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Inhibition of nitrous oxide reduction in forest soil microcosms by different forms of methanobactin

Journal Article · · Environmental Microbiology
 [1];  [2];  [3];  [3];  [4];  [2]
  1. University of Michigan, Ann Arbor, MI (United States); The University of Michigan
  2. University of Michigan, Ann Arbor, MI (United States)
  3. University of the Punjab, Lahore (Pakistan)
  4. Iowa State University, Ames, IA (United States)
Copper plays a critical role in controlling greenhouse gas emissions as it is a key component of the particulate methane monooxygenase and nitrous oxide reductase. Some methanotrophs excrete methanobactin (MB) that has an extremely high copper affinity. As a result, MB may limit the ability of other microbes to gather copper, thereby decreasing their activity as well as impacting microbial community composition. Here, we show using forest soil microcosms that multiple forms of MB; MB from Methylosinus trichosporium OB3b (MB-OB3b) and MB from Methylocystis sp. strain SB2 (MB-SB2) increased nitrous oxide (N2O) production as well caused significant shifts in microbial community composition. Such effects, however, were mediated by the amount of copper in the soils, with low-copper soil microcosms showing the strongest response to MB. Furthermore, MB-SB2 had a stronger effect, likely due to its higher affinity for copper. The presence of either form of MB also inhibited nitrite reduction and generally increased the presence of genes encoding for the iron-containing nitrite reductase (nirS) over the copper-dependent nitrite reductase (nirK). Lastly, these data indicate the methanotrophic-mediated production of MB can significantly impact multiple steps of denitrification, as well as have broad effects on microbial community composition of forest soils.
Research Organization:
University of Michigan, Ann Arbor, MI (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC)
Grant/Contract Number:
SC0020174
OSTI ID:
1991190
Alternate ID(s):
OSTI ID: 1995609
Journal Information:
Environmental Microbiology, Journal Name: Environmental Microbiology Journal Issue: 11 Vol. 25; ISSN 1462-2912
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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