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Relationship between Enzyme Activities Involved in Oxygen Metabolism and Oxygen Tolerance in Black-pigmented Bacteroides
A. Amano
Department of Preventive Dentistry, Osaka University Faculty of Dentistry, 1-8, Yamadaoka, Suita, Osaka 565, Japan
H. Tamagawa
Department of Preventive Dentistry, Osaka University Faculty of Dentistry, 1-8, Yamadaoka, Suita, Osaka 565, Japan
M. Takagaki
Department of Preventive Dentistry, Osaka University Faculty of Dentistry, 1-8, Yamadaoka, Suita, Osaka 565, Japan
Y. Murakami
Department of Preventive Dentistry, Osaka University Faculty of Dentistry, 1-8, Yamadaoka, Suita, Osaka 565, Japan
S. Shizukuishi
Department of Preventive Dentistry, Osaka University Faculty of Dentistry, 1-8, Yamadaoka, Suita, Osaka 565, Japan
A. Tsunemitsu
Department of Preventive Dentistry, Osaka University Faculty of Dentistry, 1-8, Yamadaoka, Suita, Osaka 565, Japan
In this study, the relationship between enzyme activities involved in oxygen metabolism and the degrees of oxygen tolerance in black-pigmented Bacteroides was investigated. All strains of Bacteroides tested possessed the activities of NADH oxidase and superoxide dismutase, whereas the activities of catalase and peroxidases were not detected in the cell-free extracts. There were relatively high correlations between ozygen tolerance and activity of either NADH oxidase or superoxide dismutase. The activity of superoxide dismutase showed a higher correlation with oxygen tolerance than with that of NADH oxidase. Among the species tested, Bacteroides gingivalis showed the highest activities of both the enzymes and was the most tolerant in the presence of oxygen. Furthermore, the activities of these two enzymes increased during aeration of the oxygen-tolerant strain Bacteroides gingivalis 381, but not in the oxygen-sensitive strain Bacteroides denticola ATCC 33185. These results suggest that superoxide dismutase and NADH oxidase might be important for protection of black-pigmented Bacteroides against the toxic effect of oxygen.
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Journal of Dental Research, Vol. 67, No. 9,
1196-1199 (1988)
DOI: 10.1177/00220345880670090901
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