Antioxidative Enzymes of Sulfate-Reducing Bacterium Desulfovibrio desulfuricans: Superoxide Dismutase and Peroxidases

M. N. Davydova^* and R. Z. Sabirova

Kazan Institute of Biochemistry and Biophysics, Kazan Research Center, Russian Academy of Sciences, ul. Lobachevskogo 2/31, Kazan, 420111 Russia; fax: (8432) 38-7577; E-mail: davydova@mail.knc.ru

^* To whom correspondence should be addressed.

Received July 20, 2001; Revision received March 14, 2002

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Extracts of Desulfovibrio desulfuricans B-1388 cells grown under anaerobic conditions displayed superoxide dismutase activity. The maximal activity was found during the stationary growth phase. The enzyme was virtually completely located in the periplasm fraction. D. desulfuricans B-1388 lacked catalase activity but contained active NADH- and NADPH-peroxidases. The activity of NADH-peroxidase depended on the physiological state of the culture. On changing the growth conditions (the presence of 5% CO in the gaseous phase), the activity of superoxide dismutase decreased.

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KEY WORDS: Desulfovibrio desulfuricans, superoxide dismutase, NADH-peroxidase, NADPH-peroxidase, catalase

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