title: Psychromonas hadalis sp. nov., a novel piezophilic bacterium isolated from the bottom of the Japan Trench.
abstract: An obligately piezophilic bacterium was isolated from sediment collected from the bottom of the Japan Trench at a depth of 7542 m. The isolated strain, designated K41G(T), was closely affiliated with members of the genus Psychromonas on the basis of 16S rRNA gene sequence analysis. Levels of DNA-DNA relatedness between strain K41G(T) and Psychromonas reference strains were significantly lower than that accepted as the phylogenetic definition of a species. The optimal temperature and pressure for growth of strain K41G(T) were 6 degrees C and 60 MPa, respectively. The DNA G+C content was 39.1 mol%. Whole-cell fatty acids consisted of significant amounts of unsaturated fatty acids C(16 : 1) (37 %) and C(14 : 1) (17 %), saturated fatty acid C(16 : 0) (31 %) and polyunsaturated fatty acid C(22 : 6) (8 %). Based on the taxonomic differences observed, strain K41G(T) is considered to represent a novel obligately piezophilic Psychromonas species. The name Psychromonas hadalis (type strain, K41G(T)=JCM 11830(T)=ATCC BAA-638(T)) is proposed. This is the second species of obligately piezophilic bacteria to be proposed in the genus Psychromonas.
authors.affiliation: Extremobiosphere Research Center, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka 237-0061, Japan.
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Nogi
authors.affiliation: Extremobiosphere Research Center, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka 237-0061, Japan.
authors.forename: Shoichi
authors.initials: S
authors.lastname: Hosoya
authors.affiliation: Extremobiosphere Research Center, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka 237-0061, Japan.
authors.forename: Chiaki
authors.initials: C
authors.lastname: Kato
authors.affiliation: Extremobiosphere Research Center, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka 237-0061, Japan.
authors.forename: Koki
authors.initials: K
authors.lastname: Horikoshi
mesh_terms: D015373:Bacterial Typing Techniques; D001482:Base Composition; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D004275:DNA, Ribosomal / Q000737:chemistry / Q000235:genetics; D005227:Fatty Acids / Q000032:analysis; D020563:Gammaproteobacteria / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification* / Q000502:physiology; D020459:Genes, rRNA; D019015:Geologic Sediments / Q000382:microbiology*; D006874:Hydrostatic Pressure; D007564:Japan; D008969:Molecular Sequence Data; D009693:Nucleic Acid Hybridization; D010802:Phylogeny; D012329:RNA, Bacterial / Q000235:genetics; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012623:Seawater / Q000382:microbiology*; D017422:Sequence Analysis, DNA; D012689:Sequence Homology, Nucleic Acid; D013696:Temperature
chemical_list: D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D005227:Fatty Acids; D012329:RNA, Bacterial; D012336:RNA, Ribosomal, 16S