Journal
JOURNAL OF BACTERIOLOGY
Volume 192, Issue 19, Pages 4983-4990Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/JB.00610-10
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Funding
- National Institutes of Health [N01 AI30050, K12 GM074869-02]
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To cause disease, Clostridium difficile spores must germinate in the host gastrointestinal tract. Germination is initiated upon exposure to glycine and certain bile acids, e.g., taurocholate. Chenodeoxycholate, another bile acid, inhibits taurocholate-mediated germination. By applying Michaelis-Menten kinetic analysis to C. difficile spore germination, we found that chenodeoxycholate is a competitive inhibitor of taurocholate-mediated germination and appears to interact with the spores with greater apparent affinity than does taurocholate. We also report that several analogs of chenodeoxycholate are even more effective inhibitors. Some of these compounds resist 7 alpha-dehydroxylation by Clostridium scindens, a core member of the normal human colonic microbiota, suggesting that they are more stable than chenodeoxycholate in the colonic environment.
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