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Plant Physiology 67:467-469 (1981)
© 1981 American Society of Plant Biologists

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Articles

Role of Glutamate-oxaloacetate Transaminase and Malate Dehydrogenase in the Regeneration of NAD+ for Glycine Oxidation by Spinach leaf Mitochondria 1

Etienne-Pascal Journet, Michel Neuburger and Roland Douce

Physiologie Cellulaire Végétale, Département de Recherche Fondamentale/Biologie Végétale, Centre d'Etudes Nucléaires et Université Scientifique et Médicale de Grenoble, 85X 38041 Grenoble Cedex, France

During glycine oxidation by spinach leaf mitochondria, oxygen consumption showed a strong and transient inhibition upon addition of oxaloacetate or aspartate plus {alpha}-ketoglutarate. During the course of the inhibition, aspartate and {alpha}-ketoglutarate were stoichiometrically transformed into malate and glutamate.

It is concluded that oxaloacetate formed by transamination is reduced by the malate dehydrogenase, which allows the regeneration of NAD+ for glycine oxidation and, thus, by-passes the respiratory chain. Efficiency of a malate-glutamate/aspartate-{alpha}-ketoglutarate shuttle upon illumination and under in vivo conditions is discussed.

1 Supported in part by a research grant from the Centre National de la Recherche Scientifique (ERA 847: Interactions Plastes-Cytoplasme-Mitochondries).




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