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1 The Key Laboratory for Microbial Resources of Ministry of Education, Yunnan Institute of Microbiology, Yunnan University, Kunming, Yunnan 650091, P. R. China
2 DSMZ Deutsche Sammlung von Mikroorganismen und Zellkulturen, Mascheroder Weg 1b, D-38124 Braunschweig, Germany
3 GBF Gesellschaft für Biotechnologische Forschung, Mascheroder Weg 1, D-38124 Braunschweig, Germany
Correspondence
Erko Stackebrandt
erko{at}dsmz.de
| ABSTRACT |
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(L-lys
L-thr
D-Glu), contains glucose, mannose and galactose as whole cell sugars and has MK-9(H4) and MK-9(H6) as major menaquinones, while phospholipids are phosphatidylglycerol, diphosphatidylglycerol, phosphatidylinositol, three unidentified phospholipids and one unidentified glycolipid. The DNA base composition is 71·9 mol% G+C. On the basis of morphological, chemotaxonomic, metabolic and phylogenetic differences from other species of Promicromonosporaceae, a new genus and species, Myceligenerans xiligouense gen. nov., sp. nov., is proposed. The type strain is XLG9A10.2T (=DSM 15700T=CGMCC 1.3458T.)
Additional images showing the morphology of M. xiligouense are available in IJSEM Online.
| MAIN TEXT |
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Strain XLG9A10.2T was isolated from a pasture near an alkaline salt marsh in the Qinghai province, western China. Isolation was done at 28 °C by dilution plating on Bacto marine agar, pH 7·2. Reference strains (see Table 2
) were cultivated on BBL tryptic soy broth agar (TSBA, supplemented with 1·5 % agar; both from Difco) and Bacto marine broth agar (MBA; supplemented with 1·5 % agar).
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Scanning electron microscopy was performed with cells grown for 7 days on TSBA. Cell preparation dehydration and staining procedures were carried out as described by Rheims et al. (1998)
. Cells were examined with a Zeiss model DSM 982 SEM.
Isolate XLG9A10.2T stained Gram-positive and formed yellowish colonies (about 15 mm in diameter) on MBA medium (Supplementary Fig. A in IJSEM Online) and yellow colonies (about 1·55 mm in diameter) on TSBA medium (Supplementary Fig. B) after 7 days incubation at 28 °C. A well developed branching mycelium (about 0·4 µm in diameter) with abundant coccoid and non-motile spores (0·5 mm in diameter) was observed (Fig. 1
a; also Supplementary Figs A and B). Scanning electron micrographs are shown in Fig. 1(b)
and Supplementary Figs C and D. Comparison of the morphology revealed similarities between strain XLG9A10.2T and authentic Promicromonospora strains (see below) (Table 1
), while differences were observed between XLG9A10.2T, Xylanimonas cellulosilytica, Isoptericola variabilis (Stackebrandt et al., 2004
) and Promicromonospora pachnodae DSM 12657T. The presence of spores, which did not survive heat treatment at 80 °C for 5 min, was demonstrated by light- and electron microscopy (Fig. 1a and b
, also Supplementary Figs A and D). These conditions were likewise not tolerated by spores and spore-like elements of strains of the distantly related Oerskovia enterophila (basonym Promicromonospora enterophila) (Jáger et al., 1983
).
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The results of physiological tests of strain XLG9A10.2T are given in the species description. In contrast to members of Promicromonospora and Xylanimonas, strain XLG9A10.2T utilized sedoheptulosan, stachyose, 2,3-butanediol, glucose 1-phosphate, glucose 6-phosphate and DL-
-glycerol phosphate (compared with Promicromonospora citrea, Promicromonospora sukumoe, P. pachnodae and Isoptericola variabilis), but not D-arabinose, methyl
-xyloside, methyl
-D-mannoside, D-lyxose (compared with P. citrea and P. sukumoe) and N-acetyl-D-glucosamine, N-acetyl-D-mannosamine, adenosine 5'-monophosphate and thymidine 5'-monophosphate (compared with P. pachnodae and I. variabilis; Table 2
).
