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1 Pacific Institute of Bioorganic Chemistry of the Far-Eastern Branch of the Russian Academy of Sciences, Pr. 100 Let Vladivostoku 159, 690022, Vladivostok, Russia
2 BCCM/LMG Bacteria Collection, Ghent University, Ledeganckstraat 35, B-9000 Ghent, Belgium
3 Laboratory of Microbiology, Ghent University, Ledeganckstraat 35, B-9000 Ghent, Belgium
4 Alfred-Wegener-Institüt für Polar- und Meeresforschung, Am Handelshfen 12, D-27570 Bremerhaven, Germany
Correspondence
Olga I. Nedashkovskaya
olganedashkovska{at}yahoo.com
| ABSTRACT |
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The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of Leeuwenhoekiella aequorea strains LMG 22550T and KMM 6066 are AJ278780 and AJ780980, respectively.
| MAIN TEXT |
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The genus Cytophaga was established by Winogradsky (1929)
and emended by Reichenbach (1989)
. Later, Nakagawa & Yamasato (1996)
proposed the restriction of this genus on the basis of 16S rRNA gene sequence phylogenetic analysis, and emended the genus description. Currently, the genus Cytophaga sensu stricto (aerobic, gliding, pigmented, cellulose-degrading bacteria) comprises two species: Cytophaga aurantiaca and Cytophaga hutchinsonii. Some marine bacteria previously included in the genus Cytophaga have been reclassified (Nakagawa & Yamasato, 1996
; Nakagawa et al., 1997
; Johansen et al., 1999
; Suzuki et al., 2001
; Barbeyron et al., 2001
; Nedashkovskaya et al., 2005
). At present, two misnamed species of the genus Cytophaga that were isolated from marine environments, [Cytophaga] fermentans and [Cytophaga] marinoflava, remain to be reclassified.
In this work, we report the isolation and identification of six novel halotolerant, Gram-negative, aerobic, gliding, yellow-pigmented marine bacteria. On the basis of the results of genotypic, chemotaxonomic and phenotypic analyses, it is clear that the isolates represent a novel species, with [C.] marinoflava as the nearest neighbour. Both taxa are here classified in a single novel genus, as Leeuwenhoekiella marinoflava gen. nov., comb. nov. and Leeuwenhoekiella aequorea sp. nov.
Strains LMG 22550T (=ANT 14T), LMG 22551 (=ANT 18d/2), LMG 22552 (=ANT 26b), LMG 22553 (=ANT 35/2) and LMG 22554 (=ANT 54b/2) were isolated previously from Antarctic sea-water samples at stations above Gunnerus Ridge and Astrid Ridge (Tan et al., 1999
), using enrichment in dialysis chambers (Tan, 1997
). Strain KMM 6066 (=LMG 22555) was isolated from the sea urchin Strongylocentrotus intermedius in Troitsa Bay, Gulf of Peter the Great, Sea of Japan. For the isolation of the latter strain, 0·1 ml tissue homogenate was transferred onto plates of 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 2216 (Difco) supplemented with 20 % (v/v) glycerol.
An almost-complete 16S rRNA gene sequence (1475 nt) of one representative of the Antarctic isolates, strain LMG 22550T, was determined previously in a study on the diversity of facultative oligotrophic bacteria from polar seas (Mergaert et al., 2001
). The sequence of strain KMM 6066 (1474 nt) was determined in the present study by following a procedure described previously (Vancanneyt et al., 2004
) and showed a similarity of 99·8 % with respect to LMG 22550T. The nearest phylogenetic neighbour of both strains was [C.] marinoflava ATCC 19326T (=LMG 1345T): the 16S rRNA gene sequence similarity was 97·1 %. The three strains formed a distinct lineage within the family Flavobacteriaceae, showing sequence similarity levels below 92·2 % with the genera Vitellibacter, Aequorivita, Arenibacter, Muricauda, Zobellia and Maribacter (Fig. 1
). These observations allow reclassification of members of the [C.] marinoflava branch within a novel genus.
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DNA (Sigma) was used as the calibration reference.
The DNA G+C contents were 3536 mol% for the novel isolates (LMG 22550T to LMG 22555) and 38 mol% for the type strain of [C.] marinoflava (LMG 1345T). DNADNA hybridizations were performed between strains LMG 22550T to LMG 22555 and [C.] marinoflava LMG 1345T with DNA prepared as described above. The microplate method was used as described by Ezaki et al. (1989)
and Goris et al. (1998)
, using an HTS7000 Bio Assay Reader (Perkin Elmer) for the fluorescence measurements. Biotinylated DNA was hybridized with single-stranded unlabelled DNA, non-covalently bound to microplate wells. Hybridizations were performed at 36 °C in a hybridization mixture [2x SSC, 5x Denhardt's solution, 2·5 % dextran sulphate, 50 % formamide, 100 µg denatured low-molecular-mass salmon sperm DNA ml1, 1250 ng biotinylated probe DNA ml1]. Hybridization levels of 79100 % were found between strains LMG 22550T to LMG 22555, which indicates that the strains constitute a single species. The latter strains had binding values of 914 % with [C.] marinoflava LMG 1345T. These data indicate that the novel isolates constitute a single species distinct from the latter misclassified species (Wayne et al., 1987
).
