title: Unexpected nondenitrifier nitrous oxide reductase gene diversity and abundance in soils.
abstract: Agricultural and industrial practices more than doubled the intrinsic rate of terrestrial N fixation over the past century with drastic consequences, including increased atmospheric nitrous oxide (N(2)O) concentrations. N(2)O is a potent greenhouse gas and contributor to ozone layer destruction, and its release from fixed N is almost entirely controlled by microbial activities. Mitigation of N(2)O emissions to the atmosphere has been attributed exclusively to denitrifiers possessing NosZ, the enzyme system catalyzing N(2)O to N(2) reduction. We demonstrate that diverse microbial taxa possess divergent nos clusters with genes that are related yet evolutionarily distinct from the typical nos genes of denitirifers. nos clusters with atypical nosZ occur in Bacteria and Archaea that denitrify (44% of genomes), do not possess other denitrification genes (56%), or perform dissimilatory nitrate reduction to ammonium (DNRA; (31%). Experiments with the DNRA soil bacterium Anaeromyxobacter dehalogenans demonstrated that the atypical NosZ is an effective N(2)O reductase, and PCR-based surveys suggested that atypical nosZ are abundant in terrestrial environments. Bioinformatic analyses revealed that atypical nos clusters possess distinctive regulatory and functional components (e.g., Sec vs. Tat secretion pathway in typical nos), and that previous nosZ-targeted PCR primers do not capture the atypical nosZ diversity. Collectively, our results suggest that nondenitrifying populations with a broad range of metabolisms and habitats are potentially significant contributors to N(2)O consumption. Apparently, a large, previously unrecognized group of environmental nosZ has not been accounted for, and characterizing their contributions to N(2)O consumption will advance understanding of the ecological controls on N(2)O emissions and lead to refined greenhouse gas flux models.
authors.affiliation: Department of Geology, University of Illinois, Urbana, IL 61801, USA.
authors.forename: Robert A
authors.initials: RA
authors.lastname: Sanford
authors.forename: Darlene D
authors.initials: DD
authors.lastname: Wagner
authors.forename: Qingzhong
authors.initials: Q
authors.lastname: Wu
authors.forename: Joanne C
authors.initials: JC
authors.lastname: Chee-Sanford
authors.forename: Sara H
authors.initials: SH
authors.lastname: Thomas
authors.forename: Claribel
authors.initials: C
authors.lastname: Cruz-García
authors.forename: Gina
authors.initials: G
authors.lastname: Rodríguez
authors.forename: Arturo
authors.initials: A
authors.lastname: Massol-Deyá
authors.forename: Kishore K
authors.initials: KK
authors.lastname: Krishnani
authors.forename: Kirsti M
authors.initials: KM
authors.lastname: Ritalahti
authors.forename: Silke
authors.initials: S
authors.lastname: Nissen
authors.forename: Konstantinos T
authors.initials: KT
authors.lastname: Konstantinidis
authors.forename: Frank E
authors.initials: FE
authors.lastname: Löffler
mesh_terms: D001419:Bacteria / Q000145:classification* / Q000201:enzymology / Q000235:genetics; D001483:Base Sequence; D017931:DNA Primers; D014644:Genetic Variation; D008969:Molecular Sequence Data; D058465:Nitrification; D010088:Oxidoreductases / Q000235:genetics*; D010802:Phylogeny; D016133:Polymerase Chain Reaction; D012988:Soil Microbiology
chemical_list: D017931:DNA Primers; D010088:Oxidoreductases; C022763:nitrous oxide reductase