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Light energy conservation processes in Halobacterium halobium cells.

R A Bogomolni

    Federation Proceedings
    |May 1, 1977
    PubMed
    Summary
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    Halobacterium halobium uses light or respiration to create an electrochemical gradient. This energy is transiently stored, with proton inflow coupled to ATP synthesis, supporting the chemiosmotic hypothesis.

    Area of Science:

    • Bioenergetics
    • Microbiology
    • Cellular Physiology

    Background:

    • Proton pumping by light or respiration generates a transient electrochemical potential in Halobacterium halobium.
    • Cellular energy transducers stabilize this energy, counteracting proton leaks.
    • This energy is stored as high-energy phosphate bonds and ion electrochemical potentials.

    Purpose of the Study:

    • To investigate the mechanisms of energy transduction and storage in Halobacterium halobium.
    • To resolve the kinetics of proton inflow coupled to ATP synthesis.
    • To elucidate the relationship between light-induced proton pumping, membrane potential, and pH changes.

    Main Methods:

    • Kinetic resolution of proton inflow coupled to ATP synthesis.
    • Simultaneous measurements of photophosphorylation and proton inflow.

    Related Experiment Videos

  • Analysis of light-induced changes in membrane potential and pH.

    • Main Results:

    • A proton-per-ATP ratio of approximately 3 was calculated, supporting the chemiosmotic coupling hypothesis.
    • Light-driven proton pumping increased the pre-existing membrane potential by only 20-30 mV.
    • Complex kinetic features of membrane potential changes suggest involvement of ions other than protons.

    Conclusions:

    • The findings are consistent with the chemiosmotic coupling hypothesis.
    • A model is proposed where protonmotive force relaxes via proton inflow through ATPase at a critical threshold.
    • The trigger for this relaxation may involve protonmotive force, pH gradient, or internal pH.