Genomic composition and dynamics among Methanomicrobiales predict adaptation to contrasting environments
- Arizona State Univ., Tempe, AZ (United States); Aarhus Univ. (Denmark)
- National Inst. of Advanced Industrial Science and Technology (AIST), Ibaraki (Japan)
- USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Japan Agency for Marine-Earth Science and Technology, Kanagawa (Japan)
- Appalachian State Univ., Boone, NC (United States)
- Cornell Univ., Ithaca, NY (United States)
- Univ. of Illinois, Urbana-Champaign, IL (United States)
- Arizona State Univ., Tempe, AZ (United States)
Members of the order Methanomicrobiales are abundant, and sometimes dominant, hydrogenotrophic (H2-CO2 utilizing) methanoarchaea in a broad range of anoxic habitats. In spite of their key roles in greenhouse gas emissions and waste conversion to methane, little is known about the physiological and genomic bases for their widespread distribution and abundance. In this work, we compared the genomes of nine diverse Methanomicrobiales strains, examined their pangenomes, reconstructed gene flow and identified genes putatively mediating their success across different habitats. Most strains slowly increased gene content whereas one, Methanocorpusculum labreanum, evidenced genome downsizing. Peat-dwelling Methanomicrobiales showed adaptations centered on improved transport of scarce inorganic nutrients and likely use H+ rather than Na+ transmembrane chemiosmotic gradients during energy conservation. In contrast, other Methanomicrobiales show the potential to concurrently use Na+ and H+ chemiosmotic gradients. Analyses also revealed that the Methanomicrobiales lack a canonical electron bifurcation system (MvhABGD) known to produce low potential electrons in other orders of hydrogenotrophic methanogens. Additional putative differences in anabolic metabolism suggest that the dynamics of interspecies electron transfer from Methanomicrobiales syntrophic partners can also differ considerably. Altogether, our findings suggest profound differences in electron trafficking in the Methanomicrobiales compared with other hydrogenotrophs, and warrant further functional evaluations.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Biological and Environmental Research (BER)
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1379646
- Journal Information:
- The ISME Journal, Journal Name: The ISME Journal Journal Issue: 1 Vol. 11; ISSN 1751-7362
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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