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Comparative Sequence Analyses of the Genes Coding for 16S rRNA of Lactobacillus casei-Related Taxa

KATSUMI MORI^1,*, KOJI YAMAZAKI², TOMOHARU ISHIYAMA^1,, MASAHIRO KATSUMATA^1,, KAYO KOBAYASHI^1,, YUJI KAWAI², NORIO INOUE² and HARUO SHINANO²

¹Systematic Microbiology Laboratory, National Food Research Institute, Ministry of Agriculture, Forestry and Fisheries, 2-1-2 Kannondai, Tsukuba, Ibaraki 305, Japan
²Faculty of Fisheries, Hokkaido University, Hakodate, Hokkaido 041, Japan

^* Corresponding author.

ABSTRACT

The primary structures of the 16S rRNA genes of the type strains of Lactobacillus casei and related taxa were determined by PCR DNA-sequencing methods. The sequences of Lactobacillus casei, Lactobacillus zeae, Lactobacillus paracasei, and Lactobacillus rhamnosus were different. The K_nuc values ranged from 0.0040 to 0.0126. On the basis of the K_nuc values and the levels of DNA-DNA relatedness among the strains of these species, the L. casei-related taxa should be classified in the following three species: L. zeae, which includes the type strains of L. zeae and L. casei; a species that includes the strains of L. paracasei and L. casei ATCC 334; and L. rhamnosus.

Present address: Hagoromo Foods Co., Ltd., Shimizu-shi, Japan.

Present address: Ishiyama Miso-Shoyu Co., Ltd., Niigata-shi, Japan.

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