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Authors: Han, Dongfei and Dedysh, Svetlana N and Liesack, Werner

The genus Methylocystis belongs to the class Alphaproteobacteria, the family Methylocystaceae, and encompasses aerobic methanotrophic bacteria with the serine pathway of carbon assimilation. All Methylocystis species are able to fix dinitrogen and several members of this genus are also capable of using acetate or ethanol in the absence of methane, which explains their wide distribution in various habitats. One additional trait that enables their survival in the environment is possession of two methane-oxidizing isozymes, the conventional particulate methane monooxygenase (pMMO) with low-affinity to substrate (pMMO1) and the high-affinity enzyme (pMMO2). Here, we report the finished genome sequence of Methylocystis bryophila S285, a pMMO2-possessing methanotroph from a Sphagnum-dominated wetland, and compare it to the genome of Methylocystis sp. strain SC2, which is the first methanotroph with confirmed high-affinity methane oxidation potential. The complete genome of Methylocystis bryophila S285 consists of a 4.53?Mb chromosome and one plasmid, 175?kb in size. The genome encodes two types of particulate MMO (pMMO1 and pMMO2), soluble MMO and, in addition, contains a pxmABC-like gene cluster similar to that present in some gammaproteobacterial methanotrophs. The full set of genes related to the serine pathway, the tricarboxylic acid cycle as well as the ethylmalonyl-CoA pathway is present. In contrast to most described methanotrophs including Methylocystis sp. strain SC2, two different types of nitrogenases, that is, molybdenum-iron and vanadium-iron types, are encoded in the genome of strain S285. This unique combination of genome-based traits makes Methylocystis bryophila well adapted to the fluctuation of carbon and nitrogen sources in wetlands.© The Author(s) 2018. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution.

Journal: Genome biology and evolution
DOI: 10.1093/gbe/evy025
Year: 2018

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