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Related Experiment Videos

Proton-coupled bioenergetic processes in extremely alkaliphilic bacteria.

T A Krulwich1, A A Guffanti

  • 1Department of Biochemistry, Mount Sinai School of Medicine, City University of New York, New York 10029.

Journal of Bioenergetics and Biomembranes
|December 1, 1992
PubMed
Summary

Extremely alkaliphilic bacteria use unique bioenergetic processes for survival. Novel features in their proton-coupled ATP synthase and sodium-hydrogen exchange systems enable pH homeostasis and energy coupling in harsh alkaline environments.

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The Na(+)-dependence of alkaliphily in Bacillus.

Biochimica et biophysica acta·2001

Area of Science:

  • Microbiology
  • Biochemistry
  • Bioenergetics

Background:

  • Extremely alkaliphilic bacteria thrive at pH 10.5+, requiring specialized bioenergetic mechanisms.
  • Key processes include proton-coupled ATP synthesis and Na+/H+ antiport for pH homeostasis.
  • Maintaining cellular pH and energy production in high external pH presents significant challenges.

Purpose of the Study:

  • To investigate the bioenergetic strategies of extremely alkaliphilic bacteria.
  • To understand the mechanisms of energy coupling to oxidative phosphorylation under extreme alkaline conditions.
  • To explore the role of novel features in ATP synthase and Na+ cycles for pH homeostasis.

Main Methods:

  • Analysis of oxidative phosphorylation and ATP synthase function.

Related Experiment Videos

  • Investigation of sodium-hydrogen (Na+/H+) antiport mechanisms.
  • Comparative studies of bulk proton gradients versus artificially imposed gradients.
  • Examination of specific respiratory chain complexes.

    • Main Results:

    • A discrepancy exists between the chemiosmotic driving force and phosphorylation potential in these bacteria.
    • Respiration-dependent proton gradients differ from artificial ones in energizing ATP synthesis.
    • Specific respiratory complexes appear crucial beyond bulk gradient generation.
    • Novel features in the Na+ cycle are vital for extreme pH homeostasis.

    Conclusions:

    • The bioenergetics of extremely alkaliphilic bacteria deviate from standard chemiosmotic models.
    • Specialized features of ATP synthase and Na+ cycles are essential for survival at high pH.
    • These adaptations allow for efficient energy coupling and pH homeostasis in extreme environments.