Microbially conjugated bile acids differentially affect the lifecycle and pathogenesis of Clostridioides difficile

Serine-conjugated microbially conjugated bile acids enhance Clostridioides difficile growth, spore production, and toxin activity in inhibitory bile acid conditions, while tryptophan MCBAs increase inhibition.

• Why it matters: Gut microbiota bile acid transformations are linked to colonization resistance against CDI, but how newly formed microbially conjugated bile acids mechanistically shape C. difficile lifecycle and pathogenesis remains unclear.
• What they did: The study synthesized 36 MCBAs using nine amino acids conjugated to CA, DCA, CDCA, and LCA, then tested effects on outgrowth, membrane integrity, sporulation, and toxin activity across lifecycle stages.
• The result: BSH-mediated amidation of bile acid sterol cores produces amino-acid-dependent changes in inhibitory effects, identifying specific MCBAs as promising therapeutic targets for CDI.

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