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FEBS Lett. 1990 Jun 4;265(1-2):85-7.

Periplasmic and membrane-bound respiratory nitrate reductases in Thiosphaera pantotropha. The periplasmic enzyme catalyzes the first step in aerobic denitrification.

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Department of Biochemistry, University of Oxford, UK.


The unusual ability of Thiosphaera pantotropha to catalyze respiratory nitrate reduction under aerobic conditions is shown to correlate with the activity of a periplasmic nitrate reductase that is expressed under both aerobic and anaerobic growth conditions. The organism also synthesizes, but only under anaerobic conditions, a membrane-bound nitrate reductase which resembles the corresponding enzyme in Paracoccus denitrificans in respect of both catalytic properties and inhibition of activity in intact cells in the presence of oxygen.

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