title: Natrinema ejinorense sp. nov., isolated from a saline lake in Inner Mongolia, China.
abstract: A Gram-negative, non-motile, neutrophilic, pleomorphic and extremely halophilic archaeon, strain EJ-57T, was isolated from saline Lake Ejinor in Inner Mongolia, China. Strain EJ-57T was able to grow at 25-50 degrees C, required at least 1.8 M NaCl for growth (optimum at 3.4 M NaCl) and grew over a pH range from 6.0 to 8.5 (optimum at pH 7.0). Hypotonic treatment with less than 1.5 M NaCl caused cell lysis. Analysis of the almost complete 16S rRNA gene sequence indicated that the isolate represented a member of the genus Natrinema in the family Halobacteriaceae. Strain EJ-57T was most closely related to Natrinema versiforme JCM 10478T (96.2% sequence similarity), Natrinema pallidum NCIMB 777T (95.9% sequence similarity), Natrinema altunense JCM 12890T (95.8% sequence similarity) and Natrinema pellirubrum NCIMB 786T (95.5 % sequence similarity). However, DNA-DNA hybridization experiments showed that strain EJ-57T was not related to these species, with levels of DNA-DNA relatedness equal to or below 39%. The major polar lipids of the isolate were C20C20 and C20C25 derivatives of phosphatidylglycerol, phosphatidylglycerol phosphate methyl ester and the disulfated glycolipid S2-DGA-1. The G+C content of the genomic DNA was 64.7 mol%. Comparative analysis of phenotypic characteristics between strain EJ-57T and recognized Natrinema species supported the conclusion that EJ-57T represents a novel species within this genus, for which the name Natrinema ejinorense sp. nov. is proposed. The type strain is EJ-57T (=CECT 7144T=JCM 13890T=CGMCC 1.6202T).
authors.affiliation: Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain.
authors.forename: A M
authors.initials: AM
authors.lastname: Castillo
authors.affiliation: Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain.
authors.forename: M C
authors.initials: MC
authors.lastname: Gutiérrez
authors.affiliation: Noda Institute for Scientific Research, 399 Noda, Noda-shi, Chiba-ken 278-0037, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Kamekura
authors.affiliation: State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, 100080 Beijing, China.
authors.forename: Y
authors.initials: Y
authors.lastname: Xue
authors.affiliation: State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, 100080 Beijing, China.
authors.forename: Y
authors.initials: Y
authors.lastname: Ma
authors.affiliation: Department of Biotechnology, University of the Western Cape, Bellville 7535, Cape Town, South Africa.
authors.forename: D A
authors.initials: DA
authors.lastname: Cowan
authors.affiliation: Genencor International BV, Archimedesweg 30, 2333 CN Leiden, The Netherlands.
authors.forename: B E
authors.initials: BE
authors.lastname: Jones
authors.affiliation: Department of Infection, Immunity and Inflammation, University of Leicester, Leicester LE1 9HN, UK.
authors.forename: W D
authors.initials: WD
authors.lastname: Grant
authors.affiliation: Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Ventosa
mesh_terms: D001482:Base Composition; D050260:Carbohydrate Metabolism; D002681:China; D019641:DNA, Archaeal / Q000737:chemistry / Q000302:isolation & purification; D004275:DNA, Ribosomal / Q000737:chemistry / Q000302:isolation & purification; D005780:Gelatin / Q000378:metabolism; D020459:Genes, rRNA; D006216:Halobacteriaceae / Q000145:classification* / Q000166:cytology / Q000302:isolation & purification* / Q000502:physiology; D006862:Hydrogen Sulfide / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D008055:Lipids / Q000032:analysis; D008969:Molecular Sequence Data; D009068:Movement; D009693:Nucleic Acid Hybridization; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012462:Saline Solution, Hypertonic; D017422:Sequence Analysis, DNA; D012689:Sequence Homology, Nucleic Acid; D012965:Sodium Chloride / Q000378:metabolism; D013213:Starch / Q000378:metabolism; D013696:Temperature; D014871:Water Microbiology
chemical_list: D019641:DNA, Archaeal; D004275:DNA, Ribosomal; D008055:Lipids; D012336:RNA, Ribosomal, 16S; D012462:Saline Solution, Hypertonic; D012965:Sodium Chloride; D005780:Gelatin; D013213:Starch; D006862:Hydrogen Sulfide