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. 1978 Apr;61(4):669–671. doi: 10.1104/pp.61.4.669

Activation of Chloroplast NADP-linked Glyceraldehyde-3-Phosphate Dehydrogenase by the Ferredoxin/Thioredoxin System 1

Ricardo A Wolosiuk 1, Bob B Buchanan 1
PMCID: PMC1091941  PMID: 16660360

Abstract

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.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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