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Department of Science Education, Cheju National University, Jeju 690-756, Republic of Korea
Correspondence
Soon Dong Lee
sdlee{at}cheju.ac.kr
| ABSTRACT |
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| MAIN TEXT |
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The genus contained, at the time of writing, 15 recognized species, mainly recovered from dairy products, clinical specimens, poultry and terrestrial environments, although a few, including Brevibacterium celere (Ivanova et al., 2004
) and Brevibacterium stationis (Jones & Keddie, 1986
), were recovered from samples collected in marine environments. In the 16S rRNA gene sequence studies performed by Heyrman et al. (2004)
, B. stationis was shown to be related to members of the genus Corynebacterium. In the present study, a novel member of the genus Brevibacterium, recovered from beach sediment, was characterized taxonomically by use of a polyphasic approach. The resultant data supported that the organism should be classified as a novel species of the genus Brevibacterium.
During a study of marine actinomycetes, strain SST-8T was isolated from beach sediment of the coast of Jeju Island, Republic of Korea, and its taxonomic status was investigated. A sediment sample was taken at a depth of 30 cm below the beach surface. For bacterial isolation, 1 g sediment was placed into a sterile plastic tube containing 9 ml sterile distilled water and mixed in a tube rotator for 30 min. After aliquots (100 µl) of the sample were transferred into the isolation medium, the agar plates were incubated at 30 °C for 14 days. The isolation medium (SC-SW agar) consisted of 1 % soluble starch, 0.03 % casein, 0.2 % KNO3, 0.2 % NaCl, 0.002 % CaCO3, 0.005 % MgSO4.7H2O, 0.001 % FeSO4.7H2O, 1.8 % agar, 60 % natural seawater and 40 % distilled water (pH 7.2). Colonies were subcultivated on ISP2 medium (Shirling & Gottlieb, 1966
) supplemented with 60 % (v/v) sterilized natural seawater (YE-SW agar). Pure cultures were maintained on YE-SW agar plates and in 20 % (v/v) glycerol solution supplemented with 60 % (v/v) sterilized natural seawater at 20 and 80 °C.
Analysis of cellular fatty acids was performed according to the instructions of the Microbial Identification System (MIDI) (Sherlock Microbial Identification System; Hewlett Packard), with cells grown on trypticase soy agar for 48 h. Other chemotaxonomic characters were analysed as described by Lee et al. (2000b)
as follows: the isomer of diaminopimelic acid (Staneck & Roberts, 1974
), mycolic acids (Minnikin et al., 1980
), polar lipids (Minnikin et al., 1977
) and lipoquinones (Kroppenstedt, 1985
). The fatty acid profile of strain SST-8T was characterized by the predominance of anteiso-C17 : 0 (35.3 %), anteiso-C15 : 0 (29.9 %) and iso-C15 : 0 (15.5 %), which is consistent with profiles for members of the genus Brevibacterium (Funke & Carlotti, 1994
). Other fatty acids present at levels above 1 % were iso-C17 : 0 (4.2 %), C16 : 0 (4.2 %), C18 : 0 (4.0 %), iso-C16 : 0 (2.5 %) and C18 : 1 (1.9 %). Whole-cell hydrolysates contained meso-diaminopimelic acid; mycolic acids were not present and the predominant menaquinone was MK-8(H2). All of these features are consistent with the chemotaxonomic description of the genus Brevibacterium (Collins et al., 1983
). The polar lipid profiles contained significant amounts of phosphatidylglycerol, but not diphosphatidylglycerol or phosphatidylinositol found in other members of the genus (Jones & Keddie, 1986
).
Purification of chromosomal DNA was carried out by using the Wizard genomic DNA purification kit (Promega) according to the manufacturer's instructions. The 16S rRNA gene of strain SST-8T was amplified by PCR as described by Lee et al. (2000a)
and was subjected to direct sequence determination using an ABI PRISM BigDye Terminator cycle sequencing kit (Applied Biosystems) and an automatic DNA sequencer (model 3730xl; Applied Biosystems). The almost-complete 16S rRNA gene sequence of strain SST-8T was determined (1426 nt), and the results of an initial BLAST search against GenBank sequence data indicated that the organism was related to the genus Brevibacterium of the family Brevibacteriaceae. Multiple alignment of the sequences was performed by using the CLUSTAL X program (Thompson et al., 1997
) and then manually optimized following the secondary structure of the bacterial 16S rRNA gene. Phylogenetic analyses were performed using three tree-making algorithms, namely the neighbour-joining (Saitou & Nei, 1987
), maximum-likelihood (Felsenstein, 1981
) and maximum-parsimony (Fitch, 1971
) methods. A phylogenetic tree was reconstructed based on the neighbour-joining method from evolutionary distances calculated according to the method of Jukes & Cantor (1969)
. Confidence in the tree topology was evaluated by bootstrap analysis (Felsenstein, 1985
) of 1000 replicated datasets. The neighbour-joining tree (Fig. 1
) showed that strain SST-8T formed an intermediate branch between the Brevibacterium luteolum/Brevibacterium otitidis and Brevibacterium mcbrellneri/Brevibacterium paucivorans clusters with 73 % bootstrap support. This relationship was supported by all tree-making methods used in this study. Sequence similarity calculations after a neighbour-joining analysis revealed that the closet relatives of strain SST-8T were the type strains of B. paucivorans (96.6 %), B. luteolum (96.5 %), B. mcbrellneri (96.3 %), Brevibacterium avium (96.0 %) and B. otitidis (95.9 %). Levels of 16S rRNA gene sequence similarity between strain SST-8T and the other recognized Brevibacterium species were in the range 95.095.5 %. The results of these 16S rRNA gene sequence comparisons indicate that the isolate can be assigned to a separate genospecies without the need for further DNADNA hybridization experiments (Stackebrandt & Goebel, 1994
). The DNA G+C content determined for strain SST-8T was 70.7 mol%.
