Rapid viability loss on exposure to air in a superoxide dismutase-deficient mutant of Porphyromonas gingivalis - PubMed (original) (raw)

Rapid viability loss on exposure to air in a superoxide dismutase-deficient mutant of Porphyromonas gingivalis

K Nakayama. J Bacteriol. 1994 Apr.

Abstract

Porphyromonas gingivalis, an obligate anaerobe, exhibits a relatively high degree of aerotolerance and possesses superoxide dismutase (SOD) which is induced by exposure to air. To clarify roles for SOD in this organism, the gene encoding SOD (sod) on the P. gingivalis chromosome was disrupted in a gene-directed way by use of a suicide plasmid containing a mutated sod. A sod mutant thus obtained showed no SOD activity in crude extracts and exhibited a rapid viability loss immediately after exposure to air, whereas the wild-type parent showed no decrease in viability for at least 5 h under aerobic conditions. These results clearly indicate that SOD is essential for aerotolerance in P. gingivalis.

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References

    1. J Biol Chem. 1969 Nov 25;244(22):6049-55 -PubMed
    1. Plasmid. 1992 May;27(3):246-50 -PubMed
    1. Infect Immun. 1977 Apr;16(1):20-5 -PubMed
    1. J Bacteriol. 1978 Jun;134(3):1141-56 -PubMed
    1. Annu Rev Pharmacol Toxicol. 1983;23:239-57 -PubMed

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