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Aerobic ammonia-oxidizing archaea (AOA) play a crucial role in the global nitrogen cycle by oxidizing ammonia to nitrite, and nitric oxide (NO) is a key intermediate in AOA for sustaining aerobic ammonia oxidation activity. We herein heterologously expressed the NO-forming, copper-containing, dissimilatory nitrite reductase (NirK) from Nitrososphaera viennensis and investigated its enzymatic properties. The recombinant protein catalyzed the reduction of 15 NO 2  - to 15 NO, the oxidation of hydroxylamine ( 15 NH 2 OH) to 15 NO, and the production of 14-15 N 2 O from 15 NH 2 OH and 14 NO 2  - . To the best of our knowledge, the present study is the first to document the enzymatic properties of AOA NirK.

microbes and environments

Nitric Oxide Production from Nitrite Reduction and Hydroxylamine Oxidation by Copper-containing Dissimilatory Nitrite Reductase (NirK) from the Aerobic Ammonia-oxidizing Archaeon, &lt;i&gt;Nitrososphaera viennensis&lt;/i&gt;