title: Halanaeroarchaeum sulfurireducens gen. nov., sp. nov., the first obligately anaerobic sulfur-respiring haloarchaeon, isolated from a hypersaline lake.
abstract: Anaerobic enrichments with acetate as electron donor and carbon source, and elemental sulfur as electron acceptor at 4 M NaCl using anaerobic sediments and brines from several hypersaline lakes in Kulunda Steppe (Altai, Russia) resulted in isolation in pure culture of four strains of obligately anaerobic haloarchae growing exclusively by sulfur respiration. Such metabolism has not yet been demonstrated in any known species of Halobacteria, and in the whole archaeal kingdom, acetate oxidation with sulfur as acceptor was not previously demonstrated. The four isolates had nearly identical 16S rRNA gene sequences and formed a novel genus-level branch within the family Halobacteriaceae. The strains had a restricted substrate range limited to acetate and pyruvate as electron donors and elemental sulfur as electron acceptor. In contrast to aerobic haloarchaea, the biomass of anaerobic isolates completely lacked the typical red pigments. Growth with acetate+sulfur was observed between 3-5 M NaCl and at a pH range from 6.7 to 8.0. The membrane core lipids were dominated by archaeols. On the basis of distinct physiological and phylogenetic data, the sulfur-respiring isolates represent a novel species of a new genus in the family Halobacteriaceae, for which the name Halanaeroarchaeaum sulfurireducens gen. nov., sp. nov. is proposed. The type strain of the type species is HSR2T (=JCM 30661T=UNIQEM U935T).
authors.affiliation: Winogradsky Institute of Microbiology, Research Centre of Biotechnology, Russian Academy of Sciences, Moscow, Russia.|Department of Biotechnology, TU Delft, The Netherlands.
authors.forename: Dimitry Y
authors.initials: DY
authors.lastname: Sorokin
authors.affiliation: Winogradsky Institute of Microbiology, Research Centre of Biotechnology, Russian Academy of Sciences, Moscow, Russia.
authors.forename: Ilya V
authors.initials: IV
authors.lastname: Kublanov
authors.affiliation: IAMC-CNR, Messina, Italy.
authors.forename: Mikhail M
authors.initials: MM
authors.lastname: Yakimov
authors.affiliation: NIOZ Royal Netherlands Institute for Sea Research, Department of Marine Microbiology and Biogeochemistry and Utrecht University, PO Box 59, 1790 AB Den Burg, Texel, The Netherlands.
authors.forename: W Irene C
authors.initials: WIC
authors.lastname: Rijpstra
authors.affiliation: NIOZ Royal Netherlands Institute for Sea Research, Department of Marine Microbiology and Biogeochemistry and Utrecht University, PO Box 59, 1790 AB Den Burg, Texel, The Netherlands.|Faculty of Geosciences, Department of Earth Sciences, Utrecht University, Utrecht, The Netherlands.
authors.forename: Jaap S
authors.initials: JS
authors.lastname: Sinninghe Damsté
mesh_terms: D001482:Base Composition; D019641:DNA, Archaeal / Q000235:genetics; D019015:Geologic Sediments / Q000382:microbiology; D016931:Halobacteriales / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification; D060106:Lakes / Q000382:microbiology*; D010084:Oxidation-Reduction; D010743:Phospholipids / Q000737:chemistry; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012426:Russia; D054712:Salinity; D012492:Salts; D017422:Sequence Analysis, DNA; D013455:Sulfur / Q000378:metabolism*
chemical_list: D019641:DNA, Archaeal; D010743:Phospholipids; D012336:RNA, Ribosomal, 16S; D012492:Salts; C017082:brine; D013455:Sulfur