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1 Pacific Institute of Bioorganic Chemistry of the Far-Eastern Branch of the Russian Academy of Sciences, Prospekt 100 Let Vladivostoku 159, 690022 Vladivostok, Russia
2 Tokyo Research Laboratories, Kyowa Hakko Kogyo Co. Ltd, 3-6-6 Asahi-machi, Machida-shi, Tokyo 194-8533, Japan
3 BCCM/LMG Bacteria Collection, Laboratory of Microbiology, Ghent University, Ledeganckstraat 35, B-9000 Ghent, Belgium
4 Institute of Marine Biology of the Far-Eastern Branch of the Russian Academy of Sciences, Pal'chevskogo Street 17, 690032 Vladivostok, Russia
Correspondence
Olga I. Nedashkovskaya
olganedashkovska{at}piboc.dvo.ru
or
olganedashkovska{at}yahoo.com
| ABSTRACT |
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-galactosidase-positive. From the results of 16S rDNA sequence analysis, strain KMM 3524T was found to be related closely to Salegentibacter salegens (98·1 %). DNADNA homology between strains KMM 3524T and S. salegens DSM 5424T was 38 %; this showed clearly that the holothurian isolate KMM 3524T belongs to a novel species of the genus Salegentibacter for which the name Salegentibacter holothuriorum sp. nov. is proposed, with KMM 3524T (=NBRC 100249T=LMG 21968T) as the type strain.
The GenBank/EMBL/DDBJ accession number for the 16S rDNA sequence of Salegentibacter holothuriorum KMM 3524T is AB116148.
| MAIN TEXT |
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An unknown marine bacterium, strain KMM 3524T, was isolated from the edible holothurian Apostichopus japonicus inhabiting the Sea of Japan. The 16S rDNA sequence obtained in this study revealed that strain KMM 3524T belongs to the genus Salegentibacter. DNADNA hybridization, phenotypic and chemotaxonomic data indicated clearly that the holothurian isolate represents a novel species of the genus Salegentibacter, for which the name Salegentibacter holothuriorum sp. nov. is proposed.
Strain KMM 3524T was isolated aseptically from the holothurian A. japonicus, collected in Troitsa Bay, Gulf of Peter the Great, Sea of Japan (Pacific Ocean), from a depth of 8 m (salinity, 33
; temperature, 12 °C), in November 1997. For strain isolation, 0·1 ml tissue homogenate was transferred onto plates that contained marine agar 2216 (Difco). After primary isolation and purification, strains were cultivated at 28 °C on the same medium and stored at 80 °C in marine broth (Difco) supplemented with 20 % (v/v) glycerol.
The 16S rRNA gene sequence of strain KMM 3524T was determined by PCR amplification and direct sequencing (Hiraishi, 1992
). Conditions and reagents used for PCR amplification and sequencing of 16S rDNA were as described previously (Suzuki et al., 2001
). The sequence determined was aligned with an alignment based on the secondary-structure model that is maintained by the European small-subunit rRNA database (Van de Peer et al., 2000
), by using the profile-alignment program of CLUSTAL W software (Thompson et al., 1994
). Evolutionary distances were then computed with the DNADIST program in the PHYLIP package, version 3.572 (Felsenstein, 1995
) with the two-parameter model (Kimura, 1980
); a phylogenetic tree was constructed by using the neighbour-joining method (Saitou & Nei, 1987
). To evaluate phylogenetic trees, bootstrap analysis with 1000 sample replications was performed with the SEQBOOT and CONSENSE programs in the PHYLIP package, version 3.572.
Strain KMM 3524T showed highest 16S rDNA sequence similarity to S. salegens DSM 5424T (98·1 %), indicating that strain KMM 3524T is a member of the family Flavobacteriaceae and belongs to the genus Salegentibacter (Fig. 1
).
