Bile salt hydrolase activity and resistance to toxicity of conjugated bile salts are unrelated properties in lactobacilli

Article Abstract:

Bile salt hydrolase activity is not solely responsible for protecting lactobacilli from the toxic effects of conjugated bile salts in the human gastrointestinal tract. Of 49 strains of Lactobacillus spp. tested, 26 strains had more than one bile salt hydrolase but only 15 were resistant to bile salt toxicity.

Health aspects, Microbial enzymes, Bile acids

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Genes encoding bile salt hydrolases and conjugated bile salt transporters in Lactobacillus johnsonii 100-100 and other Lactobacillus species

Article Abstract:

Research has been conducted on the Lactobacillus johnsonii strain which expresses antigenically conjugated bile salt hydrolases. The characterization of the loci within the genome encoding this capacity has been carried out and the results are reported.

United States, Statistical Data Included, Physiological aspects, Genetic aspects, Gene expression, Genomes, Microbiological research, Salts, Bile

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Growth phase, cellular hydrophobicity, and adhesion in vitro of lactobacillicolonizing the keratinizing gastric epithelium in the mouse

Article Abstract:

The hydrophobicities of lactobacilli either able or unable to colonize the mouse keratinizing gastric epithilium were determined. Lactobacillus fermentum 100-33, a non-colonizer, was strongly hydrophilic, while L. fermentum RI, a colonizer, was hydrophobic. Derivatives of RI were hydrophobic in varying degrees, but were less hydrophobic during thestationary phase than in the exponential phase. Cell adhesion studies showed that the ability of lactobacilli to colonize the surface of keratinocytes may involve both hydrophilic and hydrophobic molecules.

Bacteria, Bacterial adhesion, Cell membranes, Plasma membranes

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