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A review on metabolic pathway analysis with emphasis on isotope labeling approach

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Abstract

The recent progress on metabolic systems engineering was reviewed based on our recent research results in terms of (1) metabolic signal flow diagram approach, (2) metabolic flux analysis (MFA) in particular with intracellular isotopomer distribution using NMR and/or GC-MS, (3) synthesis and optimization of metabolic flux distribution (MFD), (4) modification of MFD by gene manipulation and by controlling culture environment, (5) metabolic control analysis (MCA), (6) design of metabolic regulation structure, and (7) identification of unknown pathways with isotope tracing by NMR. The main characteristics of metabolic engineering is to treat metabolism as a network or entirety instead of individual reactions. The applications were made for poly-3-hydroxybutyrate (PHB) production usingRalstonia eutropha and recombinantEscherichia coli, lactate production by recombinantSaccharomyces cerevisiae, pyruvate production by vitamin auxotrophic yeastToluropsis glabrata, lysine production usingCorynebacterium glutamicum, and energetic analysis of photosynthesic microorganisms such as Cyanobateria. The characteristics of each approach were reviewed with their applications. The approach based on isotope labeling experiments gives reliable and quantitative results for metabolic flux analysis. It should be recognized that the next stage should be toward the investigation of metabolic flux analysis with gene and protein expressions to uncover the metabolic regulation in relation to genetic modification and/or the change in the culture condition.

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  1. Department of Biochemical Engineering & Science, Kyushu Institute of Technology, 820-8502, Iizuka, Fukuoka, Japan

    Azuyuki Shimizu

  2. Institute of Advanced Biosciences, Keio University, 997-0017, Tsuruoka, Yamagata, Japan

    Azuyuki Shimizu

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Shimizu, A. A review on metabolic pathway analysis with emphasis on isotope labeling approach. Biotechnol. Bioprocess Eng. 7, 237–251 (2002). https://doi.org/10.1007/BF02932832

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