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Related Experiment Videos

Chemiosmotic energy from malolactic fermentation.

D J Cox1, T Henick-Kling

  • 1Department of Food Science and Technology, New York State Agricultural Experiment Station, Cornell University, Geneva 14456.

Journal of Bacteriology
|October 1, 1989
PubMed
Summary
This summary is machine-generated.

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Malolactic fermentation in Leuconostoc oenos generates cellular energy (ATP). This process requires intact cells and is sensitive to specific inhibitors, suggesting a unique energy-yielding pathway.

Area of Science:

  • Microbiology
  • Biochemistry
  • Cellular Metabolism

Background:

  • Malolactic fermentation (MLF) is a key process in winemaking, traditionally viewed primarily for its sensory impact.
  • The bioenergetics of MLF, specifically its capacity to generate adenosine triphosphate (ATP), remain incompletely understood.

Purpose of the Study:

  • To investigate whether malolactic fermentation in Leuconostoc oenos produces ATP.
  • To elucidate the cellular requirements and potential mechanisms of ATP generation during MLF.

Main Methods:

  • Utilized the luciferase-luciferin adenosine triphosphate (ATP) assay.
  • Employed whole cells of the lactic acid bacterium Leuconostoc oenos.
  • Tested the effects of dicyclohexylcarbodiimide (DCC) and the ionophore monensin on ATP production.

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Main Results:

  • Demonstrated that malolactic fermentation in whole Leuconostoc oenos cells yields ATP.
  • Observed that ATP production did not occur in cell extracts, indicating a requirement for cellular integrity.
  • Found that ATP generation was inhibited by dicyclohexylcarbodiimide and monensin.

Conclusions:

  • Malolactic fermentation is an energy-yielding process in Leuconostoc oenos, producing ATP.
  • The ATP generation mechanism is dependent on intact cellular structures and functions.
  • A lactate:proton efflux mechanism is proposed as the pathway for this energy transduction during MLF.