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1 Korea Research Institute of Bioscience and Biotechnology (KRIBB), PO Box 115, Yusong, Taejon, Korea
2 The Centre for Traditional Micro-organism Resources, Keimyung University, Shindang-Dong, Dalseo-gu, Daegu, Korea
Correspondence
Jung-Hoon Yoon
jhyoon{at}kribb.re.kr
| ABSTRACT |
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9c, C16 : 1
9c and C12 : 0 3-OH as the major fatty acids. The DNA G+C contents of strains SW-145T and SW-156T were 58 and 57 mol%, respectively. Phylogenetic analyses based on 16S rRNA gene sequences showed that strains SW-145T and SW-156T fell within the evolutionary radiation enclosed by the genus Marinobacter. The 16S rRNA gene sequences of strains SW-145T and SW-156T were 94·8 % similar. Strains SW-145T and SW-156T exhibited 16S rRNA gene sequence similarity levels of 94·398·1 and 95·497·7 %, respectively, with respect to the type strains of all Marinobacter species. Levels of DNADNA relatedness, together with 16S rRNA gene sequence similarity values, indicated that strains SW-145T and SW-156T are members of two species that are distinct from seven Marinobacter species with validly published names. On the basis of phenotypic properties and phylogenetic and genotypic distinctiveness, strains SW-145T (=KCTC 12185T=DSM 16070T) and SW-156T (=KCTC 12184T=DSM 16072T) should be placed in the genus Marinobacter as the type strains of two distinct novel species, for which the names Marinobacter flavimaris sp. nov. and Marinobacter daepoensis sp. nov. are proposed.
Details of the fatty acid compositions of the novel strains and related species are available as supplementary material in IJSEM Online.
| MAIN TEXT |
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Strains SW-145T and SW-156T were isolated by using the dilution plating technique on marine agar 2216 (MA) (Difco). Cell morphology was examined using light microscopy (Nikon E600) and transmission electron microscopy. The latter was used to examine flagellum type in cells from exponentially growing cultures. The Gram reaction was determined using the bioMérieux Gram stain kit according to the manufacturer's instructions. Growth under anaerobic conditions was determined after incubation in an anaerobic chamber using MA and MA supplemented with nitrate, both of which had been prepared anaerobically. Growth at various NaCl concentrations was investigated in marine broth 2216 (MB) (Difco) or trypticase soy broth (Difco). Growth in the absence of NaCl was investigated in trypticase soy broth lacking NaCl. Growth at various temperatures (450 °C) was measured on MA. Catalase and oxidase activities and hydrolysis of casein, starch and Tweens 20, 40, 60 and 80 were determined as described by Cowan & Steel (1965)
. Hydrolysis of aesculin, gelatin and urea and nitrate reduction were determined as described previously (Lanyi, 1987
) with the modification that artificial sea water was used. The artificial sea water contained (l1 distilled water) 23·6 g NaCl, 0·64 g KCl, 4·53 g MgCl2.6H2O, 5·94 g MgSO4.7H2O and 1·3 g CaCl2.2H2O (Levring, 1946
). Hydrolysis of hypoxanthine, tyrosine and xanthine was tested on MA plates using the substrate concentrations described previously (Cowan & Steel, 1965
). H2S production was tested as described previously (Bruns et al., 2001
). The API ZYM system (bioMérieux) was used to determine the activity of some enzymes. Acid production from carbohydrates was determined as described by Leifson (1963)
. Tests for the utilization of various substrates were performed as described previously (Yurkov et al., 1994
).
