International Journal of Systematic and Evolutionary Microbiology, Vol 50, 251-258, Copyright © 2000 by International Union of Microbiological Societies

ARTICLES

Lactobacillus mucosae sp. nov., a new species with in vitro mucus-binding activity isolated from pig intestine

S Roos, F Karner, L Axelsson and H Jonsson
Department of Microbiology, Swedish University of Agricultural Sciences, Box 7025, SE-75007 Uppsala, Sweden

A new Lactobacillus species from pig small intestine has been identified. In an attempt to isolate Lactobacillus reuteri strains carrying the putative colonization-factor gene (mub, for mucus binding) a mub-derived gene probe was used to screen pig intestinal material. A number of isolates were obtained and primary characterization showed that they were Gram-positive, catalase-negative, non-spore-forming, non-motile rods. Growth occurred at 45 degrees C but not at 15 degrees C and the DNA G+C content was 46 mol%. Cell wall analysis together with DNA--DNA hybridization and analysis of the 16S rRNA sequence revealed that the new isolates represent a previously undescribed Lactobacillus species closely related to L. reuteri, Lactobacillus fermentum and Lactobacillus pontis. The name Lactobacillus mucosae is proposed for this species and the type strain is S32(T).

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