Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 85:124-130 (1987)
© 1987 American Society of Plant Biologists

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Metabolism and Enzymology

Light and Acetate Regulate a Mitochondrial Malate Dehydrogenase 1

Friedhelm Struck, Sabine Grölz-Krug, Bruce Boschek and Klaus Zetsche

Institut für Pflanzenphysiologie der Justus-Liebig-Universität Giebetaen, Heinrich-Buff-Ring 58, D-6300, Giebetaen, Federal Republic of Germany, Institut für Medizinische Virologie der Justus-Liebig-Universität Giebetaen, Frankfurter Strabetae 107, D-6300 Giebetaen, Federal Republic of Germany

A malate dehydrogenase was purified from the unicellular green alga Chlorogonium elongatum Dangeard. The enzyme was localized in the mitochondria by immunogold electron microscopy and was found to be present on the cristae. The concentration of the enzyme is regulated by acetate and light. In cells cultured heterotrophically with acetate as carbon source the activity and the concentration of the enzyme is 5- to 6-fold higher than in autotrophic cells. In mixotrophically cultured cells (light and acetate) the enzyme level attains only half of the value of that in heterotrophic cells. Acetate induces an increase of the enzyme concentration while light has an inhibitory effect on this process.

1 Supported by the Deutsche Forschungsgemeinschaft (Ze71/20-4 and SFB 47). This work is part of the Ph.D. thesis of F. Struck.






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