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Title: Near-equilibrium glycolysis supports metabolic homeostasis and energy yield

Journal Article · · Nature Chemical Biology

Glycolysis plays a central role in producing ATP and biomass. Its control principles, however, remain incompletely understood. In this work, we create a method that combines 2H and 13C tracers to determine glycolytic thermodynamics. With this method, we show that, in conditions and organisms with relatively slow fluxes, multiple steps in glycolysis are near to equilibrium, reflecting spare enzyme capacity. In Escherichia coli, nitrogen or phosphorus upshift rapidly increases the thermodynamic driving force, deploying the spare enzyme capacity to increase flux. Similarly, respiration inhibition in mammalian cells rapidly increases both glycolytic flux and the thermodynamic driving force. The thermodynamic shift allows flux to increase with only small metabolite concentration changes. Finally, we find that the cellulose-degrading anaerobe Clostridium cellulolyticum exhibits slow, near-equilibrium glycolysis due to the use of pyrophosphate rather than ATP for fructose-bisphosphate production, resulting in enhanced per-glucose ATP yield. Thus, near-equilibrium steps of glycolysis promote both rapid flux adaptation and energy efficiency.

Research Organization:
Univ. of Illinois, Champaign, IL (United States); Princeton Univ., NJ (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Grant/Contract Number:
SC0018420; SC0012461; AC05-00OR22725
OSTI ID:
1570470
Journal Information:
Nature Chemical Biology, Journal Name: Nature Chemical Biology Journal Issue: 10 Vol. 15; ISSN 1552-4450
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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