title: Nautilia profundicola sp. nov., a thermophilic, sulfur-reducing epsilonproteobacterium from deep-sea hydrothermal vents.
abstract: A thermophilic, strictly anaerobic, sulfur-reducing epsilonproteobacterium (strain AmH(T)) isolated from deep-sea hydrothermal vents is described. Cells were motile, Gram-negative rods. Growth was observed at 30-55 degrees C, pH 6.0-9.0 and 2-5 % (w/v) NaCl. Chemolithoautotrophic growth occurred with molecular hydrogen or formate as the electron donor and elemental sulfur as the electron acceptor, producing hydrogen sulfide. Heterotrophic and mixotrophic growth occurred with formate as a source of carbon. The dominant phospholipid fatty acids were C(18 : 1)omega7c (73.26 % of the total), C(16 : 1)omega7c (12.70 %) and C(16 : 0) (12.27 %). The genomic DNA G+C content was 33.5 mol%. Phylogenetic analysis based on 16S rRNA gene sequences placed strain AmH(T) within the family Nautiliaceae of the Epsilonproteobacteria. DNA-DNA hybridization experiments between strain AmH(T) and Nautilia lithotrophica DSM 13520(T) revealed a level of relatedness of 34.6 % between the two strains. Based on physiological and phylogenetic characteristics, strain AmH(T) is considered to represent a novel species of the genus Nautilia, for which the name Nautilia profundicola sp. nov. is proposed. The type strain is AmH(T) (=ATCC BAA-1463(T) =DSM 18972(T)).
authors.affiliation: University of Delaware, College of Marine Studies, Lewes, DE 19958, USA.
authors.forename: Julie L
authors.initials: JL
authors.lastname: Smith
authors.forename: Barbara J
authors.initials: BJ
authors.lastname: Campbell
authors.forename: Thomas E
authors.initials: TE
authors.lastname: Hanson
authors.forename: Chuanlun L
authors.initials: CL
authors.lastname: Zhang
authors.forename: S Craig
authors.initials: SC
authors.lastname: Cary
mesh_terms: D001482:Base Composition; D004269:DNA, Bacterial / Q000737:chemistry; D020565:Epsilonproteobacteria / Q000737:chemistry / Q000145:classification* / Q000235:genetics / Q000502:physiology*; D005227:Fatty Acids / Q000378:metabolism; D005561:Formates / Q000378:metabolism; D008969:Molecular Sequence Data; D009792:Oceans and Seas; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D013045:Species Specificity; D013455:Sulfur / Q000378:metabolism*; D013696:Temperature; D014871:Water Microbiology
chemical_list: D004269:DNA, Bacterial; D005227:Fatty Acids; D005561:Formates; D012336:RNA, Ribosomal, 16S; C030544:formic acid; D013455:Sulfur