title: Halosimplex litoreum sp. nov., isolated from a marine solar saltern.
abstract: A halophilic archaeal strain, YGH94(T), was isolated from the Yinggehai marine solar saltern near the Shanya city of Hainan Province, China. Cells of the strain were observed to be short rods, stain Gram-negative and to form red-pigmented colonies on solid media. Strain YGH94(T) was found to grow at 25-50 °C (optimum 40 °C), at 0.9-4.8 M NaCl (optimum 3.1 M), at 0-1.0 M MgCl2 (optimum 0.05 M) and at pH 5.0-9.0 (optimum pH 7.5). The cells were found to lyse in distilled water and the minimal NaCl concentration to prevent cell-lysis was determined to be 5 % (w/v). The major polar lipids were identified as phosphatidylglycerol, phosphatidylglycerol phosphate methyl ester and four major glycolipids (disulfated mannosyl glucosyl diether, sulfated mannosyl glucosyl diether and two unidentified glycolipids chromatographically identical to glycolipids in Halosimplex carlsbadense JCM 11222(T)). Strain YGH94(T) was found to possess two heterogeneous 16S rRNA genes (rrnA and rrnB) and both are related to those of Hsx. carlsbadense JCM 11222(T) (92.7-98.6 % similarities), Halosimplex pelagicum R2(T) (94.6-99.2 % similarities) and Halosimplex rubrum R27(T) (92.9-98.8 % similarities). The rpoB' gene similarity between strain YGH94(T) and Hsx. carlsbadense JCM 11222(T), Hsx. pelagicum R2(T) and Hsx. rubrum R27(T) are 95.4, 94.9 and 95.1 %, respectively. The DNA G+C content of strain YGH94(T) was determined to be 64.0 mol%. Strain YGH94(T) showed low DNA-DNA relatedness (35-39 %) with the current three members of the genus Halosimplex. The phenotypic, chemotaxonomic and phylogenetic properties suggest that strain YGH94(T) (=CGMCC 1.12235(T) = JCM 18647(T)) represents a new species of the genus Halosimplex, for which the name Halosimplex litoreum sp. nov. is proposed.
authors.affiliation: School of Food and Biological Engineering, Jiangsu University, 301 Xuefu Road, Jingkou District, Zhenjiang, 212013, People's Republic of China.
authors.forename: Pan-Pan
authors.initials: PP
authors.lastname: Yuan
authors.forename: Jia-Qi
authors.initials: JQ
authors.lastname: Xu
authors.forename: Wen-Mei
authors.initials: WM
authors.lastname: Xu
authors.forename: Zhao
authors.initials: Z
authors.lastname: Wang
authors.forename: Shuai
authors.initials: S
authors.lastname: Yin
authors.forename: Dong
authors.initials: D
authors.lastname: Han
authors.forename: Wen-Jiao
authors.initials: WJ
authors.lastname: Zhang
authors.forename: Heng-Lin
authors.initials: HL
authors.lastname: Cui
mesh_terms: D015373:Bacterial Typing Techniques; D001482:Base Composition; D002681:China; D016000:Cluster Analysis; D003470:Culture Media / Q000737:chemistry; D003600:Cytosol / Q000737:chemistry; D019641:DNA, Archaeal / Q000737:chemistry / Q000235:genetics; D004275:DNA, Ribosomal / Q000737:chemistry / Q000235:genetics; D012321:DNA-Directed RNA Polymerases / Q000235:genetics; D004783:Environmental Microbiology; D006017:Glycolipids / Q000032:analysis; D006216:Halobacteriaceae / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification* / Q000502:physiology; D006863:Hydrogen-Ion Concentration; D015636:Magnesium Chloride / Q000378:metabolism; D008969:Molecular Sequence Data; D009693:Nucleic Acid Hybridization; D010743:Phospholipids / Q000032:analysis; D010802:Phylogeny; D010860:Pigments, Biological / Q000032:analysis; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA; D012965:Sodium Chloride / Q000378:metabolism; D013696:Temperature
chemical_list: D003470:Culture Media; D019641:DNA, Archaeal; D004275:DNA, Ribosomal; D006017:Glycolipids; D010743:Phospholipids; D010860:Pigments, Biological; D012336:RNA, Ribosomal, 16S; D015636:Magnesium Chloride; D012965:Sodium Chloride; D012321:DNA-Directed RNA Polymerases; C105078:RNA polymerase beta subunit