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1 Korean Agricultural Culture Collection (KACC), Microbial Genetics Division, National Institute of Agricultural Biotechnology, Rural Development Administration (RDA), Suwon 441-707, Republic of Korea
2 Applied Microbiology Division, National Institute of Agricultural Science and Technology, RDA, Suwon 441-707, Republic of Korea
Correspondence
Byung-Yong Kim
kimby{at}rda.go.kr
| ABSTRACT |
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9c. The DNA G+C content of strain HO3-R19T was 65.0 mol%. Based on physiological, biochemical and chemotaxonomic traits together with results of comparative 16S rRNA sequence analysis, strain HO3-R19T is considered to represent a novel species in a new genus, for which the name Arenimonas donghaensis gen. nov., sp. nov. is proposed. The type strain of Arenimonas donghaensis is HO3-R19T (=KACC 11381T=DSM 18148T).
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Strain HO3-R19T was isolated via a dilution plating method onto R2A agar (Difco) after 7 days incubation at 28 °C. The resulting colonies were purified by transferring them onto new plates and subjecting them to an additional incubation for 3 days at 28 °C. Purified colonies were tentatively identified from partial 16S rRNA gene sequences.
Colony properties were also observed on R2A medium. Cell morphology was observed via light microscopy (AXIO; Zeiss) and transmission electron microscopy (model 912AB; LEO) (Fig. 1
). Flagellum type was also determined by transmission electron microscopy. Gram staining of strain HO3-R19T was determined by using a Gram stain kit (Difco) according to the manufacturer's instructions. Phenotypic tests were performed by using standard procedures (Smibert & Krieg, 1994
). Hydrolysis of carboxymethylcellulose (0.1 %, w/v), casein (5.0 %, w/v), starch (1.0 %, w/v), gelatin (0.4 %, w/v) and tyrosine (0.5 %, w/v) was tested as described by Lanyi (1987)
. Growth at different salinities was tested at 0, 2, 3, 5, 7 and 10 % NaCl (w/v) on R2A broth after cultivation for 7 days. Temperature range for growth was assessed at 4, 10, 15, 20, 25, 30, 35, 40, 45 and 50 °C on R2A agar after 15 days incubation. For pH tests, R2A broth adjusted to initial pH values of 4, 5, 6, 7, 8, 9 and 10 with citrate/phosphate buffer or Tris/hydrochloride buffer (Breznak & Costilow, 1994
) was used to examine the ability of the strain to grow at different pH for 15 days. For the nitrate and nitrite reduction tests, the isolate was inoculated into three serum bottles (25 ml) containing 13 ml R2A broth, while nitrate and nitrite were added as KNO3 and NaNO2 at concentrations of 10 mM. The reduction of nitrate and nitrite was monitored via an ion chromatograph (model IC-320; Dionex) equipped with a conductivity detector and anion exchange column (Metrosep Anion Supp 4; Metrohm).
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The following chemotaxonomic characteristics were analysed: isoprenoid quinone (as described by Groth et al., 1996
), fatty acids (according to the standard protocol of the MIDI/Hewlett Packard Microbial Identification System; Sasser, 1990
) and G+C content of the DNA (Mesbah et al., 1989
).
The 16S rRNA gene sequence of strain HO3-R19T was analysed as described by Kwon et al. (2003)
. Phylogenetic analysis was performed by using the program MEGA, version 3.1 (Kumar et al., 2004
), after multiple alignment of the data by using CLUSTAL W (Thompson et al., 1994
). Distances were obtained by using options according to the Kimura two-parameter model (Kimura, 1980
) and clustering was performed by using the neighbour-joining (Saitou & Nei, 1987
) and maximum-parsimony (Fitch, 1971
) methods. Bootstrap values from 1000 replications were used to obtain the confidence level of the branches (Felsenstein, 1985
).
Comparative analysis of the 16S rRNA gene sequence with those of the type species of related genera indicated that strain HO3-R19T was a member of the family Xanthomonadaceae and had a unique taxonomic position within the class Gammaproteobacteria. The tree constructed based on the neighbour-joining method indicated that strain HO3-R19T formed a phyletic line that was distinct from those occupied by the type species of the closely related genera Pseudoxanthomonas, Thermomonas, Silanimonas, Lysobacter, Luteimonas, Stenotrophomonas, Xylella and Xanthomonas (Fig. 2
). The topology of the phylogenetic tree based on the maximum-parsimony algorithm was similar to that of the tree constructed by using neighbour-joining analysis (data not shown). According to a BLAST search within the NCBI database, strain HO3-R19T showed highest 16S rRNA gene sequence similarity to Pseudoxanthomonas suwonensis 4M1T (93.5 %). Strain HO3-R19T was also closely related to Pseudoxanthomonas broegbernensis DSM 12573T and Silanimonas lenta 25-4T, but with only 93.0 and 92.6 % 16S rRNA gene sequence similarity, respectively.
