title: Arcobacter anaerophilus sp. nov., isolated from an estuarine sediment and emended description of the genus Arcobacter.
abstract: Two strains (JC83, JC84(T)) of obligately anaerobic, H2S-producing bacteria were isolated from estuarine sediment samples collected from Gangasagar, West Bengal, India. Cells were Gram-stain-negative, non-motile rods. Both strains were positive for oxidase, negative for catalase, hydrolysed casein, reduced nitrate and utilized citrate. Both strains grew chemoorganoheterotrophically with optimal pH of 7-8 (range 7-10) and at 30 °C (range 25-37 °C). C16 : 1ω7c, C18 : 1ω7c, C16 : 0 and C12 : 0 were the major fatty acids of both strains with minor amounts of C14 : 0, C12 : 0 3-OH and C18 : 0. Polar lipids of both strains included diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, phosphatidylserine, phosphatidylcholine, phosphatidylinositol, an unidentified aminolipid (AL2), an unidentified phospholipid (PL2) and an unidentified lipid (L3). MK-6 was the major respiratory quinone. The DNA G+C content of strains JC83 and JC84(T) was 25.0 and 24.6 mol%, respectively. The strains showed DNA reassociation >85 % (86.0±0.5 %) (based on DNA-DNA hybridization). Based on 16S rRNA gene sequence analysis, both strains were identified as belonging to the family Campylobacteraceae of the class Epsilonproteobacteria with Arcobacter marinus CL-S1(T) (95.4 % sequence similarity) as their closest phylogenetic neighbour. On the basis of morphological, physiological and chemotaxonomic characteristics as well as phylogenetic analysis, strains JC83 and JC84(T) are considered to represent a novel species, for which the name Arcobacter anaerophilus sp. nov. is proposed. The type strain is JC84(T) ( = KCTC 15071(T) = MTCC 10956(T) = DSM 24636(T)). An emended description of the genus Arcobacter is provided.
authors.affiliation: Department of Plant Sciences, School of Life Science, University of Hyderabad, Hyderabad-500046, India.
authors.forename: T S
authors.initials: TS
authors.lastname: Sasi Jyothsna
authors.affiliation: Bacterial Discovery laboratory, Centre for Environment, Institute of Science & Technology, Jawaharlal Nehru Technological University Hyderabad, Hyderabad-500085, India.
authors.forename: K
authors.initials: K
authors.lastname: Rahul
authors.affiliation: Bacterial Discovery laboratory, Centre for Environment, Institute of Science & Technology, Jawaharlal Nehru Technological University Hyderabad, Hyderabad-500085, India.
authors.forename: E V V
authors.initials: EVV
authors.lastname: Ramaprasad
authors.affiliation: Bacterial Discovery laboratory, Centre for Environment, Institute of Science & Technology, Jawaharlal Nehru Technological University Hyderabad, Hyderabad-500085, India.
authors.forename: Ch
authors.initials: C
authors.lastname: Sasikala
authors.affiliation: Department of Plant Sciences, School of Life Science, University of Hyderabad, Hyderabad-500046, India.
authors.forename: Ch V
authors.initials: CV
authors.lastname: Ramana
mesh_terms: D020640:Arcobacter / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification; D015373:Bacterial Typing Techniques; D001482:Base Composition; D004269:DNA, Bacterial / Q000235:genetics; D063366:Estuaries; D005227:Fatty Acids / Q000737:chemistry; D005798:Genes, Bacterial; D019015:Geologic Sediments / Q000382:microbiology*; D006862:Hydrogen Sulfide / Q000378:metabolism; D007194:India; D008969:Molecular Sequence Data; D009693:Nucleic Acid Hybridization; D010743:Phospholipids / Q000737:chemistry; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA; D024482:Vitamin K 2 / Q000031:analogs & derivatives / Q000737:chemistry
chemical_list: D004269:DNA, Bacterial; D005227:Fatty Acids; D010743:Phospholipids; D012336:RNA, Ribosomal, 16S; D024482:Vitamin K 2; C042455:menaquinone 6; D006862:Hydrogen Sulfide