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Int J Syst Bacteriol 49 (1999), 681-687; DOI 10.1099/00207713-49-2-681
© 1999 Society for General Microbiology
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Williamsia muralis gen. nov., sp. nov., isolated from the indoor environment of a children's day care centre

Peter Kämpfer1, Maria A. Andersson2, Fred A. Rainey3, Reiner M. Kroppenstedt4 and Mirja Salkinoja-Salonen2

1Institut für Angewandte Mikrobiologie, Justus-Liebig Universität, Senckenbergstr. 3, D-35390 Giessen, Germany
2Department of Applied Chemistry and Microbiology, PO Box 56 (Biocentre), 00014 University of Helsinki, Finland
3Department of Biological Sciences, 508 Life Sciences Building, Louisiana State University, Baton Rouge, LA 70803, USA
4DSMZ-Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Mascheroder Weg 1b, D-38124 Braunschweig, Germany

Author for correspondence: Peter Kämpfer. Tel: +49 641 99 37352. Fax: +49 641 99 37359. e-mail: peter.kaempfer{at}agrar.uni-giessen.de

ABSTRACT

The taxonomic status of an actinomycete (MA140/96T) isolated from indoor building materials of a children's day care centre was studied using the polyphasic approach. The cell morphology was atypical for an actinomycete, electron microscopy revealed a hairy surface, highly unusual for Gram-positi bacteria. The organisms grew at 10--37°C no growth was visible at 5 °C and 45 °C in 5 d. The cell wall contained the diamino acid meso-diaminopimelic acid and the sugars arabinose, galactose, mannose and ribose. The phospholipids phosphatidylethanolamine, phosphatidylethanolamine, phosphatidylinositol, phosphatidylglycerol and diphosphatidylglycerol were detected. The only menaquinone found was MK9(H2). The fatty acid pattern was composed of palmitic acid (23.6%) palmitole acid (16.5%) and another hexadecenoic acid 16:1cis11 (1.4%), oleic acid (29.9%), stearic acid (2.9%) and the 10-methyl-branched tuberculostearic acid (23.2%). A gas-chromatographic analysis of the mycolic acid revealed a carbo chain length of C50-C56The G+C was 64.8 mol%. The results of 16S rDNA sequence comparisons revealed that strain MA140/96Trepresents a new lineage in the suborder Corynebacterineae of the order Actinomycetales. Therefore, it was concluded that strain MA140/96Tshould be assigned to a new genus and species, for which the name Williamsia muralis gen. nov., sp. nov. proposed. The type strain of the species is MA140/96T(= DSM 44343T).

Key Words: Williamsia muralis gen. nov. • sp. nov. • actinomycete • indoor contaminant

The EMBL accession number for the 16S rDNA sequence of strain MA140/96Tis Y17384.




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