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Isotopically nonstationary metabolic flux analysis (INST-MFA): putting theory into practice

Journal Article · · Current Opinion in Biotechnology
 [1];  [2]
  1. Vanderbilt Univ., Nashville, TN (United States); DOE/OSTI
  2. Vanderbilt Univ., Nashville, TN (United States)

Typically, 13C flux analysis relies on assumptions of both metabolic and isotopic steady state. If metabolism is steady but isotope labeling is not allowed to fully equilibrate, isotopically nonstationary metabolic flux analysis (INST-MFA) can be used to estimate fluxes. This requires solution of differential equations that describe the time-dependent labeling of network metabolites, while iteratively adjusting the flux and pool size parameters to match the transient labeling measurements. INST-MFA holds a number of unique advantages over approaches that rely solely upon steady-state isotope enrichments. First, INST-MFA can be applied to estimate fluxes in autotrophic systems, which consume only single-carbon substrates. Second, INST-MFA is ideally suited to systems that label slowly due to the presence of large intermediate pools or pathway bottlenecks. Finally, INST-MFA provides increased measurement sensitivity to estimate reversible exchange fluxes and metabolite pool sizes, which represents a potential framework for integrating metabolomic analysis with 13C flux analysis. This review highlights the unique capabilities of INST-MFA, describes newly available software tools that automate INST-MFA calculations, presents several practical examples of recent INST-MFA applications, and discusses the technical challenges that lie ahead.

Research Organization:
Vanderbilt Univ., Nashville, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0008118
OSTI ID:
1611014
Alternate ID(s):
OSTI ID: 1778466
Journal Information:
Current Opinion in Biotechnology, Journal Name: Current Opinion in Biotechnology Vol. 54; ISSN 0958-1669
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

The challenge and potential of photosynthesis: unique considerations for metabolic flux measurements in photosynthetic microorganisms journal November 2018
Metabolic flux analysis of secondary metabolism in plants journal June 2020
The Design of FluxML: A Universal Modeling Language for 13C Metabolic Flux Analysis text January 2019
Applications of stable isotope-based metabolomics and fluxomics toward synthetic biology of cyanobacteria journal December 2019
ScalaFlux: A scalable approach to quantify fluxes in metabolic subnetworks text January 2020

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