Abyssibacter profundi gen. nov., sp. nov., a marine bacterium isolated from seawater of the Mariana Trench

Int J Syst Evol Microbiol. 2018 Nov;68(11):3424-3429. doi: 10.1099/ijsem.0.002999. Epub 2018 Sep 11.


A Gram-stain-negative, strictly aerobic, short-rod-shaped bacterium, motile by a single polar flagellum, designated OUC007T, was isolated from seawater at a depth of 1000 m in the Mariana Trench. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain OUC007T formed a lineage within the family Salinisphaeraceae that was distinct from the most closely related genera Oceanococcus and Salinisphaera, with 16S rRNA gene sequences similarities ranging from 89.3 to 90.8 %, respectively. Strain OUC007T grew with 0-7 % (w/v) NaCl (optimum, 2-3 %), at 10-45 °C (37 °C) and at pH 7.0-9.0 (7.0-8.0). The major respiratory quinone was ubiquinone-8 (Q-8). The polar lipids of strain OUC007T comprised one phosphatidylethanolamine and three unidentified polar lipids. The predominant fatty acid (more than 10 % of total fatty acids) was summed feature 8 (C18 : 1ω7c or/and C18 : 1ω6c). The DNA G+C content of strain OUC007T was 63.1 mol%. On the basis of polyphasic taxonomic analysis, the strain OUC007T is considered to represent a novel species in a new genus of the family Salinisphaeraceae, for which the name Abyssibacter profundi gen. nov., sp. nov. is proposed. The type strain is OUC007T (=KCTC 52933T=MCCC 1K03450T).

Keywords: Abyssibacter profundi; Mariana Trench; seawater.

MeSH terms

  • Bacterial Typing Techniques
  • Base Composition
  • DNA, Bacterial / genetics
  • Fatty Acids / chemistry
  • Gammaproteobacteria / classification*
  • Gammaproteobacteria / genetics
  • Gammaproteobacteria / isolation & purification
  • Pacific Ocean
  • Phosphatidylethanolamines / chemistry
  • Phospholipids / chemistry
  • Phylogeny*
  • RNA, Ribosomal, 16S / genetics
  • Seawater / microbiology*
  • Sequence Analysis, DNA
  • Ubiquinone / chemistry
  • Water Microbiology*


  • DNA, Bacterial
  • Fatty Acids
  • Phosphatidylethanolamines
  • Phospholipids
  • RNA, Ribosomal, 16S
  • Ubiquinone
  • phosphatidylethanolamine
  • ubiquinone 8