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-Structure paper
| タイトル | Structure-guided design of a synthetic bile acid that inhibits Clostridioides difficile TcdB toxin. |
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| ジャーナル・号・ページ | Nat Microbiol, Vol. 10, Issue 12, Page 3215-3228, Year 2025 |
| 掲載日 | 2025年11月18日 |
著者 | Sean Miletic / Simoun Icho / Zhijie Li / John Tam / Elizabeth C Rose / Cypress E Perkins / Ali Nakhi / Xinglin Yang / Howard C Hang / John L Rubinstein / Peter I Dosa / Casey M Theriot / Roman A Melnyk / ![]() |
| PubMed 要旨 | Intestinal bile acids are a family of host and microbiota metabolites that can directly inhibit toxin B (TcdB), the primary virulence factor of Clostridioides difficile that causes infectious ...Intestinal bile acids are a family of host and microbiota metabolites that can directly inhibit toxin B (TcdB), the primary virulence factor of Clostridioides difficile that causes infectious diarrhoea and colitis. However, the mechanism underlying the inhibition is unclear. Here we used cryogenic electron microscopy and determined the structure of TcdB bound to inhibitory bile acids cholic acid (methyl ester) and taurochenodeoxycholic acid at 2.9 Å and 3.3 Å resolution, respectively. These structures revealed that bile acids lock the C-terminal CROP domain of TcdB in a conformation that allosterically masks the two receptor-binding sites and prevents target cell recognition. Guided by the structure, we synthesized gut-restricted bile acid derivatives, designed to evade the bile acid reuptake transporters within the gut. One of the derivatives, sBA-2, was retained within the gut upon oral dosing and protected mice from toxin-induced C. difficile disease pathology. Our study uncovers the structural basis of inhibition of TcdB by bile acids and its analogues, paving the way for the development of orally deliverable therapeutics against C. difficile. |
リンク | Nat Microbiol / PubMed:41254394 |
| 手法 | EM (単粒子) |
| 解像度 | 2.87 - 3.59 Å |
| 構造データ | EMDB-70486, PDB-9ohc: EMDB-70487, PDB-9ohd: EMDB-70488, PDB-9ohe: EMDB-70489, PDB-9ohf: |
| 化合物 | ![]() ChemComp-TUD: ![]() PDB-1cba: |
| 由来 |
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キーワード | TOXIN / clostridioides difficile / Toxin B / TcdB / Bile acid / TCDCA / methyl cholate |
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clostridioides difficile (バクテリア)
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