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PMID: 19478804 Published · ppublish English Journal Article

(13)C-based metabolic flux analysis.

Nature protocols ·Vol. 4 ·No. 6 ·2009-00-00 ·Pages 878-92

Zamboni N, Fendt SM, Rühl M, Sauer U

Abstract

Stable isotope, and in particular (13)C-based flux analysis, is the exclusive approach to experimentally quantify the integrated responses of metabolic networks. Here we describe a protocol that is based on growing microbes on (13)C-labeled glucose and subsequent gas chromatography mass spectrometric detection of (13)C-patterns in protein-bound amino acids. Relying on publicly available software packages, we then describe two complementary mathematical approaches to estimate either local ratios of converging fluxes or absolute fluxes through different pathways. As amino acids in cell protein are abundant and stable, this protocol requires a minimum of equipment and analytical expertise. Most other flux methods are variants of the principles presented here. A true alternative is the analytically more demanding dynamic flux analysis that relies on (13)C-pattern in free intracellular metabolites. The presented protocols take 5-10 d, have been used extensively in the past decade and are exemplified here for the central metabolism of Escherichia coli.

MeSH Terms
Amino Acids/metabolism Carbon Isotopes Escherichia coli/metabolism Escherichia coli Proteins/metabolism Gas Chromatography-Mass Spectrometry Glucose/metabolism Metabolic Networks and Pathways Metabolomics/methods Models, Biological
Chemicals
Amino Acids Carbon Isotopes Escherichia coli Proteins Glucose
Authors & Affiliations
4 authors, click to expand affiliations / ORCID
Zamboni Nicola
Institute of Molecular Systems Biology, ETH Zurich, Zurich, Switzerland.
Fendt Sarah-Maria
Rühl Martin
Sauer Uwe
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Article Info
Journal
Nature protocols
Abbr.
Nat Protoc
ISSN
1750-2799
Published
2009-00-00
Epub
2009-00-21
Pages
878-92
Language
English
Region
England
NLM ID
101284307
Subset
IM
Analysis Services
Analysis Services

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