title: Characterization of the psychrotolerant acetogen strain SyrA5 and the emended description of the species Acetobacterium carbinolicum.
abstract: A psychrotolerant, obligate anaerobic, acetogenic bacterium designated strain SyrA5 was isolated from black anoxic sediment of a brackish fjord. Cells were Gram-positive, non-sporeforming rods. The isolate utilized H(2)/CO(2), CO, fructose, glucose, ethanol, ethylene glycol, glycerol, pyruvate, lactate, betaine and the methyl-groups of several methoxylated benzoic derivatives such as syringate, trimethoxybenzoate and vallinate. The optimum temperature for growth was 29 degrees C, whilst slow growth occurred at 2 degrees C. The strain grew optimally with NaCl concentrations below 2.7% (w/v), but growth occurred up to 4.3% (w/v) NaCl. Growth was observed in the range from pH 5.9 to 8.5, optimum at pH 8. The G+C content was 44.1 mol%. Based upon 16S rRNA gene sequence analysis and DNA-DNA reassociation studies, the organism was classified in the genus Acetobacterium. Strain SyrA5 shared a 16S rRNA sequence similarity with A. carbinolicum of 100%, a fthfs gene (which codes for the N5,N10 tetrahydrofolate synthetase) sequence identity of 98.5-98.7% (amino acid sequence similarities were 99.4-100%) and a RNA-DNA hybridization homology of 64-68%. Despite a number of phenotypic differences between strain SyrA5 and A. carbinolicum we propose including strain SyrA5 as a subspecies of A. carbinolicum for which we propose the name Acetobacterium carbinolicum subspecies kysingense. The type strain is SyrA5 (=DSM 16427(T), ATCC BAA-990).
authors.affiliation: Department of Microbiology, Institute of Biological Sciences, University of Aarhus, Dk-8000, Aarhus C, Denmark.
authors.forename: Maiken
authors.initials: M
authors.lastname: Paarup
authors.forename: Michael W
authors.initials: MW
authors.lastname: Friedrich
authors.forename: Brian J
authors.initials: BJ
authors.lastname: Tindall
authors.forename: Kai
authors.initials: K
authors.lastname: Finster
mesh_terms: D045855:Acetobacterium / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D001482:Base Composition; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D003718:Denmark; D019015:Geologic Sediments / Q000382:microbiology; D008854:Microscopy, Electron; D010641:Phenotype; D010802:Phylogeny; D013045:Species Specificity
chemical_list: D004269:DNA, Bacterial