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1 Department of Microbiology, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok 10330, Thailand
2 Faculty of Science & Technology, Suan Sunandha Rajabhat University, Bangkok 10300, Thailand
3 Japan Collection of Microorganisms, RIKEN BioResource Center, Wako-shi, Saitama 351-0198, Japan
Correspondence
Somboon Tanasupawat
Somboon.T{at}chula.ac.th
| ABSTRACT |
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The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of RBU1-1T is AB194046.
A chromatogram of the polar lipids of strain RBU1-1T is available as a supplementary figure with the online version of this paper.
| MAIN TEXT |
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Strain RBU1-1T was isolated from fermented fish (pla-ra) collected from a market in Ratchaburi Province, Thailand. Isolation was by the spread-plate technique on agar plates of JCM medium no. 377 (designated Lentibacillus medium; Namwong et al., 2005
) incubated at 37 °C for 7 days. Strain RBU1-1T and reference strain Filobacillus milosensis JCM 12288T were routinely cultivated in JCM medium no. 377.
Cell form, cell size, cell arrangement and colonial appearance were examined for cells grown on Lentibacillus medium at 37 °C for 5 days. The Gram reaction was investigated according to the procedures of Hucker & Conn (1923)
. Critical-point-dried cells and spores were observed under a scanning electron microscope. Flagella were stained by the method described by Forbes (1981)
. Tests for catalase, oxidase, indole production, Simmons' citrate, nitrate reduction and hydrolysis of DNA, starch, tyrosine, Tween 80, phenylalanine, xanthine and hypoxanthine were performed according to the methods of Barrow & Feltham (1993)
. The test for arginine hydrolysis was performed by using the medium given by Thornley (1960)
. Casamino acids in JCM medium no. 377 were omitted from the test medium for determination of the hydrolysis of gelatin and casein. Urease was detected on Christensen's medium (Barrow & Feltham, 1993
) supplemented with 10 % NaCl. Acid production from carbohydrate was determined in the medium described by Leifson (1963)
supplemented with 6.5 % NaCl. Growth under anaerobic conditions on agar plates was performed by using a Gaspak (BBL). Growth at various temperatures (560 °C) was examined by using a temperature gradient incubator (model TN-3; Advantec). NaCl requirement for growth was determined in the medium containing various NaCl concentrations (030 %). At lower NaCl concentrations (02.0 %), MgSO4.7H2O was omitted from the test medium and KCl and trisodium citrate were used. Growth was monitored by measuring culture turbidity at 660 nm. Isomers of diaminopimelic acid (DAP) in the peptidoglycan and menaquinones were analysed as described by Komagata & Suzuki (1987)
. Polar lipids were determined according to the method of Minnikin et al. (1984)
. Quantitative analysis of cellular fatty acids was done with the Microbial Identification System (MIDI) (Sasser, 1990
; Kämpfer & Kroppenstedt, 1996
). DNA was isolated from cells grown in JCM no. 377 medium broth incubated on a rotary shaker (150 r.p.m.) at 37 °C for 2 days and was purified according to the method of Saito & Miura (1963)
. The DNA G+C content was determined by the method of Tamaoka & Komagata (1984)
by using reversed-phase HPLC. DNADNA hybridization experiments were conducted as described by Ezaki et al. (1989)
and with the colorimetric method as reported by Tanasupawat et al. (2000)
. 16S rRNA gene fragments were amplified by PCR and the sequence was determined as described by Tanasupawat et al. (2004)
. The 16S rRNA gene sequence was multiply aligned with the program CLUSTAL_X (Thompson et al., 1997
); the alignment was manually verified and edited prior to construction of a phylogenetic tree. The phylogenetic tree was constructed by using the neighbour-joining method (Saitou & Nei, 1987
) in the program MEGA, version 2.1 (Kumar et al., 2001
). Confidence values of branches of the phylogenetic tree were determined by using bootstrap analyses (Felsenstein, 1985
) based on 1000 resampled datasets.
Cells of strain RBU1-1T were Gram-positive rods, 0.40.5x1.54 µm in size, and motile with peritrichous flagella. Oval to spherical endospores were formed at cell-terminal positions in swollen sporangia (Fig. 1
). Colonies were white to cream, 0.93.9 mm in diameter after 5 days cultivation on Lentibacillus agar medium. Results of physiological, biochemical and chemotaxonomic tests are given in the species description below and in Table 1
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Strain RBU1-1T can be separated from the genera Filobacillus, Tenuibacillus and Alkalibacillus and is considered to represent a novel species of a new genus. We propose the name Piscibacillus salipiscarius gen. nov., sp. nov. to accommodate this organism.
Description of Piscibacillus gen. nov.
Piscibacillus (Pis.ci.ba.cil'lus. L. n. piscis fish; L. masc. n. bacillus small rod; N.L. masc. n. Piscibacillus a rod from fish).
Gram-positive rods, measuring 0.40.5x1.54 µm. Cells are motile with peritrichous flagella. Oval terminal endospores are formed in swollen sporangia. Positive for catalase and oxidase, but negative for urease and reduction of nitrate, production of indole and utilization of citrate. Casein, DNA and gelatin are hydrolysed, but arginine, starch, Tween 80, tyrosine, phenylalanine, xanthine and hypoxanthine are not. meso-DAP is present in the peptidoglycan. The predominant menaquinone is MK-7. The major fatty acids are iso-C15 : 0 and anteiso-C15 : 0 (Table 2
). Phosphatidylglycerol and diphosphatidylglycerol are the predominant polar lipids (see Supplementary Fig. S1 in IJSEM Online). The type species is Piscibacillus salipiscarius.
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Colonies are white to cream, 0.93.9 mm in diameter after 5 days growth on Lentibacillus agar medium. Grows aerobically but weakly under anaerobic conditions. Grows at 1548 °C (optimally at 37 °C), pH 59 (optimally at pH 7.0) and in 230 % NaCl (optimally in 1020 %). Acid is produced from D-fructose, D-galactose, D-glucose, glycerol, D-ribose and sucrose, but not from D-amygdalin, L-arabinose, cellobiose, inulin, lactose, maltose, mannitol, D-mannose, melibiose, melezitose, methyl
-D-glucoside, myo-inositol, raffinose, rhamnose, salicin, sorbitol, trehalose or D-xylose. The DNA G+C content of the type strain is 36.7 mol%.
The type strain, RBU1-1T (=JCM 13188T=PCU 270T=TISTR 1571T), was isolated from fermented fish (pla-ra) in Thailand.
| ACKNOWLEDGEMENTS |
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