For chemotaxonomic analyses, the organisms were grown in BBL tryptic soy broth in flasks on a rotary shaker at 90 r.p.m. and 28 °C. The biomass was harvested by centrifugation, washed twice with distilled water and freeze-dried. Sugar analysis of purified cell walls was performed as described by Stanek & Roberts (1974)
. Purified cell wall preparations were obtained by the method of Schleifer & Kandler (1972)
. Peptidoglycan structure was elucidated by analysis of cell wall hydrolysates employing the following methods: qualitative analysis of amino acids and peptides by two-dimensional TLC on cellulose plates using solvent systems described previously (Schleifer & Kandler, 1972
), quantitative amino acid analysis by GC and GC/MS (MacKenzie, 1987
; Groth et al., 1996
) and dinitrophenylation of N-terminal amino acids of the interpeptide bridge (Schleifer, 1985
). Polar lipids extracted by the method of Minnikin et al. (1979)
were identified by two-dimensional TLC and spraying with specific reagents (Collins & Jones, 1980
). Menaquinones were analysed by HPLC as described previously (Groth et al., 1996
). Fatty acid methyl esters were extracted and prepared by the standard protocol of the Microbial Identification System (MIDI; Microbial ID). Extracts were analysed using a Hewlett Packard model HP6890A gas chromatograph equipped with a flame-ionization detector as described previously (Kämpfer & Kroppenstedt, 1996
).
The peptidoglycan of strain XLG9A10.2T contained the amino acids Lys, Thr, Ala and Glu and belonged to the type A4
: L-lys
L-thr
D-Glu [variation A11.57, according to DSMZ (2001)
], which has hitherto not been found in strains of Promicromononsporaceae.
The polar lipids were identified as phosphatidylglycerol, diphosphatidylglycerol, phosphatidylinositol, three unidentified phospholipids and one unidentified glycolipid.
Determination of the base composition of DNA by reverse-phase HPLC of nucleosides (Mesbah et al., 1989
) followed cell disruption by French pressure cell and purification of DNA by chromatography on hydroxyapatite as described by Cashion et al. (1977)
. The DNA base composition was 71·9 mol% G+C.
For sequence analysis of the 16S rRNA gene, extraction of genomic DNA, PCR-mediated amplification of 16S rDNA and purification of PCR products were done as described previously (Rainey et al., 1996
). Electrophoresis of sequencing reaction products was done using a Beckman CEQ 2000 sequencer according to the manufacturer's protocols. The resulting 16S rDNA sequence was compared to sequences from the GenBank database. CLUSTAL X (Thompson et al., 1997
) was used to align the XLG9A10.2T sequence to those of representatives of each family in the suborder Micrococcineae and all members of the family Promicromonosporaceae. The resulting 16S rDNA sequence alignment was then manually checked using BioEdit 5.0.9 (Hall, 1999
), taking the secondary structure into account. A phylogenetic tree (Fig. 2
) was inferred using the neighbour-joining method (Saitou & Nei, 1987
), using a distance matrix corrected by Kimura's 2-parameter method (Kimura, 1980
). Bootstrap analysis was based on 1000 resamplings.
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On the basis of differentiating phenotypic and genotypic evidence we propose a new genus Myceligenerans gen. nov., with the type species Myceligenerans xiligouense sp. nov., of which the type strain is XLG9A10.2T.
Description of Myceligenerans gen. nov.
Myceligenerans (My.ce.li.ge'ne.rans. N.L. neut. n. mycelium filamentous cells; L. part. adj. generans producing; N.L. subst. Myceligenerans hyphae-forming microbe).
Gram-positive, mycelium-and spore-forming organism. Substrate mycelia are well developed and branched in and on the medium. Aerial mycelium absent. The surface of substrate mycelium bears fragmented cells and spore chains with one or two spores at the tips of the mycelium. Spores are coccoid and non-motile. Peptidoglycan type is A4
, variation L-lys
L-thr
D-Glu. Cell wall sugars are glucose, mannose and galactose. Major menaquinones are MK-9(H4) and MK-9(H6); predominant fatty acids are ai-C15 : 0, i-C15 : 0; cells contain phosphatidylglycerol, diphosphatidylglycerol, phospatidylinositol, three unidentified phospholipids and one unidentified glycolipid. The G+C content is 72 mol%. The type species is Myceligenerans xiligouense.
Description of Myceligenerans xiligouense sp. nov.
Myceligenerans xiligouense (xi.li.gou.en'se. N.L. neut. adj. xiligouense pertaining to Xiligou, a location in China where the type strain was isolated).
