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Oscillations and efficiency in glycolysis.

P H Richter, J Ross

    Biophysical Chemistry
    |December 1, 1980
    PubMed
    Summary

    Temporal oscillations in biochemical reactions can boost energy conversion efficiency. Glycolysis oscillations may increase energy output by 5-10%, potentially aiding early cellular evolution.

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    Area of Science:

    • Biochemistry
    • Metabolic Engineering
    • Evolutionary Biology

    Background:

    • Biochemical reaction systems often involve intermediate concentrations that fluctuate over time.
    • The efficiency of free energy conversion in biological processes is crucial for cellular function.
    • Understanding the role of temporal dynamics in metabolic pathways can reveal mechanisms for enhanced efficiency.

    Purpose of the Study:

    • To investigate whether temporal oscillations in intermediate concentrations enhance free energy conversion efficiency in biochemical reactions.
    • To analyze the glycolysis pathway as a model system to understand the role of oscillations in energy conversion.
    • To estimate the potential increase in free energy conversion efficiency due to oscillations in glycolysis.

    Main Methods:

    • Experimental estimation of Gibbs free energy changes along the glycolysis mechanism.
    • Postulation of a conceptual model for the glycolysis 'machine' involving key enzymatic reactions (PFK, GAPDH, PK).
    • Analysis of a simplified reaction mechanism incorporating oscillatory properties to compare steady-state and oscillatory operation.

    Main Results:

    • Temporal oscillations in intermediate concentrations can reduce free energy dissipation, thereby enhancing conversion efficiency.
    • The glycolysis pathway, modeled with PFK as an oscillophor, GAPDH as a phase-shifter, and PK as an oscillator, demonstrates improved efficiency under oscillatory conditions.
    • Oscillations in glycolysis are estimated to increase the free energy conversion efficiency from glucose + ADP to products + ATP by 5-10%.

    Conclusions:

    • Oscillatory dynamics in biochemical systems, such as glycolysis, offer a mechanism for more efficient free energy conversion compared to steady-state operation.
    • The observed efficiency enhancement suggests that oscillations may have played a significant role in the evolutionary development of metabolic pathways, particularly in anaerobic environments.
    • The findings provide insights into the functional significance of metabolic oscillations and their contribution to cellular energy metabolism.

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