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1 College of Agriculture and Natural Resources, Department of Soil and Environmental Sciences, National Chung Hsing University, Taichung 402, Taiwan, Republic of China
2 Institut für Angewandte Mikrobiologie, Justus-Liebig Universität Giessen, Heinrich-Buff-Ring 2632 (IFZ), D-35392 Giessen, Germany
Correspondence
Peter Kämpfer
peter.kaempfer{at}agrar.uni-giessen.de
| ABSTRACT |
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The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain CC-TWGS1-8T is AJ843132.
| MAIN TEXT |
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A yellow-pigmented isolate from a tar-contaminated soil from Taichung, Taiwan, was obtained on nutrient agar. This strain (CC-TWGS1-8T) was maintained and subcultured on nutrient agar (Oxoid) at 30 °C for 48 h and subsequently analysed to determine the 16S rRNA gene sequence, the fatty acid methyl ester composition of whole-cell hydrolysates, additional phenotypic characteristics, and DNADNA relatedness to those species most closely related on the basis of 16S rRNA similarity.
Cultural and morphological characteristics were observed on nutrient agar. The Gram reaction was tested by using the modified method of Gerhardt et al. (1994)
, while motility was examined microscopically from cells grown for 3 days in motility broth (Cowan, 1974
) at 30 °C.
Strain CC-TWGS1-8T was Gram-negative and formed visible (about 2 mm) yellowish colonies in 48 h at 30 °C. No growth was observed below 10 °C or above 37 °C. At 1536 °C, clearly visible colonies appeared within 48 h. The colonies were translucent and shiny with entire edges, but upon prolonged incubation the colonies were not visible as single entities, probably because of the profuse production of extracellular substances. A bright-yellow pigment (flexirubin) was produced on nutrient agar. Oxidase activity was tested using oxidase reagent (bioMérieux) according to the instructions of the manufacturer. Strain CC-TWGS1-8T was oxidase-positive. Cells were non-motile, non-spore-forming rods (1 µm wide by 2 µm long). CC-TWGS1-8T was able to grow well on nutrient agar, brain heart infusion agar (Oxoid) and trypticase soy agar (Oxoid) but was unable to grow on MacConkey agar (Oxoid).
Physiological characterization and additional biochemical tests were performed to assess the carbon-source utilization pattern, while the hydrolysis of 19 substrates was investigated as described by Kämpfer et al. (1991)
. Additional biochemical tests were performed using the Micronaut-E system (formerly called the Titertek-Enterobac-Automated System; Kämpfer, 1990
). Growth was also investigated at different temperatures (4, 11, 30, 37 and 45 °C) in nutrient broth. The API ZYM system (bioMérieux) was used to test for the presence of 19 constitutive enzymes.
The cellular fatty acid composition (determined using the method described by Kämpfer & Kroppenstedt, 1996
) showed that 15 : 0 iso was the most abundant fatty acid (35·4 %), followed by 17 : 0 iso 3OH (22·5 %) and summed feature 4 (15 : 0 iso 2OH/16 : 1
7t, 13·8 %). Table 1
shows the fatty acid pattern for strain CC-TWGS1-8T in comparison with those of all other Chryseobacterium species.
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Strain CC-TWGS1-8T utilized only a few carbon sources but was able to hydrolyse many chromogenic substrates. The results of biochemical/physiological tests are given in Table 2
and in the species description.
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Description of Chryseobacterium taichungense sp. nov.
Chryseobacterium taichungense (tai.chung'en.se. N.L. neut. adj. taichungense pertaining to Taichung, a province in Taiwan).
Cells are Gram-negative, non-motile, non-spore-forming rods (approx. 2 µm in length). Aerobic, oxidase-positive, shows good growth after 48 h on nutrient agar, brain heart infusion agar and trypticase soy agar at 1136 °C, but unable to grow on MacConkey agar. Colonies on nutrient agar are smooth, yellowish, circular, translucent and shiny with entire edges, becoming mucoid and unidentifiable as single entities after prolonged incubation. The yellow pigmentation is non-diffusible and non-fluorescent. Unable to grow at 4 and 45 °C. Positive for gelatinase activity. Grows well over a broad range of pH values (6·09·0) but grows better in neutral or weakly alkaline conditions (pH 7·08·0). Major cellular fatty acids are 15 : 0 iso and 17 : 0 iso 3OH. Positive reactions observed for alkaline phosphatase, butyrate esterase, carprylate esterase, myristate lipase, leucine arylamidase, valine arylamidase, cystine arylamidase, trypsin,
-chymotrypsin, acid phosphatase, naphthol-AS-Bl-phosphohydrolase,
-glucuronidase,
-glucosidase,
-glucosidase and N-acetyl-
-glucosaminidase. No enzymic activities found for
-galactosidase,
-mannosidase or
-fucosidase. Weakly positive for indole production, cytochrome oxidase activity and
-galactosidase (ONPG test), but negative for arginine dihydrolase, lysine decarboxylase, citrate utilization, H2S production, urease and tryptophan deaminase. Strain CC-TWGS1-8T shows weak production of acid from adonitol, D-glucose, i-inositol, D-maltose, L-rhamnose, D-trehalose and D-xylose. No acid is produced from L-arabinose, D-arabitol, dulcitol, erythritol, lactose, D-mannitol, D-melibiose, methyl
-D-glucoside, raffinose, salicin, D-sorbitol or sucrose. The following compounds are not utilized as sole sources of carbon: D-glucose, D-maltose, D-mannose, D-trehalose, acetate, propionate, N-acetylgalactosamine, N-acetylglucosamine, L-arabinose, L-arbutin, D-cellobiose, D-galactose, gluconate, glycerol, D-fructose, D-mannitol, maltitol,
-D-melibiose, L-rhamnose, D-ribose, D-sucrose, salicin, D-trehalose, D-xylose, adonitol, i-inositol, D-sorbitol, putrescine, cis-aconitate, trans-aconitate, 4-aminobutyrate, adipate, azelate, fumarate, glutarate, DL-3-hydroxybutyrate, itaconate, DL-lactate, 2-oxoglutarate, pyruvate, suberate, citrate, mesaconate, L-alanine,
-alanine, L-ornithine, L-phenylalanine, L-serine, L-aspartate, L-histidine, L-leucine, L-proline, L-tryptophan, 3-hydroxybenzoate, 4-hydroxybenzoate and phenylacetate. The chromogenic substrates p-nitrophenyl-
-D-glucopyranoside, p-nitrophenyl-
-D-glucopyranoside, p-nitrophenyl-
-D-galactopyranoside and p-nitrophenyl-
-D-xylopyranoside, bis(p-nitrophenyl) phosphate, bis(p-nitrophenyl) phenylphosphonate, bis-p-nitrophenylphosphorylcholine, 2-deoxythymidine 2'-p-nitrophenyl-phosphate, L-alanine-p-nitroanilide,
-L-glutamate-p-nitroanilide and L-proline-p-nitroanilide are hydrolysed. p-Nitrophenyl
-D-glucuronide is not hydrolysed.
The type strain is CC-TWGS1-8T (=CCUG 50001T=CIP 108519T), which was isolated from tar-contaminated soil in Taichung, Taiwan.
| ACKNOWLEDGEMENTS |
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