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1Department of Microbiology, BBSRC Institute of Food Research, Reading Laboratory, Reading, UK
2Special Bacteriology Section, Laboratory Centre for Disease Control, Winnipeg, Manitoba, Canada
3Culture Collection, Department of Clinical Bacteriology, University of Göteborg, Sweden
4Laboratory of Clinical Bacteriology, Sundsvall Hospital, Sundsvall, Sweden
Author for correspondence: Enevold Falsen. Tel: +46 31 342 46 25. Fax: +46 31 82 54 84. e-mail: ccucef{at}ccug.gu.se
ABSTRACT
Three strains of a previously undescribed catalase-positive non-lipophilic coryneform bacterium isolated from human clinical specimens were characterized by phenotypic and molecular taxonomic methods. Morphologically the unknown bacterium consisted of pleomorphic rods, some of which displayed bulges/knobs at their ends. All three strains were similar in that they produced acid from fructose, glucose, maltose and sucrose and were urease-positive. Chemotaxonomic investigations revealed the presence of meso-diaminopimelic acid and short-chain mycolic acids consistent with the genus Corynebacterium sensu stricto. Comparative 16S rRNA gene sequencing showed that the three strains are genealogically highly related and constitute a new subline within the genus Corynebacterium, displaying >3% sequence divergence with recognized species. The unknown bacterium was distinguished from currently validly published Corynebacterium species by phenotypic tests, including electrophoretic analysis of whole-cell proteins. Based on phylogenetic and phenotypic evidence, it is proposed that the unknown bacterium from clinical specimens be classified as Corynebacterium sundsvallense sp. nov. The type strain is CCUG 36622T.
Key Words: Corynebacterium sundsvallense sp. nov. • taxonomy • phylogeny • rRNA
The GenBank accession number for the 16S rRNA gene sequence of strain CCUG 36622Tis Y09655.
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