Isotopically nonstationary MFA (INST-MFA) of autotrophic metabolism.

Jazmin LJ, O'Grady JP, Ma F, Allen DK, Morgan JA, Young JD
Methods Mol Biol. 2014 1090: 181-210

PMID: 24222417 · DOI:10.1007/978-1-62703-688-7_12

Metabolic flux analysis (MFA) is a powerful approach for quantifying plant central carbon metabolism based upon a combination of extracellular flux measurements and intracellular isotope labeling measurements. In this chapter, we present the method of isotopically nonstationary (13)C MFA (INST-MFA), which is applicable to autotrophic systems that are at metabolic steady state but are sampled during the transient period prior to achieving isotopic steady state following the introduction of (13)CO2. We describe protocols for performing the necessary isotope labeling experiments, sample collection and quenching, nonaqueous fractionation and extraction of intracellular metabolites, and mass spectrometry (MS) analysis of metabolite labeling. We also outline the steps required to perform computational flux estimation using INST-MFA. By combining several recently developed experimental and computational techniques, INST-MFA provides an important new platform for mapping carbon fluxes that is especially applicable to autotrophic organisms, which are not amenable to steady-state (13)C MFA experiments.

MeSH Terms (16)

Carbon Dioxide Carbon Isotopes Enzyme Assays Isotope Labeling Kinetics Metabolic Flux Analysis Phosphoenolpyruvate Carboxylase Photosynthesis Plant Leaves Plant Proteins Plants Seeds Starch Sugar Phosphates Tandem Mass Spectrometry Transaminases

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