Open AccessHow radiation kills cells: Survival of Deinococcus radiodurans and Shewanella oneidensis under oxidative stress ⋆
Author(s) -
Ghosal Debabrota,
Omelchenko Marina V.,
Gaidamakova Elena K.,
Matrosova Vera Y.,
Vasilenko Alexander,
Venkateswaran Amudhan,
Zhai Min,
Kostandarithes Heather M.,
Brim Hassan,
Makarova Kira S.,
Wackett Lawrence P.,
Fredrickson James K.,
Daly Michael J.
Publication year - 2005
Publication title -
fems microbiology reviews
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.91
H-Index - 212
eISSN - 1574-6976
pISSN - 0168-6445
DOI - 10.1016/j.fmrre.2004.12.007
Subject(s) - deinococcus radiodurans , shewanella oneidensis , oxidative stress , shewanella , biology , bacteria , oxidative phosphorylation , deinococcus , dna damage , citric acid cycle , biophysics , dna repair , biochemistry , intracellular , microbiology and biotechnology , chemistry , dna , metabolism , genetics
We have recently shown that Deinococcus radiodurans and other radiation resistant bacteria accumulate exceptionally high intracellular manganese and low iron levels. In comparison, the dissimilatory metal‐reducing bacterium Shewanella oneidensis accumulates Fe but not Mn and is extremely sensitive to radiation. We have proposed that for Fe‐rich, Mn‐poor cells killed at radiation doses which cause very little DNA damage, cell death might be induced by the release of Fe(II) from proteins during irradiation, leading to additional cellular damage by Fe(II)‐dependent oxidative stress. In contrast, Mn(II) ions concentrated in D. radiodurans might serve as antioxidants that reinforce enzymic systems which defend against oxidative stress during recovery. We extend our hypothesis here to include consideration of respiration, tricarboxylic acid cycle activity, peptide transport and metal reduction, which together with Mn(II) transport represent potential new targets to control recovery from radiation injury.