title: Paludibaculum fermentans gen. nov., sp. nov., a facultative anaerobe capable of dissimilatory iron reduction from subdivision 3 of the Acidobacteria.
abstract: A facultatively anaerobic, non-pigmented, non-spore-forming bacterium was isolated from a littoral wetland of a boreal lake located on Valaam Island, northern Russia, and designated strain P105(T). Cells of this isolate were Gram-negative, non-motile rods coated by S-layers with p2 lattice symmetry. Sugars were the preferred growth substrates. Under anoxic conditions, strain P105(T) was capable of fermentation and dissimilatory Fe(III) reduction. End products of fermentation were acetate, propionate and H2. Strain P105(T) was a mildly acidophilic, mesophilic organism, capable of growth at pH 4.0-7.2 (optimum pH 5.5-6.0) and at 4-35 °C (optimum at 20-28 °C). The major fatty acids were iso-C(15 : 0) and C(16 : 1)ω7c; the cells also contained significant amounts of 13,16-dimethyl octacosanedioic acid (isodiabolic acid). The major polar lipids were phosphocholine and phosphoethanolamine; the quinone was MK-8. The G+C content of the DNA was 60.5 mol%. 16S rRNA gene sequence analysis showed that strain P105(T) belongs to subdivision 3 of the Acidobacteria and is only distantly related (90% sequence similarity) to the only currently characterized member of this subdivision, Bryobacter aggregatus. The novel isolate differs from Bryobacter aggregatus in its cell morphology and ability to grow under anoxic conditions and in the presence of iron- and nitrate-reducing capabilities as well as quinone and polar lipid compositions. These differences suggest that strain P105(T) represents a novel genus and species, for which the name Paludibaculum fermentans gen. nov., sp. nov., is proposed. The type strain of Paludibaculum fermentans is P105(T) ( = DSM 26340(T) = VKM B-2878(T)).
authors.affiliation: S. N. Winogradsky Institute of Microbiology, Russian Academy of Sciences, Prospect 60-letya Octyabrya 7/2, Moscow 117312, Russia.
authors.forename: Irina S
authors.initials: IS
authors.lastname: Kulichevskaya
authors.affiliation: G. K. Skryabin Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences, Pushchino, Moscow region 142292, Russia.
authors.forename: Natalia E
authors.initials: NE
authors.lastname: Suzina
authors.affiliation: Royal Netherlands Institute for Sea Research, Department of Marine Organic Biogeochemistry, PO Box 59, 1790 AB Den Burg, The Netherlands.
authors.forename: W Irene C
authors.initials: WIC
authors.lastname: Rijpstra
authors.affiliation: Royal Netherlands Institute for Sea Research, Department of Marine Organic Biogeochemistry, PO Box 59, 1790 AB Den Burg, The Netherlands.
authors.forename: Jaap S Sinninghe
authors.initials: JSS
authors.lastname: Damsté
authors.affiliation: S. N. Winogradsky Institute of Microbiology, Russian Academy of Sciences, Prospect 60-letya Octyabrya 7/2, Moscow 117312, Russia.
authors.forename: Svetlana N
authors.initials: SN
authors.lastname: Dedysh
mesh_terms: D061271:Acidobacteria / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification; D015373:Bacterial Typing Techniques; D001482:Base Composition; D004269:DNA, Bacterial / Q000235:genetics; D004983:Ethanolamines / Q000737:chemistry; D005227:Fatty Acids / Q000737:chemistry; D007501:Iron / Q000378:metabolism*; D060106:Lakes / Q000382:microbiology*; D008969:Molecular Sequence Data; D010767:Phosphorylcholine / Q000737:chemistry; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012426:Russia; D017422:Sequence Analysis, DNA; D024482:Vitamin K 2 / Q000031:analogs & derivatives / Q000737:chemistry; D053833:Wetlands
chemical_list: D004269:DNA, Bacterial; D004983:Ethanolamines; D005227:Fatty Acids; D012336:RNA, Ribosomal, 16S; D010767:Phosphorylcholine; D024482:Vitamin K 2; C024223:vitamin MK 8; C005448:phosphorylethanolamine; D007501:Iron