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Atopococcus tabaci gen. nov., sp. nov., a novel Gram-positive, catalase-negative, coccus-shaped bacterium isolated from tobacco

¹ School of Food Biosciences, University of Reading, Reading, UK
² Swedish Match North Europe, Maria Skolgata 83 1tr, S-11885 Stockholm, Sweden
³ Culture Collection, Department of Clinical Bacteriology, University of Göteborg, Sweden
⁴ Department of Botany and Microbiology, University of Oklahoma, Norman, OK, USA

Correspondence
Paul A. Lawson
paul.lawson{at}ou.edu

A novel Gram-positive, aerobic, catalase-negative, coccus-shaped organism originating from tobacco was characterized using phenotypic and molecular taxonomic methods. The organism contained a cell wall murein based on L-lysine (variation A4, type L-lysine–L-glutamic acid), synthesized long-chain cellular fatty acids of the straight-chain saturated and monounsaturated types (with C_{16 : 1}9, C_{16 : 0} and C_{18 : 1}9 predominating) and possessed a DNA G+C content of 46 mol%. Based on morphological, biochemical and chemical characteristics, the coccus-shaped organism did not conform to any presently recognized taxon. Comparative 16S rRNA gene sequencing studies confirmed the distinctiveness of the unknown coccus, with the bacterium displaying sequence divergence values of greater than 7 % with other recognized Gram-positive taxa. Treeing analysis reinforced its distinctiveness, with the unidentified organism forming a relatively long subline branching at the periphery of an rRNA gene sequence cluster which encompasses the genera Alloiococcus, Allofustis, Alkalibacterium, Atopostipes, Dolosigranulum and Marinilactibacillus. Based on phenotypic and molecular phylogenetic evidence, it is proposed that the unknown organism from tobacco be classified as a new genus and species, Atopococcus tabaci gen. nov., sp. nov. The type strain of Atopococcus tabaci is CCUG 48253^T (=CIP 108502^T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain CCUG 48253^T is AJ634917.

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