Gama F, Keech O, Eymery F, Finkemeier I, Gelhaye E, Gardeström P, Dietz KJ, Rey P, Jacquot J-P, Rouhier N
The mitochondrial type II peroxiredoxin from poplar
Physiologia Plantarum: 2007 129:196-206
Mitochondria are a major site of reactive oxygen species production and
controlling the peroxide levels in this compartment is essential.
Peroxiredoxins (Prx) are heme-free peroxidases, which use reactive
cysteines for their catalysis and reducing systems for their
regeneration. One of the two Prxs present in poplar mitochondria, Prx
IIF, expressed as a recombinant protein, was found to reduce a broad
range of peroxides with electrons provided preferentially by
glutaredoxin and to a lesser extent by glutathione, all the
thioredoxins tested being inefficient. This protein is constitutively
expressed because it is found in all tissues analyzed. Its expression
is modified during a biotic interaction between poplar and the rust
fungus Melampsora laricii populina. On the other hand, Prx IIF
expression does not substantially vary under abiotic stress conditions.
Nevertheless, water deficit or chilling and probably induced
senescence, but not photooxidative conditions or heavy metal treatment,
also led to a small increase in PrxIIF abundance in Arabidopsis thaliana plants.
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