Peroxiredoxins (Prx) are present in many organisms from bacteria to mammals and have function in oxidant defense and signal transduction. Among the ten peroxi-redoxins found in Arabidopsis, the 2-Cys Prx, which is attached at the stromal side of the thylakoid membrane, is the best studied and suggested to be involved in antioxidant defense and protection of photosynthesis (Pulido et al. 2010). The thylakoid lumen contains PrxQ, for which no clear role has been assigned, since the mutant lacking this protein displayed a normal photosynthetic performance (Petersson et al. 2006).

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