Sulfurimonas aquatica sp. nov., a sulfur-oxidizing bacterium isolated from water of a brackish lake.

A novel chemolithoautotrophic bacterium, strain H1576, was isolated from water of a brackish lake. Strain H1576 grew aerobically on inorganic sulfur compounds. Hydrogen gas did not support autotrophic growth, and heterotrophic growth was not observed. Cells were rod shaped, motile, 1.5-2.7 μm in length and 0.6-0.7 μm in width. Growth was observed at 3-22 °C with an optimum growth temperature of 13-15 °C. The pH range for growth was 6.0-7.4 with an optimum pH of 6.6-6.8. Major fatty acids were summed feature 3 (Cω7c and/or Cω6c). The complete genome of strain H1576 consists of a circular chromosome and a plasmid, with total length of 2.8 Mbp and G+C content of 46.4 mol%. Phylogenetic analyses indicated that strain H1576 belongs to the genus Sulfurimonas but distinct from representatives of existing species. On the basis of genomic and phenotypic characteristics, a new species named Sulfurimonas aquatica sp. nov. is proposed with the type strain of strain H1576 (= BCRC 81254 = JCM 35004).