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-galactosidase, oxidase, catalase and alkaline phosphatase activities were tested according to the methods of Gerhardt et al. (1994)
Physiological, morphological and biochemical characteristics of the strains studied are listed in the species description and in Table 1
. Similarities in phenotypic characteristics support the inclusion of strain KMM 3524T in the genus Salegentibacter. However, strain KMM 3524T clearly differed from strains of S. salegens by its inability to grow in 12 % NaCl and to reduce nitrates to nitrites, its maximum growth temperature (37 °C), oxidation of lactose, fucose and N-acetylglucosamine, utilization of sucrose and lactose and resistance to streptomycin (Table 1
).
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7 (10·4 %), i17 : 1 (8·0 %) and i15 : 0 2-OH (7·9 %) and corresponded with the fatty acid composition of S. salegens DSM 5424T, determined under the same conditions (data not shown). Lipids were extracted according to the method of Bligh & Dyer (1959)
For determination of DNA G+C content and DNADNA binding values, DNA was prepared from cells that had been cultivated on marine agar (Difco) for 2448 h at 25 °C, according to the DNA extraction protocol of Pitcher et al. (1989)
as modified by Leisner et al. (2002)
. The G+C content was determined [by using the HPLC method of Mesbah et al. (1989)
] to be 36·8 mol%, a value that is analogous to that described for S. salegens. DNADNA hybridizations were performed by using the microplate method and fluorescence measurements for calculation of binding values, as described by Ezaki et al. (1989)
. Hybridizations between strains KMM 3524T and S. salegens DSM 5424T were performed at 35 °C in a hybridization mixture (2x SSC, 5x Denhardt's solution, 2·5 % dextran sulphate, 50 % formamide, 100 µg denaturated salmon sperm DNA ml1, 1250 ng biotinylated probe DNA ml1) and yielded a relatedness value of 38 %.
We can conclude that the genomic data, supported by phenotypic findings and chemotaxonomic characteristics, clearly classify strain KMM 3524T in the genus Salegentibacter as the type strain of a novel species, for which we propose the name Salegentibacter holothuriorum sp. nov.
Description of Salegentibacter holothuriorum sp. nov.
Salegentibacter holothuriorum (ho.lo.thu.ri.o'rum. N.L. gen. pl. n. holothuriorum of holothurians, sea cucumbers; bacterium isolated from holothurians).
Cells are Gram-negative, strictly aerobic, chemo-organotrophic, non-motile, asporogenic rods, 0·50·7 µm wide and 2·75·3 µm long. Oxidase-, catalase-,
-galactosidase- and alkaline phosphatase-positive. Colonies are circular, convex, shiny with entire edges and 13 mm in diameter on marine agar 2216. Yellow, non-diffusible pigments are produced. No growth is observed without Na+. Growth occurs in 18 % NaCl. Flexirubin pigments are absent. Growth is detected at 4 and 37 °C. Gelatin, starch, alginic acids, DNA and Tweens 20, 40 and 80 are hydrolysed, but agar, casein, cellulose (CM-cellulose and filter paper), chitin and urea are not. Acid is formed from galactose, glucose, lactose, maltose, fucose and N-acetylglucosamine, but not from arabinose, cellobiose, melibiose, raffinose, rhamnose, sorbose, sucrose, xylose, adonitol, dulcitol, glycerol, inositol, sorbitol or mannitol. Utilizes glucose, lactose and mannose, but not arabinose, sucrose, inositol, sorbitol, mannitol, citrate or malonate. H2S is produced. Nitrate is not reduced. No indole or acetoin (VogesProskauer reaction) is produced. Susceptible to ampicillin, benzylpenicillin, carbenicillin, oleandomycin, lincomycin and tetracycline. Resistant to kanamycin, neomycin, streptomycin, gentamicin and polymyxin B. Predominant cellular fatty acids are i15 : 0, i15 : 1, 15 : 0, 16 : 1
7, i17 : 1 and i15 : 0 2-OH. Major isoprenoid quinone is MK-6. Main polar lipid is phosphatidylethanolamine. DNA G+C content is 36·8 mol%.
The type strain is KMM 3524T (=NBRC 100249T=LMG 21968T). Isolated from the holothurian Apostichopus japonicus living in the Sea of Japan.
| ACKNOWLEDGEMENTS |
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