Journal
SCIENCE
Volume 369, Issue 6507, Pages 1094-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.abb6310
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Funding
- U.S. Department of Energy (DOE), Office of Science, Biological and Environmental Research (BER)
- U.S. DOE [DE-AC05-76RLO 1830]
- University of Colorado Cancer Center's Genomics and Microarray Shared Resource (NCI) [P30CA046934]
- National Science Foundation [ACI-1532235, ACI-1532236]
- University of Colorado Boulder
- Colorado State University
- Genomic Science Program, U.S. DOE, Office of Science, BER as part of the Plant Microbe Interfaces Scientific Focus Area
- DOE [DE-AC05-00OR22725]
- OSU Center for Applied Plant Sciences Grant
- Genomic Science Program, U.S. DOE, Office of Science, BER [DE-SC0019338]
- U.S. Department of Energy (DOE) [DE-SC0019338] Funding Source: U.S. Department of Energy (DOE)
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Bacterial production of gaseous hydrocarbons such as ethylene and methane affects soil environments and atmospheric climate. We demonstrate that biogenic methane and ethylene from terrestrial and freshwater bacteria are directly produced by a previously unknown methionine biosynthesis pathway. This pathway, present in numerous species, uses a nitrogenase-like reductase that is distinct from known nitrogenases and nitrogenase-like reductases and specifically functions in C-S bond breakage to reduce ubiquitous and appreciable volatile organic sulfur compounds such as dimethyl sulfide and (2-methylthio)ethanol. Liberated methanethiol serves as the immediate precursor to methionine, while ethylene or methane is released into the environment. Anaerobic ethylene production by this pathway apparently explains the long-standing observation of ethylene accumulation in oxygen-depleted soils. Methane production reveals an additional bacterial pathway distinct from archaeal methanogenesis.
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