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dc.contributor.authorCarere, Carlo R.
dc.contributor.authorHards, Kiel
dc.contributor.authorHoughton, Karen M.
dc.contributor.authorPower, Jean F.
dc.contributor.authorMcDonald, Ben
dc.contributor.authorCollet, Christophe
dc.contributor.authorGapes, Daniel J.
dc.contributor.authorSparling, Richard
dc.contributor.authorBoyd, Eric S.
dc.contributor.authorCook, Gregory M.
dc.contributor.authorGreening, Chris
dc.contributor.authorStott, Matthew B.
dc.identifier.citationCarere, Carlo R. , Kiel Hards, Karen M. Houghton, Jean F. Power, Ben McDonald, Christophe Collet, Daniel J. Gapes, Richard Sparling, Eric S. Boyd, Gregory M. Cook, Chris Greening, and Matthew B. Stott. "Mixotrophy drives niche expansion of verrucomicrobial methanotrophs." The ISME Journal (August 2017). DOI:
dc.description.abstractAerobic methanotrophic bacteria have evolved a specialist lifestyle dependent on consumption of methane and other short-chain carbon compounds. However, their apparent substrate specialism runs contrary to the high relative abundance of these microorganisms in dynamic environments, where the availability of methane and oxygen fluctuates. In this work, we provide in situ and ex situ evidence that verrucomicrobial methanotrophs are mixotrophs. Verrucomicrobia-dominated soil communities from an acidic geothermal field in Rotokawa, New Zealand rapidly oxidised methane and hydrogen simultaneously. We isolated and characterised a verrucomicrobial strain from these soils, Methylacidiphilum sp. RTK17.1, and showed that it constitutively oxidises molecular hydrogen. Genomic analysis confirmed that this strain encoded two [NiFe]-hydrogenases (group 1d and 3b), and biochemical assays revealed that it used hydrogen as an electron donor for aerobic respiration and carbon fixation. While the strain could grow heterotrophically on methane or autotrophically on hydrogen, it grew optimally by combining these metabolic strategies. Hydrogen oxidation was particularly important for adaptation to methane and oxygen limitation. Complementary to recent findings of hydrogenotrophic growth by Methylacidiphilum fumariolicum SolV, our findings illustrate that verrucomicrobial methanotrophs have evolved to simultaneously utilise hydrogen and methane from geothermal sources to meet energy and carbon demands where nutrient flux is dynamic. This mixotrophic lifestyle is likely to have facilitated expansion of the niche space occupied by these microorganisms, allowing them to become dominant in geothermally influenced surface soils. Genes encoding putative oxygen-tolerant uptake [NiFe]-hydrogenases were identified in all publicly available methanotroph genomes, suggesting hydrogen oxidation is a general metabolic strategy in this guild.en_US
dc.titleMixotrophy drives niche expansion of verrucomicrobial methanotrophsen_US
mus.citation.journaltitleThe ISME Journalen_US
mus.identifier.categoryLife Sciences & Earth Sciencesen_US
mus.relation.collegeCollege of Agricultureen_US
mus.relation.collegeCollege of Letters & Scienceen_US
mus.relation.departmentMicrobiology & Immunology.en_US
mus.relation.universityMontana State University - Bozemanen_US

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