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. 1978 May;134(2):375–380. doi: 10.1128/jb.134.2.375-380.1978

Superoxide dismutase and catalase levels in halophilic vibrios.

O P Daily, R M Debell, S W Joseph
PMCID: PMC222262  PMID: 350820

Abstract

Superoxide dismutase (SOD) and catalase (CAT) levels were determined for several aerobically grown halophilic vibrios and compared with those found in aerobically grown Escherichia coli K-12. The SOD levels ranged from 25 to 103.6 U/mg of protein for the vibrios compared with 44.6 U/mg of protein for E. coli. The CAT levels ranged from 2.1 to 32.1 U/mg of protein. Electrophoretic analysis of cell extracts revealed that the halophilic vibrios tested possessed only one detectable SOD enzyme, except one strain which possessed two distinct enzymes, as compared with the three SOD enzymes in aerobically grown E. coli K-12. A comparison of anaerobically and aerobically grown vibrios revealed a three- to fourfold increase in SOD activity in the aerobic cells, suggesting that oxygen acts as an inducer for SOD in the vibrios as has been reported for E. coli. In one strain, Vibrio parahaemolyticus 27519, both SOD enzymes were observed in low levels in anaerobic and at higher levels in aerobically grown cells as compared with only one SOD enzyme in anaerobically grown E. coli. This suggests that differences in SOD regulation occur between the two genera. Our results indicate that halophilic vibrios possess SOD, which could enhance viruulence by allowing the organisms to survive in oxygenated environments.

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Selected References

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