Abstract
AbstractAtmospheric methane oxidizing bacteria (atmMOB) constitute the sole biological sink for atmospheric methane. Still, the physiological basis allowing atmMOB to grow on air is not well understood. Here we assess the ability and strategies of seven methanotrophic species to grow with air as sole energy, carbon, and nitrogen source. Four species, including three outside the canonical atmMOB group USCα, enduringly oxidized atmospheric methane, carbon monoxide, and hydrogen during 12 months of growth on air. These four species exhibited distinct substrate preferences implying the existence of multiple metabolic strategies to grow on air. The estimated energy yields of the atmMOB were substantially lower than previously assumed necessary for cellular maintenance in atmMOB and other aerobic microorganisms. Moreover, the atmMOB also covered their nitrogen requirements from air. During growth on air, the atmMOB decreased investments in biosynthesis while increasing investments in trace gas oxidation. Furthermore, we confirm that a high apparent specific affinity for methane is a key characteristic of atmMOB. Our work shows that atmMOB grow on the trace concentrations of methane, carbon monoxide, and hydrogen present in air and outlines the metabolic strategies that enable atmMOB to mitigate greenhouse gases.
Funder
Norges Forskningsråd
Tromsø Research Foundation starting grant project Cells in the Cold 17_SG_ATT ATT
Publisher
Springer Science and Business Media LLC
Reference85 articles.
1. Forster, P. et al. in Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change (eds Masson-Delmotte, V. et al.) 923–1054 (Cambridge University Press, 2023).
2. Mar, K. A., Unger, C., Walderdorff, L. & Butler, T. Beyond CO2 equivalence: the impacts of methane on climate, ecosystems, and health. Environ. Sci. Policy 134, 127–136 (2022).
3. Ehhalt, D. H. The atmospheric cycle of methane. Tellus 26, 58–70 (1974).
4. Saunois, M. et al. The Global Methane Budget 2000–2017. Earth Syst. Sci. Data. 12, 1561–1623 (2020).
5. Rigby, M. et al. Role of atmospheric oxidation in recent methane growth. Proc. Natl Acad. Sci. 114, 5373–5377 (2017).
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献