Displays the following properties in addition to those in the genus description. Colonies are yellowish (about 15 mm in diameter) on MBA medium and yellow (about 1·55 mm in diameter) on TSBA medium after 7 days incubation at 28 °C. Aerobic, though carbohydrates are fermented under microaerophilic conditions as determined by API 50CHE. Grows at between 4 and 50 °C, with optimal growth between 20 and 30 °C; between pH 4 and 13 with optimal growth between pH 7 and 9; and at salt concentrations between 2 and 17·5 % (NaCl, w/v), with optimum growth between 2 and 7 %. Physiological properties are indicated in Table 2
. Chemotaxonomic characteristics are as described for the genus. DNA base composition is 71·9 mol% G+C. The type strain, XLG9A10.2T (=DSM 15700T=CGMCC 1.3458T) was isolated from a pasture near an alkaline salt marsh, Qinghai Province, western China.
| ACKNOWLEDGEMENTS |
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| REFERENCES |
|---|
|
|
|---|
Busse, H. J., Zlamala, C., Buczolits, S., Lubitz, W., Kämpfer, P. & Takeuchi, M. (2003). Promicromonospora vindobonensis sp. nov. and Promicromonospora aerolata sp. nov., two novel species isolated from the air of the medieval Virgilkapelle in Vienna. Int J Syst Evol Microbiol 53, 15031507.
Cashion, P., Holder-Franklin, M. A., McCully, J. & Franklin, M. (1977). A rapid method for the base ratio determination of bacterial DNA. Anal Biochem 81, 461466.[CrossRef][Medline]
Cazemier, A. E., Verdoes, J. C., Reubsaet, F. A. G., Hackstein, J. H. P., van der Drift, C. & Op den Camp, H. J. M. (2003). Promicromonospora pachnodae sp. nov., a member of the (hemi)cellulolytic hindgut flora of larvae of the scarab beetle Pachnoda marginata. Antonie van Leeuwenhoek 83, 135148.[CrossRef][Medline]
Collins, M. D. & Jones, D. (1980). Lipids in the classification and identification of coryneform bacteria containing peptidoglycans based on 2,4-diaminobutyric acid. J Appl Bacteriol 48, 459470.
Doetsch, R. N. (1981). Determinative methods of light microscopy. In Manual of Methods for General Bacteriology, pp. 2133. Edited by P. Gerhard, R. G. E. Murray, R. N. Costilow, E. W. Nester, W. A. Wood, N. R. Krieg & G. B. Phillips. Washington, DC: American Society for Microbiology.
DSMZ (2001). Catalogue of Strains, 7th edn. Braunschweig, Germany: DSMZ.
Evtushenko, L. I., Levanova, G. F. & Agre, N. S. (1984). Nucleotide composition of DNA and amino acid composition of A4 peptidoglycan in Promicromonospora citrea. Mikrobiologiya 53, 519520.
Groth, I., Schumann, P., Weiss, N., Martin, K. & Rainey, F. A. (1996). Agrococcus jenensis gen. nov., sp. nov., a new genus of actinomycetes with diaminobutyric acid in the cell wall. Int J Syst Bacteriol 46, 234239.
Hall, T. A. (1999). BioEdit: a user-friendly biological sequence alignment editor and analysis program for Windows 95/98/NT. Nucleic Acids Symp Ser 41, 9598.
Jáger, K., Márialigeti, K., Hauck, M. & Barabás, G. (1983). Promicromonospora enterophila sp. nov., a new species of monospore actinomycetes. Int J Syst Bacteriol 33, 525531.
Kalakoutskii, L. V., Agre, N. S., Prauser, H. & Evtushenko, L. I. (1989). Genus Promicromonospora. In Bergey's Manual of Systematic Bacteriology, vol. 4, pp. 23922395. Edited by S. T. Williams. M. E. Sharpe & J. G. Holt. Baltimore: Williams & Wilkins.
Kämpfer, P. & Kroppenstedt, R. M. (1996). Numerical analysis of fatty acid patterns of coryneform bacteria and related taxa. Can J Microbiol 42, 9891005.
Kimura, M. (1980). A simple method for estimating evolutionary rates of base substitutions through comparative studies of nucleotide sequences. J Mol Evol 16, 111120.[CrossRef][Medline]
Krasilnikov, N. A., Kalakoutskii, L. V. & Kirillova, N. F. (1961). A new genus of Actinomycetales, Promicromonospora, gen. nov. Bull Acad Sci USSR Ser Biol 1, 107112.
