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Related Experiment Videos

Light and acetate regulate a mitochondrial malate dehydrogenase.

F Struck1, S Grölz-Krug, B Boschek

  • 1Institut für Pflanzenphysiologie der Justus-Liebig-Universität Giessen, Heinrich-Buff-Ring 58, D-6300, Giessen, Federal Republic of Germany.

Plant Physiology
|September 1, 1987
PubMed
Summary

Malate dehydrogenase concentration in Chlorogonium elongatum is regulated by acetate and light. Acetate increases enzyme levels, while light inhibits this increase, impacting cellular metabolism.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Algal Physiology

Background:

  • Malate dehydrogenase (MDH) is a key enzyme in cellular metabolism.
  • Understanding its regulation in algae is crucial for metabolic studies.

Purpose of the Study:

  • To purify and localize malate dehydrogenase in Chlorogonium elongatum.
  • To investigate the regulatory effects of acetate and light on MDH concentration.

Main Methods:

  • Enzyme purification techniques.
  • Immunogold electron microscopy for enzyme localization.
  • Culturing of algal cells under different conditions (autotrophic, heterotrophic, mixotrophic).

Main Results:

  • Malate dehydrogenase was purified and localized to the mitochondrial cristae.

Related Experiment Videos

  • Enzyme concentration was 5-6 fold higher in heterotrophic (acetate) vs. autotrophic conditions.
  • Mixotrophic conditions resulted in half the enzyme level of heterotrophic conditions.
  • Acetate induced increased MDH concentration, light inhibited it.

    • Conclusions:

    • MDH concentration in Chlorogonium elongatum is significantly influenced by nutrient availability and light.
    • Acetate acts as an inducer, while light has an inhibitory role in MDH regulation.