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Deinococcus radiodurans  is an extremely radioresistant bacterium characterized by D 10  of 10 kGy, and able to grow luxuriantly under chronic ionizing radiation of 60 Gy/h. The aim of this article is to review the antioxidant system of  D. radiodurans  and its possible role in the unusual resistance of this bacterium to ionizing radiation. The unusual radiation resistance of  D. radiodurans  has apparently evolved as a side effect of the adaptation of this extremophile to other damaging environmental factors, especially desiccation. The antioxidant proteins and low-molecular antioxidants (especially low-molecular weight Mn 2+  complexes and carotenoids, in particular, deinoxanthin), as well as protein and non-protein regulators, are important for the antioxidant defense of this species. Antioxidant protection of proteins from radiation inactivation enables the repair of DNA damage caused by ionizing radiation.

Antioxidant defense of Deinococcus radiodurans : how does it contribute to extreme radiation resistance?