Redox-Modification of Chloroplast Enzymes in Galdieria Sulphuraria: Trial-and-Error in Evolution or Perfect Adaptation to Extreme Conditions?
Regulation of enzyme activities is required for metabolism, in particular for assimilatory pathways in plastids of all photosynthetic eukaryotic organisms as well as in prokaryotes performing oxygenic photosynthesis. In order to be able to adjust the metabolic fluxes to the actual energy input and the demand, various enzymes have developed structures that are suitable for post-translational regulation by covalent redox-modification (Dietz et al., 2002). Reversible reduction/oxidation of cysteine residues is extremely suited for this purpose. It is mediated by thioredoxins that are present in all organisms (for review see: Buchanan, 1980)
KeywordsOxygenic Photosynthesis RubisCO Activase CP12 Protein Chloroplast Enzyme Regulatory Cysteine
The authors wish to thank Heike Schwiderski for the preparation of the manuscript. Some of the work described in this paper has been financially supported by the Deutsche Forschungsgemeinschaft.
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