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Conexibacter woesei gen. nov., sp. nov., a novel representative of a deep evolutionary line of descent within the class Actinobacteria

¹ Biosearch Italia, via Lepetit 34, 21040 Gerenzano (VA), Italy
² DSMZ – Deutsche Sammlung von Mikroorganismen und Zellkulturen, D-38124 Braunschweig, Germany
³ GBF – Gesellschaft für Biotechnologische Forschung, D-38124 Braunschweig, Germany

Correspondence
Stefano Donadio
sdonadio{at}biosearch.it

A novel Gram-positive bacterial strain was isolated from forest soil. According to its 16S rRNA sequence, this strain is a deep-rooting member of the class Actinobacteria. The 16S rRNA sequence is most closely related (94 % identity) to clones of uncultured bacteria detected in different terrestrial environments, while showing only a remote relationship (90 % identity or less) to sequences of cultured species. Cells of the first cultured representative of this phylogenetic cluster are small, short rods that are motile by peritrichous flagella, catalase- and oxidase-positive and grow under aerobic conditions. In liquid culture, flagella from different cells can aggregate to form networks, clearly visible under the light microscope. The peptidoglycan contains meso-diaminopimelic acid and is directly cross-linked (type A1). Mycolic acids are not present. The polar lipids are phosphatidylinositol and an unidentified phospholipid. Menaquinone MK-7(H₄) was detected as the predominant isoprenoid quinone. Oleic, 14-methylpentadecanoic, hexadecanoic and 6c-heptadecenoic acids are the predominant components of the cellular fatty acid profile. The DNA G+C content is 71 mol%. The distinct phylogenetic position and the unusual combination of chemotaxonomic characteristics justify the proposal of a new genus and species, Conexibacter woesei gen. nov., sp. nov., with the type strain ID131577^T (=DSM 14684^T =JCM 11494^T).

Published online ahead of print on 9 September 2002 as DOI 10.1099/ijs.0.02400-0.

The GenBank/EMBL/DDBJ accession numbers for the 16S and 23S rRNA gene sequences of strain ID 131577^T are respectively AJ440237 and AJ440238.

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