title: Conexibacter woesei gen. nov., sp. nov., a novel representative of a deep evolutionary line of descent within the class Actinobacteria.
abstract: 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 (approximately 94% identity) to clones of uncultured bacteria detected in different terrestrial environments, while showing only a remote relationship (approximately 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 A1gamma). 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 omega6c-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 ID131577T (=DSM 14684T =JCM 11494T).
authors.affiliation: Biosearch Italia, via Lepetit 34, 21040 Gerenzano (VA), Italy.
authors.forename: Paolo
authors.initials: P
authors.lastname: Monciardini
authors.affiliation: Biosearch Italia, via Lepetit 34, 21040 Gerenzano (VA), Italy.
authors.forename: Linda
authors.initials: L
authors.lastname: Cavaletti
authors.affiliation: DSMZ - Deutsche Sammlung von Mikroorganismen und Zellkulturen, D-38124 Braunschweig, Germany.
authors.forename: Peter
authors.initials: P
authors.lastname: Schumann
authors.affiliation: GBF - Gesellschaft für Biotechnologische Forschung, D-38124 Braunschweig, Germany.
authors.forename: Manfred
authors.initials: M
authors.lastname: Rohde
authors.affiliation: Biosearch Italia, via Lepetit 34, 21040 Gerenzano (VA), Italy.
authors.forename: Stefano
authors.initials: S
authors.lastname: Donadio
mesh_terms: D039903:Actinobacteria / Q000737:chemistry / Q000145:classification* / Q000235:genetics / Q000502:physiology; D005075:Biological Evolution; D002473:Cell Wall / Q000737:chemistry*; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D003960:Diaminopimelic Acid / Q000378:metabolism*; D005227:Fatty Acids / Q000032:analysis; D008854:Microscopy, Electron; D008969:Molecular Sequence Data; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000032:analysis; D012988:Soil Microbiology
chemical_list: D004269:DNA, Bacterial; D005227:Fatty Acids; D012336:RNA, Ribosomal, 16S; D003960:Diaminopimelic Acid