Environmental, genomic and taxonomic perspectives on methanotrophic Verrucomicrobia
Huub J. M. Op den Camp
Department of Microbiology, IWWR, Radboud University Nijmegen, Toernooiveld 1, NL-6525 ED Nijmegen, The Netherlands.
Search for more papers by this authorTajul Islam
Department of Biology and Centre for Geobiology, University of Bergen, P.O. Box 7800, N-5020 Bergen, Norway.
Search for more papers by this authorMatthew B. Stott
GNS Science, Extremophile Research Group, Private Bag 2000, 3352 Taupo, New Zealand.
Search for more papers by this authorHarry R. Harhangi
Department of Microbiology, IWWR, Radboud University Nijmegen, Toernooiveld 1, NL-6525 ED Nijmegen, The Netherlands.
Search for more papers by this authorAlexander Hynes
Department of Biological Sciences, University of Calgary, 2500 University Drive NW, Calgary, AB, Canada, T2N 1N4.
Search for more papers by this authorStefan Schouten
NIOZ Royal Netherlands Institute for Sea Research, Department of Marine Organic Biogeochemistry, P.O. Box 59, 1790 AB Den Burg, Texel, The Netherlands.
Search for more papers by this authorMike S. M. Jetten
Department of Microbiology, IWWR, Radboud University Nijmegen, Toernooiveld 1, NL-6525 ED Nijmegen, The Netherlands.
Search for more papers by this authorNils-Kåre Birkeland
Department of Biology and Centre for Geobiology, University of Bergen, P.O. Box 7800, N-5020 Bergen, Norway.
Search for more papers by this authorArjan Pol
Department of Microbiology, IWWR, Radboud University Nijmegen, Toernooiveld 1, NL-6525 ED Nijmegen, The Netherlands.
Search for more papers by this authorCorresponding Author
Peter F. Dunfield
Department of Biological Sciences, University of Calgary, 2500 University Drive NW, Calgary, AB, Canada, T2N 1N4.
E-mail [email protected]; Tel: (+1) 403 220 2469; Fax (+1) 403 289 9311.Search for more papers by this authorHuub J. M. Op den Camp
Department of Microbiology, IWWR, Radboud University Nijmegen, Toernooiveld 1, NL-6525 ED Nijmegen, The Netherlands.
Search for more papers by this authorTajul Islam
Department of Biology and Centre for Geobiology, University of Bergen, P.O. Box 7800, N-5020 Bergen, Norway.
Search for more papers by this authorMatthew B. Stott
GNS Science, Extremophile Research Group, Private Bag 2000, 3352 Taupo, New Zealand.
Search for more papers by this authorHarry R. Harhangi
Department of Microbiology, IWWR, Radboud University Nijmegen, Toernooiveld 1, NL-6525 ED Nijmegen, The Netherlands.
Search for more papers by this authorAlexander Hynes
Department of Biological Sciences, University of Calgary, 2500 University Drive NW, Calgary, AB, Canada, T2N 1N4.
Search for more papers by this authorStefan Schouten
NIOZ Royal Netherlands Institute for Sea Research, Department of Marine Organic Biogeochemistry, P.O. Box 59, 1790 AB Den Burg, Texel, The Netherlands.
Search for more papers by this authorMike S. M. Jetten
Department of Microbiology, IWWR, Radboud University Nijmegen, Toernooiveld 1, NL-6525 ED Nijmegen, The Netherlands.
Search for more papers by this authorNils-Kåre Birkeland
Department of Biology and Centre for Geobiology, University of Bergen, P.O. Box 7800, N-5020 Bergen, Norway.
Search for more papers by this authorArjan Pol
Department of Microbiology, IWWR, Radboud University Nijmegen, Toernooiveld 1, NL-6525 ED Nijmegen, The Netherlands.
Search for more papers by this authorCorresponding Author
Peter F. Dunfield
Department of Biological Sciences, University of Calgary, 2500 University Drive NW, Calgary, AB, Canada, T2N 1N4.
E-mail [email protected]; Tel: (+1) 403 220 2469; Fax (+1) 403 289 9311.Search for more papers by this authorThe GenBank/EMBL/DDBJ accession numbers for the pmoA sequences of strain Kam1 are FJ462788-FJ462791; and for the xoxF gene of strain SolV: FJ477305.
Summary
Aerobic methanotrophic bacteria are capable of utilizing methane as their sole energy source. They are commonly found at the oxic/anoxic interfaces of environments such as wetlands, aquatic sediments, and landfills, where they feed on methane produced in anoxic zones of these environments. Until recently, all known species of aerobic methanotrophs belonged to the phylum Proteobacteria, in the classes Gammaproteobacteria and Alphaproteobacteria. However, in 2007–2008 three research groups independently described the isolation of thermoacidophilic methanotrophs that represented a distinct lineage within the bacterial phylum Verrucomicrobia. Isolates were obtained from geothermal areas in Italy, New Zealand and Russia. They are by far the most acidophilic methanotrophs known, with a lower growth limit below pH 1. Here we summarize the properties of these novel methanotrophic Verrucomicrobia, compare them with the proteobacterial methanotrophs, propose a unified taxonomic framework for them and speculate on their potential environmental significance. New genomic and physiological data are combined with existing information to allow detailed comparison of the three strains. We propose the new genus Methylacidiphilum to encompass all three newly discovered bacteria.
Supporting Information
Fig. S1. Comparison of the verrucomicrobial methane monooxygenases based on ligands to Cu and Zn.
Fig. S2. Phylogenetic relationship among deduced PmoB and AmoB proteins.
Fig. S3. Phylogenetic relationship among deduced PmoC and AmoC proteins.
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