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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 Korean Collection for Type Cultures, Biological Resource Center, Korea Institute of Bioscience and Biotechnology, 52 Oun Dong, Yusong, Daejon 305-333, Republic of Korea
Correspondence
Olga I. Nedashkovskaya
olganedashkovska{at}piboc.dvo.ru
or
olganedashkovska{at}yahoo.com
| ABSTRACT |
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The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of Gillisia mitskevichiae KMM 6034T is AY576655.
Present address: Department of Microbiology, School of Bioscience and Biotechnology, Chungnam National University, Yusong, Daejon 305-764, Republic of Korea. ![]()
| MAIN TEXT |
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During June 2000, we isolated an unknown bacterium from a sea-water sample collected in Amursky Bay, Gulf of Peter the Great, Sea of Japan. A polyphasic taxonomic study of strain KMM 6034T, cultured on marine agar 2216 at 25 °C for 48 h, indicates that the isolate represents a novel species of the genus Gillisia, for which the name Gillisia mitskevichiae sp. nov. is proposed.
Genomic DNA extraction, PCR and sequencing of the 16S rRNA gene followed previous procedures (Kim et al., 1998
). The sequence data obtained were aligned with those of members of the family Flavobacteriaceae using PHYDIT version 3.2 (http://plaza.snu.ac.kr/
jchun/phydit/). Phylogenetic trees were inferred by using suitable programs of the PHYLIP package (Felsenstein, 1993
). Phylogenetic distances were calculated from the model of Kimura (1980)
and trees were constructed on the basis of the neighbour-joining (Saitou & Nei, 1987
) and maximum-likelihood (Felsenstein, 1993
) algorithms. Bootstrap analysis was performed with 1000 resampled datasets by using SEQBOOT and CONSENSE programs of the PHYLIP package.
Phylogenetic analysis of the almost-complete 16S rRNA gene sequence (1430 nucleotide positions) revealed that strain KMM 6034T was a member of the family Flavobacteriaceae and formed a distinct lineage within the genus Gillisia (Fig. 1
). The level of 16S rRNA gene sequence similarity between strains KMM 6034T and G. limnaea LMG 21470T was 96·7 %. 16S rRNA gene sequence similarity values of the strain studied with the next closest relatives Mesonia algae KMM 3909T, [Cytophaga] latercula ATCC 23177T, Salegentibacter salegens DSM 5424T, Psychroflexus torquis ACAM 623T and Kordia algicida OT-1T were 91·4, 92·2, 93·1, 91·4 and 90·5 %, respectively.
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Analysis of fatty acid methyl esters was carried out according to the standard protocol of the Microbial Identification System (Microbial ID). The cellular fatty acids comprising more than 1 % for strain KMM 6034T were straight- and branched-chain unsaturated and saturated fatty acids, namely i-14 : 0 (1·2 %), i-15 : 1 (11·8 %), a-15 : 1 (2·4 %), i-15 : 0 (7·5 %), a-15 : 0 (5·1 %), 15 : 0 (4·4 %), 15 : 1
6c (1·9 %), i-16 : 1 (6 %), i-16 : 0 (9·3 %), i-15 : 0 3-OH (1·1 %), 15 : 0 2-OH (2·4 %), i-17 : 1
9c (4 %), a-17 : 1
9c (2·1 %), 17 : 1
6c (4·7 %), i-16 : 0 3-OH (7·2 %), 16 : 0 3-OH (1·2 %), i-17 : 0 3-OH (6·7 %), 17 : 0 2-OH (3·8 %), and summed feature 3 (11·1 %), comprising i-15 : 0 2-OH and/or 16 : 1
7c, which corresponds to the fatty acid composition of G. limnaea (Van Trappen et al., 2004
). Both the strain studied and G. limnaea strains contained similar amounts of branched fatty acids (>65 % of total).
Phenotypic analysis was performed by using previously described methods (Nedashkovskaya et al., 2003a
, b
). Gliding motility was determined as described by Bowman (2000)
.
The physiological, morphological and biochemical characteristics of strain KMM 6034T are listed in the species description and Table 1
. The similarities in phenotypic characteristics support the inclusion of the strain studied in the genus Gillisia. However, strain KMM 6034T clearly differed from strains of G. limnaea by the NaCl requirement for growth, growth at 12 % NaCl, maximum growth temperature (31 °C), acid production from carbohydrates, utilization of mannitol and the ability to degrade casein, urea, DNA and Tweens 20 and 40 (Table 1
).
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Description of Gillisia mitskevichiae sp. nov.
Gillisia mitskevichiae (mit.ske'vi.chi.ae. N.L. gen. n. mitskevichiae of Mitskevich, in honour of Irina N. Mitskevich, Russian marine microbiologist, for her contributions to the development of marine microbiology).
Cells are Gram-negative, strictly aerobic with respiratory metabolism, chemo-organotrophic, asporogenic rods, non-motile by gliding, 0·50·7 µm wide and 34 µm long. Oxidase-, catalase-, urease- and alkaline phosphatase-positive. Colonies are circular, convex, shiny with entire edges, 13 mm in diameter on marine agar 2216. Produces yellow non-diffusible pigments. No growth is observed without Na+; grows at 112 % NaCl. Flexirubin pigments are absent. Growth occurs at 431 °C. The pH range of growth is 5·510·0, with optimum growth occurring between pH 7·6 and 8·3. Casein, gelatin, DNA, urea and Tweens 40 and 80 are degraded; does not hydrolyse agar, starch, cellulose (CM-cellulose and filter paper), chitin or Tween 20. Forms acid from glucose, sucrose and N-acetylglucosamine, but not from arabinose, cellobiose, fucose, galactose, lactose, maltose, melibiose, raffinose, rhamnose, xylose, adonitol, dulcitol, glycerol, inositol or mannitol. Does not utilize arabinose, lactose, mannose, inositol, mannitol, sorbitol or citrate as sole sources of carbon and energy. Nitrate reduction is negative. H2S, indole and acetoin (VogesProskauer reaction) are not produced. Susceptible to ampicillin, carbenicillin, oleandomycin, lincomycin, streptomycin and tetracycline; resistant to kanamycin, benzylpenicillin, neomycin, gentamicin and polymyxin B. The predominant cellular fatty acids are straight-chain unsaturated, branched-chain unsaturated and saturated, namely i-15 : 0 (7·5 %), a-15 : 0 (5·1 %), i-15 : 1 (11·8 %), i-16 : 1 (6 %), i-16 : 0 (9·3 %), i-16 : 0 3-OH (7·2 %), i-17 : 0 3-OH (6·7 %) and summed feature 3 (11·1 %), consisting of i-15 : 0 2-OH and/or 16 : 1
7c (64·7 % of total). The G+C content of the DNA is 36·4 mol%.
The type strain is KMM 6034T (=KCTC 12261T=NBRC 100590T=LMG 22575T), isolated from sea-water collected in Amursky Bay, Gulf of Peter the Great, Sea of Japan.
| ACKNOWLEDGEMENTS |
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