Methanonatronarchaeum thermophilum gen. nov., sp. nov. and 'Candidatus Methanohalarchaeum thermophilum', extremely halo(natrono)philic methyl-reducing methanogens from hypersaline lakes comprising a new euryarchaeal class Methanonatronarchaeia classis nov

International Journal of Systematic and Evolutionary Microbiology
Dimitry Y SorokinMark C M van Loosdrecht

Abstract

Methanogenic enrichments from hypersaline lakes at moderate thermophilic conditions have resulted in the cultivation of an unknown deep lineage of euryarchaeota related to the class Halobacteria. Eleven soda lake isolates and three salt lake enrichment cultures were methyl-reducing methanogens that utilize C1 methylated compounds as electron acceptors and H2 or formate as electron donors, but they were unable to grow on either substrates alone or to form methane from acetate. They are extreme halophiles, growing optimally at 4 M total Na+ and the first representatives of methanogens employing the 'salt-in' osmoprotective mechanism. The salt lake subgroup is neutrophilic, whereas the soda lake isolates are obligate alkaliphiles, with an optimum around pH 9.5. Both grow optimally at 50 °C. The genetic diversity inside the two subgroups is very low, indicating that the soda and salt lake clusters consist of a single genetic species each. The phylogenetic distance between the two subgroups is in the range of distant genera, whereas the distance to other euryarchaea is below 83 % identity of the 16S rRNA gene. These isolates and enriched methanogens, together with closely related environmental clones from hypersaline habitats (the S...Continue Reading

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Citations

Dec 11, 2019·Biochemical Society Transactions·Andrea Söllinger, Tim Urich
Sep 20, 2019·Microbiology and Molecular Biology Reviews : MMBR·Thomas D Mand, William W Metcalf
Jul 1, 2020·International Journal of Systematic and Evolutionary Microbiology·Aharon OrenMartha E Trujillo
Aug 22, 2020·FEMS Microbiology Letters·Christopher FeldewertAndreas Brune
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Feb 26, 2019·Nature Microbiology·Dimitry Y SorokinEugene V Koonin
Oct 18, 2020·FEMS Microbiology Letters·Suzanna L BräuerStephen H Zinder
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Mar 16, 2019·Current Opinion in Biotechnology·Zhe Lyu, William B Whitman
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