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The major respiratory lipoquinone of strain HO3-R19T was ubiquinone 8 (Q-8), as with closely related taxa. After incubation for 3 days at 28 °C on R2A, the cellular fatty acids of strain HO3-R19T included iso-C16 : 0 (31.0 %), iso-C15 : 0 (26.9 %), iso-C17 : 1
9c (14.7 %), iso-C14 : 0 (6.4 %), iso-C11 : 0 3-OH (5.5 %), iso-C15 : 1 F (2.9 %), summed feature 3 (iso-C15 : 0 2-OH and/or C16 : 1
9c; 2.7 %), iso-C11 : 0 (2.2 %), summed feature 1 (C13 : 0 3-OH and/or iso-C15 : 1 H; 1.8 %), iso-C16 : 1 H (1.2 %) and iso-C17 : 0 (1.1 %). The iso-branched fatty acids iso-C16 : 0, iso-C15 : 0 and iso-C17 : 1
9c as major components are also characteristic of T. haemolytica, Silanimonas lenta and Aquimonas voraii but not of some other related genera. The predominant hydroxy fatty acid of strain HO3-R19T was iso-C11 : 0 3-OH, as is also the case for Silanimonas lenta, T. haemolytica, Luteimonas mephitis, Lysobacter enzymogenes and A. voraii. By contrast, some related taxa (P. broegbernensis, Stenotrophomonas maltophilia, Xylella fastidiosa and Xanthomonas campestris) contained hydroxy fatty acids that were not detected in strain HO3-R19T (Table 1
).
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In conclusion, the 16S rRNA gene sequence, physiological characteristics, fatty acid profile and DNA G+C content of strain HO3-R19T were quite different from those of its phylogenetic neighbours. In addition, the closest similarity (93.5 %) of the 16S rRNA gene sequence of strain HO3-R19T with a recognized bacterium (the type strain of P. suwonensis) was much lower than the threshold level that is generally used to define a new genus (Ludwig et al., 1998
). Therefore, we propose that isolate HO3-R19T should be classified as representing a novel species in a new genus, Arenimonas donghaensis gen. nov., sp. nov., within the family Xanthomonadaceae, class Gammaproteobacteria.
Description of Arenimonas gen. nov.
Arenimonas (A.re'ni.mo.nas. L. fem. n. arena sand; L. fem. n. monas a unit, monad; N.L. fem. n. Arenimonas a sand monad, referring to a bacterium isolated from sand).
Cells are aerobic, Gram-negative, non-spore-forming rods. Oxidase- and catalase-positive. Nitrate and nitrite are not reduced. Major isoprenoid quinone is Q-8. Predominant cellular fatty acids are iso-branched, such as iso-C16 : 0, iso-C15 : 0 and iso-C17 : 1
9c. Phylogenetically, the genus belongs to the family Xanthomonadaceae within the class Gammaproteobacteria. The type species is Arenimonas donghaensis.
Description of Arenimonas donghaensis sp. nov.
Arenimonas donghaensis (dong.ha.en'sis. N.L. fem. adj. donghaensis pertaining to Donghae, the Korean name of the East Sea of Korea, where the type strain was isolated).
Cells are straight or slightly curved rods that are 0.40.6 µm wide and 1.33.0 µm long. Colonies are yellowish white, translucent and convex on R2A agar after 3 days cultivation. Motile by means of a single polar flagellum. The pH range for growth is 7.09.0, with an optimum at pH 8.0. The temperature range for growth is 437 °C, with an optimum at 28 °C. Growth occurs at NaCl concentrations of 03 % (w/v) (optimum of 12 %). Does not grow under anaerobic conditions. Positive for hydrolysis of casein, tyrosine, DNA and gelatin. Negative for indole production, VogesProskauer test, phenylalanine deamination and hydrolysis of starch, urea and cellulose. In API 20NE tests, cells are positive only for hydrolysis of gelatin, and negative for nitrate reduction, indole production, glucose fermentation, arginine dihydrolase, urease, aesculin hydrolysis,
-galactosidase and assimilation of D-glucose, L-arabinose, D-mannose, D-mannitol, N-acetylglucosamine, D-maltose, potassium gluconate, capric acid, adipic acid, malic acid, trisodium citrate and phenylacetic acid. In API ZYM tests, cells are positive for alkaline phosphatase, esterase (C4), esterase lipase (C8), trypsin,
-chymotrypsin, acid phosphatase and naphthol-AS-BI-phosphohydrolase, but negative for lipase (C14), leucine arylamidase, valine arylamidase, cystine arylamidase,
-galactosidase,
-galactosidase,
-glucuronidase,
-glucosidase,
-glucosidase, N-acetylglucosaminidase,
-mannosidase and
-fucosidase. Predominant polar lipids are diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, a small amount of an unknown phospholipid and two unknown aminophospholipids. Major fatty acids are iso-C16 : 0, iso-C15 : 0 and iso-C17 : 1
9c when grown on R2A for 3 days. The DNA G+C content is 65.0 mol% (HPLC).
The type strain, HO3-R19T (=KACC 11381T=DSM 18148T), was isolated from seashore sand in Pohang, Korea.
| ACKNOWLEDGEMENTS |
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