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Int J Syst Bacteriol 48 (1998), 441-449; DOI 10.1099/00207713-48-2-441
© 1998 Society for General Microbiology
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Pseudonocardia asaccharolytica sp. nov. and Pseudonocardia sulfidoxydans sp. nov., two new dimethyl disulfide-degrading actinomycetes and emended description of the genus Pseudonocardia

Katrin Reichert1, André Lipski1, Silke Pradella2, Erko Stackebrandt2 and Karlheinz Altendorf1

1Abteilung Mikrobiologie, Universität Osnabrück, Fachbereich Biologie/Chemie, D-49069 Osnabrück, Germany
2Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Mascheroder Weg 1b, D-38124 Braunschweig, Germany

Author for correspondence: André Lipski. Fax: +49 541 969 2870. e-mail: Lipski{at}sfbbiol.biologie.uni-osnabrueck.de

ABSTRACT

Seven bacterial strains capable of oxidizing methyl sulfides were isolated from experimental biofilters filled with tree-bark compost. The isolates could be divided into two groups according to their method of methyl sulfide degradation. Four isolates could use only dimethyl disulfide as the sole source of energy and three strains were able to use dimethyl sulfide and dimethyl disulfide. Oxidation of the methyl sulfides by both groups led to the stoichiometric formation of sulfate. Chemotaxonomic, morphological, physiological and phylogenetic properties identified all isolates as members of the genus Pseudonocardia. The absence of phosphatidylcholine from the polar lipid pattern, as well as results of 165 rDNA analyses, led to the proposal of two new species, Pseudonocardia asaccharolytica sp. nov. and Pseudonocardia sulfidoxydans sp. nov. The type strains are P. asaccharolytica DSM 44247Tand P. sulfidoxydans DSM 44248T. With respect to the characteristic polar lipid pattern and the ability to oxidize sulfides, an emended description of the genus Pseudonocardia is proposed.

Key Words: Pseudonocardia asaccharolytica sp. nov. • Pseudonocardia sulfidoxydans sp. nov. • methyl sulfide-degrading actinomycetes • biofilters

The EMBL accession numbers for the sequences reported in this paper are Y08534-Y08537.




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