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J. Bacteriol., 06 1995, 3344-3346, Vol 177, No. 11
Copyright © 1995, American Society for Microbiology

Superoxide dismutase protects against aerobic heat shock in Escherichia coli

L Benov and I Fridovich
Department of Biochemistry, Duke University Medical Center, Durham, North Carolina 27710, USA.

Exposure of a superoxide dismutase-null (sodA sodB) strain of Escherichia coli to aerobic heat stress (45 to 48 degrees C) caused a profound loss of viability, whereas the same heat stress applied anaerobically had a negligible effect. A superoxide dismutase-competent parental strain was resistant to the lethal effect of the aerobic heating. It follows that aerobic heating imposes an oxidative burden of which O2- must be a major component. This effect is not seen at 53 degrees C, presumably because, at this higher temperature, direct thermolability of vital cell components overrides the effect of superoxide radicals.


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