Role of Nitric Oxide in Hydroxylamine Oxidation by Ammonia-Oxidizing Bacteria
Eunkyung Choi, Sana Chaudhry, Willm Martens‐Habbena
Abstract
Ammonia oxidation by chemolithoautotrophic ammonia-oxidizing bacteria (AOB) is thought to contribute significantly to global nitrous oxide (N 2 O) emissions and leaching of oxidized nitrogen, particularly through their activity in nitrogen (N)-fertilized agricultural production systems. Although substantial efforts have been made to characterize the N metabolism in AOB, recent findings suggest that nitric oxide (NO) may play an important mechanistic role as a free intermediate of hydroxylamine oxidation in AOB, further implying that besides hydroxylamine dehydrogenase (HAO), additional enzymes may be required to complete the ammonia oxidation pathway.
Topics & Concepts
HydroxylamineAmmoniaOxidizing agentBacteriaChemistryNitric oxideNitrogenNitrificationInorganic chemistryNitrogen cycleNitrous oxideEnvironmental chemistryLeaching (pedology)Microbial metabolismBiochemistryOrganic chemistryBiologyEcologyGeneticsSoil waterWastewater Treatment and Nitrogen RemovalMicrobial Fuel Cells and BioremediationMicrobial Community Ecology and Physiology