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Labilibaculum manganireducens gen. nov., sp. nov. and Labilibaculum filiforme sp. nov., Novel Bacteroidetes Isolated from Subsurface Sediments of the Baltic Sea
Vandieken, V.; Marshall, I.P.G.; Niemann, H.; Engelen, B.; Cypionka, H. (2018). Labilibaculum manganireducens gen. nov., sp. nov. and Labilibaculum filiforme sp. nov., Novel Bacteroidetes Isolated from Subsurface Sediments of the Baltic Sea. Front. Microbiol. 8: 2614. https://dx.doi.org/10.3389/fmicb.2017.02614
In: Frontiers in Microbiology. Frontiers Media: Lausanne. ISSN 1664-302X, meer
Peer reviewed article  

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Author keywords
    International Ocean Discovery Program; deep biosphere; Baltic Sea; salinity tolerance; iron and manganese reduction; fermentation

Auteurs  Top 
  • Vandieken, V.
  • Marshall, I.P.G.
  • Niemann, H., meer
  • Engelen, B.
  • Cypionka, H.

Abstract
    Microbial communities in deep subsurface sediments are challenged by the decreasein amount and quality of organic substrates with depth. In sediments of the BalticSea, they might additionally have to cope with an increase in salinity from ions thathave diffused downward from the overlying water during the last 9000 years. Here,we report the isolation and characterization of four novel bacteria of the Bacteroidetesfrom depths of 14–52m below seafloor (mbsf) of Baltic Sea sediments sampled duringInternational Ocean Discovery Program (IODP) Expedition 347. Based on physiological,chemotaxonomic and genotypic characterization, we propose that the four strainsrepresent two new species within a new genus in the family Marinifilaceae, withthe proposed names Labilibaculum manganireducens gen. nov., sp. nov. (type strain59.10-2MT) and Labilibaculum filiforme sp. nov. (type strains 59.16BT) with additionalstrains of this species (59.10-1M and 60.6M). The draft genomes of the two type strainshad sizes of 5.2 and 5.3Mb and reflected the major physiological capabilities. The strainsshowed gliding motility, were psychrotolerant, neutrophilic and halotolerant. Growth byfermentation of mono- and disaccharides as well as pyruvate, lactate and glycerol wasobserved. During glucose fermentation, small amounts of electron equivalents weretransferred to Fe(III) by all strains, while one of the strains also reduced Mn(IV). Thereby,the four strains broaden the phylogenetic range of prokaryotes known to reducemetals tothe group of Bacteroidetes. Halotolerance and metal reduction might both be beneficialfor survival in deep subsurface sediments of the Baltic Sea.

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