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1 Institut für Medizinische Mikrobiologie und Immunologie der Universität Bonn, 53127 Bonn, Germany
2 Kekulé-Institut für Organische Chemie und Biochemie der Universität Bonn, 53121 Bonn, Germany
Correspondence
A. F. Yassin
yassin{at}mibi03.meb.uni-bonn.de
The taxonomic status of two bacterial strains isolated from human blood was characterized using a polyphasic approach. Chemotaxonomic investigations revealed the presence of cell-wall chemotype IV, short-chain mycolic acids that co-migrated with those extracted from members of the genus Williamsia and that produce C16 : 0 and C18 : 0 fatty acids on pyrolysis GC, and dihydrogenated menaquinone with nine isoprene units as the predominant isoprenologue. The generic assignment was confirmed by 16S rRNA gene sequencing. Comparative analysis of the 16S rRNA gene sequence showed that these isolates constitute a distinct phyletic line within the genus Williamsia, displaying 96·2 and 97·2 % sequence similarities to Williamsia muralis and Williamsia maris, respectively. The two isolates could be distinguished from the type strains of the latter species on the basis of several phenotypic traits. The genotypic and phenotypic data show that the strains merit classification as a novel species of Williamsia, for which the name Williamsia deligens sp. nov. is proposed, with type strain IMMIB RIV-956T (=DSM 44902T=CCUG 50873T).
The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strains IMMIB RIV-956T and IMMIB RIV-956Fl are AJ920290 and AJ920291, respectively.
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