistry, 1, 370, 17-25
Identifier: 240258
doi: doi:10.1016/j.ab.2007.07.022
Keywords: Biology · Biotechnology · Coverage · Metabolome analysis · Metabolomics · Microbial systems biology · glucose · mineral · analytic method · article · Bacillus subtilis · bacterial growth · bacterium culture · computer model · culture medium · Escherichia coli · gas chromatography · liquid chromatography · mass spectrometry · metabolite · metabolomics · microbial metabolism · nonhuman · physical chemistry · priority journal · Saccharomyces cerevisiae · standard · systems biology · Bacillus subtilis · Chromatography, Liquid · Databases, Factual · Escherichia coli · Gas Chromatography-Mass Spectrometry · Saccharomyces cerevisiae · Bacillus subtilis · Escherichia coli · Saccharomyces cerevisiae

Abstract

Achieving metabolome data with satisfactory coverage is a formidable challenge in metabolomics because metabolites are a chemically highly diverse group of compounds. Here we present a strategy for the development of an advanced analytical platform that allows the comprehensive analysis of microbial metabolomes. Our approach started with in silico metabolome information from three microorganisms-Escherichia coli, Bacillus subtilis, and Saccharomyces cerevisiae-and resulted in a list of 905 different metabolites. Subsequently, these metabolites were classified based on their physicochemical properties, followed by the development of complementary gas chromatography-mass spectrometry and liquid chromatography-mass spectrometry methods, each of which analyzes different metabolite classes. This metabolomics platform, consisting of six different analytical methods, was applied for the analysis of the metabolites for which commercial standards could be purchased (399 compounds). Of these 399 metabolites, 380 could be analyzed with the platform. To demonstrate the potential of this metabolomics platform, we report on its application to the analysis of the metabolome composition of mid-logarithmic E. coli cells grown on a mineral salts medium using glucose as the carbon source. Of the 431 peaks detected, 235 (=176 unique metabolites) could be identified. These include 61 metabolites that were not previously identified or annotated in existing E. coli databases. © 2007 Elsevier Inc. All rights reserved.