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The Arabidopsis genome contains nine open reading frames with homology to members of the peroxi- redoxin (prx) family: one 1-Cys-prx, two 2-Cys-prx, five type II-prx, and one peroxiredoxin Q. The function of the peroxiredoxins in plant metabolism is only slowly emerging. They are assumed to reduce toxic peroxides to their corresponding alcohols with a rather broad substrate specificity. The 2-Cys peroxi- redoxins (2-CP) were recently identified as members of the antioxidant defence system of chloroplasts. Knock-out mutants of Synechocystis and antisense mutants of Arabidopsis have provided insight into the function of 2-CPs in the photosynthetic antioxidant network. This review summarizes present knowledge on the enzymatic mechanism, the physiological con- text and the genetic regulation of the 2-CPs in plants and cyanobacteria. In addition, an extrapolation on the metabolic role of the chloroplast 2-CP is attemp- ted based on the molecular features of 2-CPs from other organisms.

The function of the chloroplast 2-cysteine peroxiredoxin in peroxide detoxification and its regulation