MacKenzie, S. L. (1987). Gas chromatographic analysis of amino acids as the N-heptafluorobutyryl isobutyl esters. J Assoc Off Anal Chem 70, 151160.[Medline]
Mesbah, M., Premachandran, U. & Whitman, W. B. (1989). Precise measurement of the G+C content of deoxyribonucleic acid by high-performance liquid chromatography. Int J Syst Bacteriol 39, 159167.
Minnikin, D. E., Collins, M. D. & Goodfellow, M. (1979). Fatty acid and polar lipid composition in the classification of Cellulomonas, Oerskovia and related taxa. J Appl Bacteriol 47, 8795.
Rainey, F. A., Ward-Rainey, N., Kroppenstedt, R. M. & Stackebrandt, E. (1996). The genus Nocardiopsis represents a phylogenetically coherent taxon and a distinct actinomycete lineage: proposal of Nocardiopsaceae fam. nov. Int J Syst Bacteriol 46, 10881092.
Rheims, H., Schumann, P., Rohde, M. & Stackebrandt, E. (1998). Verrucosispora gifhornensis gen. nov. sp. nov, a new member of the actinobacterial family Micromonosporaceae. Int J Syst Bacteriol 48, 11191127.
Rivas, R., Sánchez, M., Trujillo, M. E., Zurdo-Piñeiro, J. L., Mateos, P. F., Martínez-Molina, E. & Velázquez, E. (2003). Xylanimonas cellulosilytica gen. nov., sp. nov., a xylanolytic bacterium isolated from a decayed tree (Ulmus nigra). Int J Syst Evol Microbiol 53, 99103.
Rivas, R., Trujillo, M. E., Schumann, P., Kroppenstedt, R. M., Sánchez, M., Mateos, P. F., Mártinez-Molina, E. & Velázquez, E. (2004). Xylanibacterium ulmi gen. nov., sp. nov., a novel xylanolytic member of the family Promicromonosporaceae. Int J Syst Evol Microbiol 54, 557561.
Saitou, N. & Nei, M. (1987). The neighbor-joining method: a new method for reconstructing phylogenetic trees. Mol Biol Evol 4, 406425.[Abstract]
Schleifer, K. H. (1985). Analysis of the chemical composition and primary structure of murein. Methods Microbiol 18, 123156.
Schleifer, K. H. & Kandler, O. (1972). Peptidoglycan types of bacterial cell walls and their taxonomic implications. Bacteriol Rev 36, 407477.
Schumann, P., Weiss, N. & Stackebrandt, E. (2001). Reclassification of Cellulomonas cellulans (Stackebrandt and Keddie 1986) as Cellulosimicrobium cellulans gen. nov., comb. nov. Int J Syst Evol Microbiol 51, 10071010.[Abstract]
Stackebrandt, E. & Schumann, P. (2000). Description of Bogoriellaceae fam. nov., Dermacoccaceae fam. nov., Rarobacteraceae fam. nov. and Sanguibacteraceae fam. nov. and emendation of some families of the suborder Micrococcineae. Int J Syst Evol Microbiol 50, 12791285.[Abstract]
Stackebrandt, E. & Schumann, P. (2004). Reclassification of Promicromonospora pachnodae Cazemier et al. 2004
as Xylanimicrobium pachnodae gen. nov., comb. nov. Int J Syst Evol Microbiol (in press).
Stackebrandt, E., Rainey, F. A. & Ward-Rainey, N. L. (1997). Proposal for a new hierarchic classification system, Actinobacteria classis nov. Int J Syst Bacteriol 47, 479491.
Stackebrandt, E., Schumann, P. & Cui, X.-L. (2004). Reclassification of Cellulosimicrobium variabile Bakalidou et al. 2002
as Isoptericola variabilis gen. nov., comb. nov. Int J Syst Evol Microbiol 54, 685688.
Stanek, J. L. & Roberts, G. D. (1974). Simplified approach to identification of aerobic actinomycetes by thin layer chromatography. Appl Microbiol 28, 226231.[Medline]
Takahashi, Y., Tanaka, Y., Iwai, Y. & Omura, S. (1987). Promicromonospora sukumoe sp. nov., a new species of the Actinomycetales. J Gen Appl Microbiol 33, 507519.[CrossRef]
Thompson, J. D., Gibson, T. J., Plewniak, F., Jeanmougin, F. & Higgins, D. G. (1997). The CLUSTAL_X windows interface: flexible strategies for multiple sequence alignment aided by quality analysis tools. Nucleic Acids Res 24, 48764882.
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