Cell biomass for respiratory lipoquinone analysis and for DNA extraction was obtained from MB cultures at 30 °C. M. hydrocarbonoclasticus DSM 8798T, M. aquaeolei DSM 11845T, M. litoralis KCCM 41591T, M. lipolyticus SM19T and M. excellens KMM 3809T were used as reference strains for DNADNA hybridization. Cell mass for DNA extraction from reference strains was obtained from MB cultures at 30 °C. Respiratory lipoquinones were analysed as described previously (Komagata & Suzuki, 1987
) using reversed-phase HPLC. Chromosomal DNA was isolated and purified according to the method described previously (Yoon et al., 1996
), with the exception that ribonuclease T1 was used together with ribonuclease A. The DNA G+C content was determined by the method of Tamaoka & Komagata (1984)
. DNA was hydrolysed and the resultant nucleotides were analysed by reversed-phase HPLC. For fatty acid methyl ester analysis, a loop of cell mass of strain SW-145T and of strain SW-156T was harvested from agar plates after incubation for 3 days at 30 °C on MA. The fatty acid methyl esters were extracted and prepared according to the standard protocol of the MIDI/Hewlett Packard Microbial Identification System (Sasser, 1990
). 16S rRNA genes were amplified by a PCR using two universal primers as described previously (Yoon et al., 1998
). Sequencing of the amplified 16S rRNA genes and phylogenetic analysis were performed as described by Yoon et al. (2003)
. DNADNA hybridization was performed fluorometrically by the method of Ezaki et al. (1989)
using photobiotin-labelled DNA probes and microdilution wells. Hybridization was performed with five replications for each sample. The highest and lowest values obtained in each sample were excluded and the remaining three values were used to calculate relatedness values. The DNA relatedness values quoted are the means of the three values.
Strains SW-145T and SW-156T were similar in terms of most morphological, cultural, physiological and biochemical characteristics. However, strain SW-145T grew at 4 °C, whereas strain SW-156T did not. Strain SW-145T grew in the presence of 20 % NaCl, but strain SW-156T did not. D-Fructose, glycerol and D-gluconate were utilized by strain SW-145T, but not by strain SW-156T. There were also differences in lipase activity (C14) and nitrate reduction between the two strains (Table 1
). Strains SW-145T and SW-156T are differentiated from other Marinobacter species by means of some phenotypic characteristics, including tolerance of NaCl, temperature and pH for growth and the ability to utilize some substrates (Table 1
). Other phenotypic characteristics are shown in Table 1
or are given in the species descriptions. Strains SW-145T and SW-156T contained ubiquinone-9 (approx. 85 and 96 %, respectively) as the predominant respiratory lipoquinone. Strains SW-145T and SW-156T had cellular fatty acid profiles containing large amounts of straight-chain, unsaturated and hydroxyl fatty acids. The major fatty acids detected in strain SW-145T were C16 : 0 (26·7 %), C18 : 1
9c (17·4 %), C16 : 1
9c (10·2 %), C12 : 0 3-OH (10·5 %) and C12 : 0 (9·1 %). Strain SW-156T contained the following major fatty acids: C16 : 0 (24·8 %), C18 : 1
9c (24·3 %), C16 : 1
9c (12·8 %), C12 : 0 3-OH (9·4 %) and C12 : 0 (7·1 %). These profiles were similar to those of the type strains of Marinobacter species described previously, although there were some differences in the compositions of some fatty acids (see the supplementary table in IJSEM Online). Two fatty acids, C16 : 1
7c and C19 : 0, were detected in M. excellens KMM 3809T, but not in strains SW-145T, SW-156T or other Marinobacter species. However, the two fatty acids were detected from the type strains of M. hydrocarbonoclasticus, M. aquaeolei and M. litoralis in the study by Gorshkova et al. (2003)
. This observation may have been caused by different experimental conditions, e.g. cultivation conditions or analytical equipment. The predominant respiratory lipoquinone and the cellular fatty acid profiles of strains SW-145T and SW-156T are consistent with those of Marinobacter species except M. lutaoensis (Yoon et al., 2003
; Gorshkova et al., 2003
; Shieh et al., 2003
). M. lutaoensis contained ubiquinone-8 as the predominant ubiquinone and iso-C15 : 0 as the major fatty acid (Shieh et al., 2003
). The DNA G+C contents of strains SW-145T and SW-156T were 58 and 57 mol%, respectively.