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Phenotypic features that can be used to differentiate between the new isolate and its phylogenetic neighbours within the genus Brevibacterium are given in Table 1
. The combination of phenotypic and genotypic data supports that strain SST-8T be classified as the type strain of a novel species of the genus Brevibacterium, Brevibacterium samyangense sp. nov.
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Cells are Gram-positive, catalase-positive, oxidase-negative, motile and non-spore-forming. On YE-SW agar, an apparent rodcoccus growth cycle is observed: after 6 h growth, cells are coccoid, occurring singly or in pairs, with the rare occurrence of short rods; after 12 and 16 h growth, most cells are irregular and slender rods, arranged in V-forms; after 24 and 72 h growth, cells are coccoid, occurring singly, in pairs or in chains. Colonies are opaque, convex, circular and bright yellow in colour with an entire edge. Temperature range for growth is 1045 °C. No growth is observed at 4 or 55 °C. Growth occurs in the pH range 6.110.1, with better growth at higher pH. NaCl tolerance for growth is observed, with good growth at 05 %, moderate growth at 69 % but only weak growth at 10 or 15 % NaCl. Degradation of DL-tyrosine is observed but not of casein or xanthine. The following substrates are utilized as sole carbon and energy sources for growth in Biolog GP2 tests:
-cyclodextrin, dextrin, glycogen, inulin, mannan, Tweens 40 and 80, N-acetyl-D-glucosamine, N-acetyl-
-D-mannosamine, amygdalin, L-arabinose, D-arabitol, arbutin, D-cellobiose, D-fructose, L-fucose, D-galactose, D-galacturonic acid,
-D-glucose, myo-inositol,
-D-lactose, lactulose, maltose, maltotriose, D-mannitol, D-mannose, D-melezitose, D-melibiose, methyl
-D-galactoside, methyl
-D-galactoside, 3-methyl D-glucoside, methyl
-D-glucoside, methyl
-D-glucoside, methyl
-D-mannoside, palatinose, D-psicose, D-raffinose, L-rhamnose, D-ribose, salicin, sedoheptulosan, D-sorbitol, stachyose, sucrose, D-tagatose, D-trehalose, turanose, xylitol, D-xylose, acetic acid,
-,
- and
-hydroxybutyric acids, p-hydroxyphenylacetic acid,
-ketoglutaric acid,
-ketovaleric acid, lactamide, D-lactic acid methyl ester, L-lactic acid, L-malic acid, methylpyruvate, monomethylsuccinate, propionic acid, succinamic acid, succinic acid, N-acetyl-L-glutamic acid, L-alaninamide, D- and L-alanine, L-alanylglycine, L-asparagine, L-glutamic acid, glycyl L-glutamic acid, L-pyroglutamic acid, L-serine, putrescine, adenosine, 2'-deoxyadenosine, inosine, thymidine, uridine, adenosine 5'-monophosphate, thymidine 5'-monophosphate, uridine 5'-monophosphate,
-D-glucose 1-phosphate, D-glucose 6-phosphate and DL-
-glycerol phosphate. The following substrates in the Biolog GP2 system are not utilized:
-cyclodextrin, gentiobiose, D-gluconic acid, D-malic acid, 2,3-butanediol, glycerol and D-fructose 6-phosphate. In the API CORYNE system, pyrazinamidase, pyrrolidonyl arylamidase, alkaline phosphatase,
-galactosidase and
-glucosidase are positive. Nitrate reduction,
-glucuronidase, N-acetyl-
-glucosaminidase,
-glucosidase (aesculin hydrolysis), urease, gelatin hydrolysis and fermentation of D-ribose, D-xylose, D-mannitol, D-lactose and glycogen are negative. Acid production from D-glucose, D-maltose and sucrose are weakly positive. In additional tests with the API ZYM system, esterase (C4), esterase lipase (C8), leucine arylamidase, trypsin and naphthol-AS-BI-phosphohydrolase are positive. Valine arylamidase and cystine arylamidase are weakly positive. The following give negative responses: lipase (C14),
-chymotrypsin, acid phosphatase,
-galactosidase,
-glucuronidase,
-glucosidase, N-acetyl-
-glucosaminidase,
-mannosidase and
-fucosidase. The phospholipid profiles contain diphosphatidylglycerol. Mycolic acids are not present. The major cellular fatty acids are anteiso-C17 : 0, anteiso-C15 : 0 and iso-C15 : 0. The G+C content of the DNA is 70.7 mol%.
The type strain, SST-8T (=NRRL B-41420T=KCCM 42316T), was isolated from sand sediment of Samyang Beach, Jeju Island, Republic of Korea.
| ACKNOWLEDGEMENTS |
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