The analysis of fatty acid methyl esters was carried out according to the standard protocol of the Microbial Identification System (Microbial ID). The main cellular fatty acids of the strains studied were 15 : 0 iso, 15 : 1 iso G, 17 : 0 iso 3-OH, iso 17 : 1
9c and summed feature 3 (see Table 1
). [C.] marinoflava is distinguished from the novel isolates by a significantly larger amount of 17 : 0 iso 3-OH and smaller amount of iso 17 : 1
9c. Furthermore, the presence of minor amounts of 15 : 0 3-OH and the absence of anteiso 17 : 1
9c and summed feature 4 (Table 1
) fatty acids in the [C.] marinoflava whole-cell fatty acid profile support its differentiation from strains LMG 22550T to LMG 22555. Isoprenoid quinones were extracted from lyophilized cells and analysed as described previously (Nedashkovskaya et al., 2003d
). The major respiratory quinone was MK-6.
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Description of Leeuwenhoekiella gen. nov.
Leeuwenhoekiella [Leeu.wen.hoe.ki.el'la. N.L. fem. dim. n. Leeuwenhoekiella of Leeuwenhoek, named in honour of the famous Dutchman Antonie van Leeuwenhoek (16321723), discoverer of micro-organisms].
Rod-shaped cells, motile by gliding. Gram-negative. Endospores are not formed. Strictly aerobic. Produces non-diffusible yellow pigments. No flexirubins are formed. Chemo-organotrophic. Cytochrome oxidase-, catalase-,
-galactosidase- and alkaline phosphatase-positive. The major respiratory quinone is MK-6. The dominant cellular fatty acids (>5 %) are 15 : 0 iso, 15 : 1 iso G, 17 : 0 iso 3-OH, iso 17 : 1
9c and summed feature 3 (see Table 1
). According to 16S rRNA gene sequence phylogenetic analysis, the genus Leeuwenhoekiella is a member of the family Flavobacteriaceae. The type species is Leeuwenhoekiella marinoflava.
Description of Leeuwenhoekiella marinoflava comb. nov.
Leeuwenhoekiella marinoflava (ma.ri.no.fla'va. L. adj. marinus marine; L. adj. flavus golden yellow; N.L. fem. adj. marinoflava marine and yellow-pigmented).
Basonym: Cytophaga marinoflava (ex Colwell et al. 1966) Reichenbach 1989
.
The main characteristics are those as given for the genus and by Reichenbach (1989)
. In addition, growth is observed at 437 °C. Optimal temperature for growth is 2123 °C. Growth occurs at 015 % NaCl, with optimal growth at 13 % NaCl. Nitrate is not reduced. Indole, H2S and acetoin (VogesProskauer reaction) are not produced. Decomposes casein, gelatin, Tweens 20, 40 and 80 and starch. Does not hydrolyse DNA, urea, cellulose (CM-cellulose and filter paper) or chitin. Forms acid from D-galactose and glycerol, but not from L-arabinose, D-cellobiose, L-fucose, D-glucose, D-lactose, D-maltose, D-melibiose, L-raffinose, L-rhamnose, L-sorbose, D-sucrose, D-trehalose, DL-xylose, N-acetylglucosamine, citrate, acetate, fumarate, malate, adonitol, dulcitol, inositol or mannitol. Utilizes L-arabinose, D-glucose, D-lactose, D-mannose and D-sucrose, but not inositol, sorbitol, mannitol, malonate or citrate. Susceptible to benzylpenicillin, carbenicillin, lincomycin, doxycycline, erythromycin and chloramphenicol. The G+C content of the DNA is 38 mol%.
The type strain is LMG 1345T (=ATCC 19326T). Isolated from sea water collected in the North Sea off Aberdeen, Scotland, UK.
Description of Leeuwenhoekiella aequorea sp. nov.
Leeuwenhoekiella aequorea (ae.quo.re'a. L. fem. adj. aequorea of the sea, marine).
The main characteristics are as given for the genus. In addition, cells range from 0·5 to 0·6 µm in width and from 1·6 to 2·3 µm in length. On marine agar 2216, colonies are 24 mm in diameter, circular with entire edges and bright yellow in colour. Growth is observed at 437 °C. Optimal temperature for growth is 2325 °C. Growth occurs at 015 % NaCl, with optimal growth at 05 % NaCl. Nitrate is not reduced. Indole, H2S and acetoin (VogesProskauer reaction) are not produced. Decomposes casein, gelatin, starch and Tweens 20, 40 and 80. Does not hydrolyse agar, DNA, urea, cellulose (CM-cellulose and filter paper) or chitin. Forms acid from D-galactose, D-sucrose, glycerol and mannitol, but not from L-arabinose, D-cellobiose, L-fucose, D-glucose, D-lactose, D-maltose, D-melibiose, L-raffinose, L-rhamnose, L-sorbose, DL-xylose, N-acetylglucosamine, acetate, citrate, fumarate, malate, adonitol, dulcitol or inositol. Can oxidize D-trehalose. Utilizes L-arabinose, D-glucose, D-lactose, D-mannose, D-sucrose and mannitol, but not inositol, sorbitol, malonate or citrate. The G+C content of the DNA is 3536 mol%.
The type strain is LMG 22550T (=CCUG 50091T), which was isolated from Antarctic sea water. Strain LMG 22555 was isolated from the sea urchin Strongylocentrotus intermedius found in the Sea of Japan.
| ACKNOWLEDGEMENTS |
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