Plant Physiology 61:669-671 (1978)
© 1978 American Society of Plant Biologists
Articles
Activation of Chloroplast NADP-linked Glyceraldehyde-3-Phosphate Dehydrogenase by the Ferredoxin/Thioredoxin System 1
Ricardo A. Wolosiuk and
Bob B. Buchanan
Department of Cell Physiology, University of California, Berkeley, California 94720
NADP-glyceraldehyde-3-P dehydrogenase of spinach (Spinacia oleracea) chloroplasts was activated by thioredoxin that was reduced either photochemically with ferredoxin and ferredoxin-thioredoxin reductase or chemically with dithiothreitol. The activation process that was observed with the soluble protein fraction from chloroplasts and with the purified regulatory form of the enzyme was slow relative to the rate of catalysis. The NAD-linked glyceraldehyde-3-P dehydrogenase activity that is also present in chloroplasts and in the purified enzyme preparation was not affected by reduced thioredoxin.
When activated by dithiothreitol-reduced thioredoxin, the regulatory form of NADP-glyceraldehyde-3-P dehydrogenase was partly deactivated by oxidized glutathione. The enzyme activated by photochemically reduced thioredoxin was not appreciably affected by oxidized glutathione. The results suggest that although it resembles other regulatory enzymes in its requirements for light-dependent activation by the ferredoxin/thioredoxin system, NADP-glyceraldehyde-3-P dehydrogenase differs in its mode of deactivation and in its capacity for activation by enzyme effectors independently of thioredoxin.
1 This work was supported in part by National Science Foundation Grant PCM 76-82232 and National Institutes of Health Grant GM 20579.
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