globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1805000115
论文题名:
A bet-hedging strategy for denitrifying bacteria curtails their release of N2O
作者: Lycus P.; Soriano-Laguna M.J.; Kjos M.; Richardson D.J.; Gates A.J.; Milligan D.A.; Frostegård Å.; Bergaust L.; Bakken L.R.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2018
卷: 115, 期:46
起始页码: 11820
结束页码: 11825
语种: 英语
英文关键词: Bet hedging ; Denitrification ; Ecophysiology ; Nitrous oxide
Scopus关键词: nitrous oxide ; nitric acid derivative ; nitrous oxide ; oxidoreductase ; oxygen ; Article ; bacterial cell ; bacterial growth ; bacterial phenomena and functions ; bacterial strain ; bet hedging ; catalysis ; cell respiration ; controlled study ; denitrification ; denitrifying bacterium ; genetic transcription ; growth rate ; nonhuman ; oxygenation ; Paracoccus denitrificans ; phenotype ; priority journal ; synthesis ; wild type ; bacterium ; hypoxia ; metabolism ; physiology ; Bacteria ; Denitrification ; Hypoxia ; Nitrates ; Nitrous Oxide ; Oxidoreductases ; Oxygen ; Paracoccus denitrificans
英文摘要: When oxygen becomes limiting, denitrifying bacteria must prepare for anaerobic respiration by synthesizing the reductases NAR (NO3− → NO2−), NIR (NO2− → NO), NOR (2NO → N2O), and NOS (N2O → N2), either en bloc or sequentially, to avoid entrapment in anoxia without energy. Minimizing the metabolic burden of this precaution is a plausible fitness trait, and we show that the model denitrifier Paracoccus denitrificans achieves this by synthesizing NOS in all cells, while only a minority synthesize NIR. Phenotypic diversification with regards to NIR is ascribed to stochastic initiation of gene transcription, which becomes autocatalytic via NO production. Observed gas kinetics suggest that such bet hedging is widespread among denitrifying bacteria. Moreover, in response to oxygenation, P. denitrificans preserves NIR in the poles of nongrowing persister cells, ready to switch to anaerobic respiration in response to sudden anoxia. Our findings add dimensions to the regulatory biology of denitrification and identify regulatory traits that decrease N2O emissions. © 2018 National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163642
Appears in Collections:气候变化与战略

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作者单位: Lycus, P., Department of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, Ås, 1430, Norway; Soriano-Laguna, M.J., School of Biological Sciences, University of East Anglia, Norwich, NR4 7TJ, United Kingdom; Kjos, M., Department of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, Ås, 1430, Norway; Richardson, D.J., School of Biological Sciences, University of East Anglia, Norwich, NR4 7TJ, United Kingdom; Gates, A.J., School of Biological Sciences, University of East Anglia, Norwich, NR4 7TJ, United Kingdom; Milligan, D.A., Department of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, Ås, 1430, Norway; Frostegård, Å., Department of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, Ås, 1430, Norway; Bergaust, L., Department of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, Ås, 1430, Norway; Bakken, L.R., Department of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences, Ås, 1430, Norway

Recommended Citation:
Lycus P.,Soriano-Laguna M.J.,Kjos M.,et al. A bet-hedging strategy for denitrifying bacteria curtails their release of N2O[J]. Proceedings of the National Academy of Sciences of the United States of America,2018-01-01,115(46)
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