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EPR spectroscopy has been successfully used to detect signals due to molybdenum (V) and ferric iron in intact cells of aerobically grown Paracoccus denitrificans. The signals are ascribed to the catalytic molybdenum centre and to the haem iron of the periplasmic nitrate reductase. These signals are absent from a mutant strain deficient in this enzyme. The Mo(V) signal is due to the High-g Split species which has been well characterized in the purified enzyme. This confirms that the High-g Split is the physiologically relevant signal of a number observed in the previous work on the purified enzyme.

Identification of periplasmic nitrate reductase Mo(V) EPR signals in intact cells of Paracoccus denitrificans