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1 Institut für Mikrobiologie und Genetik, Universität Wien, A-1030 Wien, Austria
2 Institut für Bakteriologie, Mykologie und Hygiene, Veterinärmedizinische Universität, A-1210 Wien, Austria
3 Institut für Angewandte Mikrobiologie, Justus-Liebig-Universität, D-35392 Giessen, Germany
Correspondence
Hans-Jürgen Busse
Hans-Juergen.Busse{at}vu-wien.ac.at
| ABSTRACT |
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The GenBank/EMBL/DDBJ accession number for the 16S rDNA sequence of B. barbaricus V2-BIII-A2T is AJ422145.
| MAIN TEXT |
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The 16S rDNA sequence of strain V2-BIII-A2T, selected for reference, was analysed as described previously (Buczolits et al., 2002
) and a stretch of 1421 bases was obtained (positions 501467, Escherichia coli numbering; Brosius et al., 1978
). Highest 16S rDNA sequence similarities of V2-BIII-A2T were obtained to Bacillus megaterium DSM 32T (94·6 %), Bacillus flexus DSM 1320T (94·4 %) and the obligate alkaliphile Bacillus cohnii LMG 16678T (94·2 %). These values clearly allocate V2-BIII-A2T to Bacillus rRNA group 1 (Ash et al., 1991
) and demonstrate that it represents a novel species. From a collection of 35 isolates with highly similar protein patterns, including strain V2-BIII-A2T, which were isolated in October 1999 from the wall painting exposed in the chapel Virgilkapelle, strains V2-BI-09, V2-BI-A4 and V2-BII-A8 were selected for further taxonomic characterization. Comparison of genomic fingerprints of these four strains obtained after ERIC (enterobacterial repetitive intergenic consensus)-PCR (Wieser & Busse, 2000
) supported their affiliation to a single species and clearly distinguished them from selected reference strains (Fig. 1
).
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Colonies of the four isolates V2-BIII-A2T, V2-BI-09, V2-BI-A4 and V2-BII-A8 were brownish, opaque and flat and reached a maximum of 7 mm in diameter when grown on PYES medium (0·3 % peptone from casein, 0·3 % yeast extract, 0·23 % disodium succinate, pH 7·2). Younger colonies had an entire margin, but older colonies sometimes became frayed. Cells were rod-shaped, occurring singly or in filamentous chains. Spores were oval in a swollen sporangium. Cells were Gram-positive, as shown by Gram-staining, KOH test and aminopeptidase test (Moaledj, 1986
). Growth at different temperatures was investigated on PYES medium. The four strains grew well in the range 1837 °C; after 3 weeks of incubation, no growth was observed at 4 or 47 °C. The four strains grew only weakly on PYES medium supplemented with 2 % NaCl (w/v) and no growth was observed in the presence of 5 or 10 % NaCl (w/v) after 3 weeks of incubation. Good growth on PYES agar was observed for all four isolates under anaerobic conditions as described by Altenburger et al. (2002)
, whereas no growth was detected when the strains were incubated on PYES agar under microaerobic conditions as described by Fox et al. (1994)
. This lack of growth may be due to the 5 % H2 present in the microaerobic atmosphere. In experiments where the pH of PYES medium was adjusted with HCl or NaOH before autoclaving, the strains grew weakly at pH 6·0 and strongly at pH 7·2, 8·0 and 9·5, indicating alkalitolerance of the isolates. The type strain (LMG 16678T) of the alkaliphilic species B. cohnii (Spanka & Fritze, 1993
), which was incubated under the same conditions, grew strongly at pH 9·5, moderately at pH 8·0 and not at all at pH 7·2. When the pH was adjusted as described by Nielson et al. (1995)
using buffered systems, no growth of the four isolates was observed at pH 7·0, 8·0, 9·0, 10·0 or 11·0, whereas B. cohnii LMG 16678T grew best at pH 811. Good growth of the four strains was observed on a medium recommended for cultivation of B. cohnii LMG 16678T (0·3 % yeast extract, 0·5 % peptone, 0·5 % NaCl), adjusted to pH 9·5 with Na2CO3 after autoclaving.
The physiological and biochemical properties of the four novel isolates, B. megaterium DSM 32T, B. flexus DSM 1320T and B. cohnii LMG 16678T were analysed as described by Kämpfer et al. (1991)
and are summarized in Table 1
. Strains V2-BIII-A2T, V2-BI-09, V2-BI-A4 and V2-BII-A8 only showed varying results for assimilation of 4-aminobutyrate, fumarate, L-leucine and L-ornithine. The four isolates displayed very similar acid-production profiles from carbohydrates with the API 50 CHB system (see species description).
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Description of Bacillus barbaricus sp. nov.
Bacillus barbaricus (bar.ba'ri.cus. L. adj. barbaricus strange, foreign, referring to the strange behaviour towards growth at different pH).
Cells are Gram-positive, non-motile rods that produce subterminal, oval endospores in a swollen sporangium. Cells are 0·5 µm wide and 45 µm long. Colonies are brownish, opaque, circular, flat and 37 mm in diameter when grown on PYES agar. Facultatively anaerobic. Catalase-positive. Oxidase- and urease-negative. Nitrate is not reduced. Indole and H2S are not produced. Alkalitolerant. Good growth occurs at temperatures ranging from 18 to 37 °C. No growth at 4 or 47 °C or in the presence of 5 or 10 % NaCl, and only weak growth in 2 % NaCl. Acid is produced from D-glucose, N-acetylglucosamine, aesculin, maltose, trehalose, starch and glycogen. Acid production is variable from D-fructose (V2-BIII-A2T is weakly positive), galactose, methyl
-D-glucoside, lactose, sucrose and D-turanose (V2-BIII-A2T is negative). No acid is produced from glycerol, erythritol, D-arabinose, ribose, D-xylose, L-xylose, adonitol, methyl
-xyloside, D-mannose, L-sorbose, rhamnose, dulcitol, inositol, mannitol, sorbitol, methyl
-D-mannoside, amygdalin, arbutin, salicin, cellobiose, melibiose, inulin, melezitose, D-raffinose, xylitol,
-gentiobiose, D-lyxose, D-tagatose, D-fucose, L-fucose, D-arabitol, L-arabitol, gluconate, 2-ketogluconate or 5-ketogluconate. Other physiological and biochemical characteristics are given in Table 1
. The cell-wall diamino acid is diaminopimelic acid and MK-7 is the predominant menaquinone. The polar lipid profile is composed of the major compounds phosphatidylethanolamine, phosphatidylglycerol and diphosphatidylglycerol and minor amounts of an unknown phospholipid, an unknown aminophospholipid, an unknown aminolipid and one unknown polar lipid. The fatty acid profile consists of the predominant compounds ai-C15 : 0 and i-C15 : 0; i-C14 : 0 and i-C16 : 0 are present in moderate amounts.
The type strain, V2-BIII-A2T (=CCM 4982T=DSM 14730T), was isolated from an experimental wall painting exposed in the Virgilkapelle in Vienna, Austria.
| ACKNOWLEDGEMENTS |
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