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Nitrous Oxide Reduction Kinetics Distinguish Bacteria Harboring Clade I NosZ from Those Harboring Clade II NosZ

Journal Article · · Applied and Environmental Microbiology
DOI:https://doi.org/10.1128/AEM.00409-16· OSTI ID:1474731
 [1];  [2];  [3];  [4];  [5]
  1. Univ. of Tennessee, Knoxville, TN (United States). Center for Environmental Biotechnology. Dept. of Microbiology; Korea Advanced Inst. of Science and Technology (KAIST), Daejeon (Korea, Republic of). Dept. of Civil and Environmental Engineering
  2. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Microbiology; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). UT-ORNL Joint Inst. for Biological Sciences (JIBS). Biosciences Division
  3. Korea Advanced Inst. of Science and Technology (KAIST), Daejeon (Korea, Republic of). Dept. of Civil and Environmental Engineering
  4. Univ. of Illinois, Urbana, IL (United States). Dept. of Geology
  5. Univ. of Tennessee, Knoxville, TN (United States). Center for Environmental Biotechnology. Dept. of Microbiology. Dept. of Civil and Environmental Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). UT-ORNL Joint Inst. for Biological Sciences (JIBS). Biosciences Division
Bacteria capable of reduction of nitrous oxide (N2O) to N2 separate into clade I and clade II organisms on the basis of nos operon structures and nosZ sequence features. In this paper, to explore the possible ecological consequences of distinct nos clusters, the growth of bacterial isolates with either clade I (Pseudomonas stutzeri strain DCP-Ps1, Shewanella loihica strain PV-4) or clade II (Dechloromonas aromatica strain RCB, Anaeromyxobacter dehalogenans strain 2CP-C) nosZ with N2O was examined. Growth curves did not reveal trends distinguishing the clade I and clade II organisms tested; however, the growth yields of clade II organisms exceeded those of clade I organisms by 1.5- to 1.8-fold. Further, whole-cell half-saturation constants (Ks s) for N2O distinguished clade I from clade II organisms. The apparent Ks values of 0.324 ± 0.078 μM for D. aromatica and 1.34 ± 0.35 μM for A. dehalogenans were significantly lower than the values measured for P. stutzeri (35.5 ± 9.3 μM) and S. loihica (7.07 ± 1.13 μM). Genome sequencing demonstrated that Dechloromonas denitrificans possessed a clade II nosZ gene, and a measured Ks of 1.01 ± 0.18 μM for N2O was consistent with the values determined for the other clade II organisms tested. Finally, these observations provide a plausible mechanistic basis for why the relative activity of bacteria with clade I nos operons compared to that of bacteria with clade II nos operons may control N2O emissions and determine a soil's N2O sink capacity.
Research Organization:
Korea Advanced Inst. of Science and Technology (KAIST), Daejeon (Korea, Republic of); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Sponsoring Organization:
National Research Foundation of Korea (NRF); USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Grant/Contract Number:
AC05-00OR22725; SC0006662
OSTI ID:
1474731
Journal Information:
Applied and Environmental Microbiology, Journal Name: Applied and Environmental Microbiology Journal Issue: 13 Vol. 82; ISSN 0099-2240
Publisher:
American Society for MicrobiologyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (11)

O2 versus N2O respiration in a continuous microbial enrichment journal July 2018
Nitrous oxide emissions from biofilm processes for wastewater treatment journal September 2018
Life on N2O: deciphering the ecophysiology of N2O respiring bacterial communities in a continuous culture journal February 2018
Ecological and physiological implications of nitrogen oxide reduction pathways on greenhouse gas emissions in agroecosystems journal May 2019
Resolving N 2 O respiration pathways: a tale of two NosZ clades : Resolving N journal November 2017
Carbon-driven enrichment of the crucial nitrate-reducing bacteria in limed peat soil microcosms journal July 2017
Nitrous Oxide Reduction by an Obligate Aerobic Bacterium, Gemmatimonas aurantiaca Strain T-27 journal April 2017
Draft Genome Sequence of Azospira sp. Strain I13, a Nitrous Oxide-Reducing Bacterium Harboring Clade II Type nosZ journal May 2018
Predominance and high diversity of genes associated to denitrification in metagenomes of subantarctic coastal sediments exposed to urban pollution journal November 2018
Biokinetic Characterization and Activities of N2O-Reducing Bacteria in Response to Various Oxygen Levels journal April 2018
New Breeding Techniques for Greenhouse Gas (GHG) Mitigation: Plants May Express Nitrous Oxide Reductase journal September 2018

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