Induction of superoxide dismutase by molecular oxygen.

Journal of Bacteriology
E M Gregory, I Fridovich

Abstract

Oxygen induces superoxide dismutase in Streptococcus faecalis and in Escherichia coli B. S. faecalis grown under 20 atm of O(2) had 16 times more of this enzyme than did anaerobically grown cells. In the case of E. coli, changing the conditions of growth from anaerobic to 5 atm of O(2) caused a 25-fold increase in the level of superoxide dismutase. Induction of this enzyme was a response to O(2) rather than to pressure, since 20 atm of N(2) was without effect. Induction of superoxide dismutase was a rapid process, and half of the maximal level was reached within 90 min after N(2)-grown cells of S. faecalis were exposed to 20 atm of O(2) at 37 C. S. faecalis did not contain perceptible levels of catalase under any of the growth conditions investigated by Stanier, Doudoroff, and Adelberg (23), and the concentration of catalase in E. coli was not affected by the presence of O(2) during growth. S. faecalis, which had been grown under 100% O(2) and which therefore contained an elevated level of superoxide dismutase, was more resistant of 46 atm of O(2) than were cells which had been grown under N(2). E. coli grown under N(2) contained as much superoxide dismutase as did S. faecalis grown under 1 atm of O(2). The E. coli which had be...Continue Reading

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