Superoxide dismutase.2C catalase.2C and peroxiredoxins Antioxidant

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decameric structure of ahpc, bacterial 2-cysteine peroxiredoxin salmonella typhimurium.


peroxiredoxins peroxidases catalyze reduction of hydrogen peroxide, organic hydroperoxides, peroxynitrite. divided 3 classes: typical 2-cysteine peroxiredoxins; atypical 2-cysteine peroxiredoxins; , 1-cysteine peroxiredoxins. these enzymes share same basic catalytic mechanism, in redox-active cysteine (the peroxidatic cysteine) in active site oxidized sulfenic acid peroxide substrate. over-oxidation of cysteine residue in peroxiredoxins inactivates these enzymes, can reversed action of sulfiredoxin. peroxiredoxins seem important in antioxidant metabolism, mice lacking peroxiredoxin 1 or 2 have shortened lifespan , suffer hemolytic anaemia, while plants use peroxiredoxins remove hydrogen peroxide generated in chloroplasts.








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