Plant Physiol. Drug Metab Dispos
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Plant Physiology 70:113-116 (1982)
© 1982 American Society of Plant Biologists

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A Thioredoxin-Mediated Activation of Glutamine Synthetase and Glutamate Synthase in Synchronous Chlorella sorokiniana1

Rudolf Tischner and Ahlert Schmidt

Pflanzenphysiogisches Institut, University of Göttingen, Göttingen, Federal Republic of Germany, Botanisches Institut, University of Munich, Munich, Federal Republic of Germany

The effects of thioredoxin, dithioerythrol, and mixtures of both on enzymes involved in N metabolism of Chlorella sorokiniana have been studied. Glutamine synthetase, inactivated in vivo, was activated 8-fold by thioredoxin and dithioerythrol. By the same treatment, the activity of glutamate synthase was stimulated nearly 4-fold. Thus, two key enzymes of N metabolism were shown to be regulated via thioredoxin. The enzymes of the nitrate reducing system, i.e. nitrate reductase and nitrite reductase, were not affected by thiols. From these results, a model of NO3– metabolism is put forward which considers the regulating effect of light.

1 Supported by a grant from Deutsche Forschungsgemeinschaft to R. T. and A. S.




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Copyright © 1982 by the American Society of Plant Biologists