Cited by 254Microbial Metabolic Engineering and BioproductionGene Regulatory Network AnalysisBioinformatics and Genomic Networks

A genome‐scale computational study of the interplay between transcriptional regulation and metabolism

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Shlomi, Tomer, Eisenberg, Yariv, Sharan, Roded, Ruppin, Eytan·2007·Molecular Systems Biology

Abstract

This paper presents a new method, steady-state regulatory flux balance analysis (SR-FBA), for predicting gene expression and metabolic fluxes in a large-scale integrated metabolic-regulatory model. Using SR-FBA to study the metabolism of Escherichia coli, we quantify the extent to which the different levels of metabolic and transcriptional regulatory constraints determine metabolic behavior: metabolic constraints determine the flux activity state of 45-51% of metabolic genes, depending on the growth media, whereas transcription regulation determines the flux activity state of 13-20% of the genes. A considerable number of 36 genes are redundantly expressed, that is, they are expressed even though the fluxes of their associated reactions are zero, indicating that they are not optimally tuned for cellular flux demands. The undetermined state of the remaining approximately 30% of the genes suggests that they may represent metabolic variability within a given growth medium. Overall, SR-FBA enables one to address a host of new questions concerning the interplay between regulation and metabolism.

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  • The dynamics of metabolite levels shaped by enzyme kinetics and enzymatic regulation can only be adequately captured by a kinetic model, because existing constraint-based models with Boolean regulatory architecture ignore enzymatic regulation.

    “These dynamics can only be adequately captured by a kinetic model, as, for example, existing constraint-based models with Boolean regulatory architecture such as developed and used by Covert et al (2004) and Shlomi et al (2007) ignore enzymatic regulation.”

    From Bacterial adaptation through distributed sensing of metabolic fluxes (2010) · cites this paper as Shlomi et al (2007)

  • The here proposed distributed sensing mechanism emerges from the system dynamics and could not have been deduced from a recently proposed constraint-based model integrating metabolic and transcriptional regulation.

    “The here proposed distributed sensing mechanism emerges from the system dynamics and could not have been deduced from a recently proposed constraint-based model integrating metabolic and transcriptional regulation (Covert et al, 2004; Shlomi et al, 2007).”

    From Bacterial adaptation through distributed sensing of metabolic fluxes (2010) · cites this paper as Shlomi et al, 2007

  • The extended constraint-based model replaces the unknown sensing mechanism through Boolean rules of the form 'If carbon source X is present, TF Y is active, otherwise not,' and is as such not suited to understand the detailed molecular processes leading to the activation of TF Y.

    “This model replaces the unknown sensing mechanism through Boolean rules of the form ‘If carbon source X is present, TF Y is active, otherwise not,’ and is as such not suited to understand the detailed molecular processes leading to the activation of TF Y.”

    From Bacterial adaptation through distributed sensing of metabolic fluxes (2010) · cites this paper as Shlomi et al, 2007

  • The underlying view of the extended constraint-based model is that top-level regulatory proteins recognize environmental conditions and adjust downstream metabolic operation.

    “The underlying view of the extended constraint-based model is that top-level regulatory proteins recognize environmental conditions and adjust downstream metabolic operation.”

    From Bacterial adaptation through distributed sensing of metabolic fluxes (2010) · cites this paper as Shlomi et al, 2007

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Authors
Shlomi, T., Eisenberg, Y., Sharan, R., & Ruppin, E.
Affiliations
Tel Aviv University (IL)
Corresponding author
  • Shlomi, Tomer
  • Ruppin, Eytan
Venue
Molecular Systems Biology
Published
2007-04-17
Volume
3
Issue
1
Pages
101-101
ISSN
1744-4292 (ISSN-L)
OpenAlex
W2112933558
Cited by
254
References
22
Citations by year
2026: 4 · 2025: 4 · 2024: 7 · 2023: 9 · 2022: 8 · 2021: 5 · 2020: 12 · 2019: 12 · 2018: 7 · 2017: 13 · 2016: 15 · 2015: 17 · 2014: 14 · 2013: 17 · 2012: 21
FWCI
8.34
Type
journal article
Language
en
Open access
Locations
  • Molecular Systems Biology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
Israel Science Foundation
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Microbial Metabolic Engineering and Bioproduction
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gene Regulatory Network Analysis
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bioinformatics and Genomic Networks
Keywords
transcriptional regulation, metabolic flux, gene expression prediction, Escherichia coli metabolism, metabolic constraints, metabolic variability
MeSH terms
Escherichia coli, Gene Expression Regulation, Transcription, Genetic, Genome, Bacterial

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