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-Proteobacteria. The level of 16S rRNA gene sequence similarity between strains SW-145T and SW-156T was 94·8 %. A neighbour-joining phylogenetic tree based on 16S rRNA gene sequences showed that strains SW-145T and SW-156T fell within the radiation of the cluster comprising Marinobacter species (Fig. 1
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Description of Marinobacter flavimaris sp. nov.
Marinobacter flavimaris (fla.vi.ma'ris. L. masc. adj. flavus yellow; L. gen. neut. n. maris of the sea; N.L. gen. masc. n. flavimaris of the Yellow Sea).
Cells are rods, 0·60·9x1·53·0 µm. Gram-negative. Non-spore-forming. Colonies are cream-coloured, smooth, circular to slightly irregular, low convex and 1·02·0 mm in diameter after 3 days cultivation at 30 °C on MA. The optimal pH for growth is 7·08·0; growth occurs at pH 5·5 but not at pH 5·0. Optimal growth occurs in the presence of 26 % (w/v) NaCl. Growth occurs in the presence of 20 % (w/v) NaCl but not in the presence of more than 21 % (w/v) NaCl. Growth occurs under anaerobic conditions on MA and MA supplemented with nitrate. Tweens 20, 40 and 60 are hydrolysed, but casein, hypoxanthine, tyrosine and xanthine are not. Acid is produced from D-fructose. Acid is not produced from the following sugars: adonitol, L-arabinose, D-cellobiose, D-galactose, D-glucose, lactose, maltose, D-mannitol, D-mannose, D-melezitose, melibiose, myo-inositol, D-raffinose, L-rhamnose, D-ribose, D-sorbitol, sucrose, D-trehalose and D-xylose. Glycerol, L-serine and hexadecane are not utilized as sole carbon and energy sources. The predominant respiratory lipoquinone is ubiquinone-9. The major fatty acids are C16 : 0, C18 : 1
9c, C16 : 1
9c and C12 : 0 3-OH. The DNA G+C content is 58 mol% (determined by HPLC).
The type strain, SW-145T (=KCTC 12185T=DSM 16070T), was isolated from sea water at Daepo Beach of the Yellow Sea in Korea.
Description of Marinobacter daepoensis sp. nov.
Marinobacter daepoensis (dae.po.en'sis. N.L. masc. adj. daepoensis of Daepo, the beach where the type strain was isolated).
Cells are rods, 0·60·8x1·53·0 µm. Gram-negative. Non-spore-forming. Colonies are cream-coloured, smooth, circular to slightly irregular, low convex and 1·02·0 mm in diameter after 3 days cultivation at 30 °C on MA. The optimal pH for growth is 7·08·0; growth occurs at pH 5·5 but not at pH 5·0. Optimal growth occurs in the presence of 26 % (w/v) NaCl. Growth occurs in the presence of 18 % (w/v) NaCl but not in the presence of more than 19 % (w/v) NaCl. Growth occurs under anaerobic conditions on MA and MA supplemented with nitrate. Tweens 20, 40 and 60 are hydrolysed, but casein, hypoxanthine, tyrosine and xanthine are not. Acid is not produced from the following sugars: adonitol, L-arabinose, D-cellobiose, D-fructose, D-galactose, D-glucose, lactose, maltose, D-mannitol, D-mannose, D-melezitose, melibiose, myo-inositol, D-raffinose, L-rhamnose, D-ribose, D-sorbitol, sucrose, D-trehalose and D-xylose. Glycerol, L-serine and hexadecane are not utilized as sole carbon and energy sources. The predominant respiratory lipoquinone is ubiquinone-9. The major fatty acids are C16 : 0, C18 : 1
9c, C16 : 1
9c and C12 : 0 3-OH. The DNA G+C content is 57 mol% (determined by HPLC).
The type strain, SW-156T (=KCTC 12184T=DSM 16072T), was isolated from sea water at Daepo Beach of the Yellow Sea in Korea.
| ACKNOWLEDGEMENTS |
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