Suggested role of NosZ in preventing N 2 O inhibition of dissimilatory nitrite reduction to ammonium

Dissimilatory nitrate/nitrite reduction to ammonium (DNRA) is a microbial energy-conserving process that reduces NO and/or NO to NH . Interestingly, DNRA-catalyzing microorganisms possessing genes are occasionally found harboring genes encoding nitrous oxide reductases, i.e., the only group of enzym...

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Published in:mBio 2023-10, Vol.14 (5), p.e0154023
Main Authors: Yoon, Sojung, Heo, Hokwan, Han, Heejoo, Song, Dong-Uk, Bakken, Lars R, Frostegård, Åsa, Yoon, Sukhwan
Format: Article
Language:English
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Summary:Dissimilatory nitrate/nitrite reduction to ammonium (DNRA) is a microbial energy-conserving process that reduces NO and/or NO to NH . Interestingly, DNRA-catalyzing microorganisms possessing genes are occasionally found harboring genes encoding nitrous oxide reductases, i.e., the only group of enzymes capable of removing the potent greenhouse gas N O. Here, through a series of physiological experiments examining DNRA metabolism in one of such microorganisms, sp. DNRA2, we have discovered that N O may delay the transition to DNRA upon an oxic-to-anoxic transition, unless timely removed by the nitrous oxide reductases. These observations suggest a novel explanation as to why some -possessing microorganisms have retained genes: to remove N O that may otherwise interfere with the transition from O respiration to DNRA.
ISSN:2150-7511
2150-7511
DOI:10.1128/mbio.01540-23