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Lactosphaera gen. nov., a New Genus of Lactic Acid Bacteria, and Transfer of Ruminococcus pasteurii Schink 1984 to Lactosphaera pasteurii comb. nov.

¹Fakultät für Biologie, Universität Konstanz, D-78434 Konstanz, Germany
³Lehrstuhl für Mikrobiologie, Technische Universität München, D-80333 Munich, Germany
⁴Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, D-38124 Braunschweig, Germany
²Department of Biological Sciences, University of Waikato, Hamilton, New Zealand

^* Corresponding author. Present address: Max-Planck-Institut für Terrestrische Mikrobiologie, D-35043 Marburg, Germany. Fax: (49) 6421 161470.

ABSTRACT

The phylogenetic position and physiology of strain KoTa2^T (T = type strain), which was previously classified as a Ruminococcus pasteurii strain, were studied. A determination of the 16S ribosomal DNA sequence of this taxon revealed its position within the radiation of the gram-positive lactic acid bacteria having low DNA G+C contents and that it is closely related to the genus Carnobacterium. L-Lactic acid was produced from glucose by a fructose-1,6-bisphosphate-activated lactate dehydrogenase, and oxygen tolerance was observed, characteristics which are consistent with assignment to this group. On the basis of its phenotypic characteristics and unique signature nucleotides, we propose that strain KoTa2 (= DSM 2381 = ATCC 35945) should be transferred to a new genus, Lactosphaera gen. nov., as the type strain of the species Lactosphaera pasteurii comb. nov.

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