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-Structure paper
| タイトル | Structural study on human microbiome-derived polyketide synthases that assemble genotoxic colibactin. |
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| ジャーナル・号・ページ | Structure, Vol. 33, Issue 7, Page 1208-11223.e5, Year 2025 |
| 掲載日 | 2025年7月3日 |
著者 | Minjae Kim / Jinwoo Kim / Gyu Sung Lee / Paul Dominic B Olinares / Yougant Airan / Jasmine L Chow / Jongseok Park / Yujin Jeong / Jiho Park / Brian T Chait / Seth B Herzon / Chung Sub Kim / Jin Young Kang / ![]() |
| PubMed 要旨 | Colibactin, a human microbiome-derived genotoxin, promotes colorectal cancer by damaging the host gut epithelial genomes. While colibactin is synthesized via a hybrid non-ribosomal peptide synthetase ...Colibactin, a human microbiome-derived genotoxin, promotes colorectal cancer by damaging the host gut epithelial genomes. While colibactin is synthesized via a hybrid non-ribosomal peptide synthetase (NRPS)-polyketide synthase (PKS) pathway, known as pks or clb, the structural details of its biosynthetic enzymes remain limited, hindering our understanding of its biosynthesis and clinical application. In this study, we report the cryo-EM structures of two colibactin-producing PKS enzymes, ClbC and ClbI, captured in different reaction states using a substrate-mimic crosslinker. Our structural analysis revealed the binding sites of carrier protein (CP) domains of the ClbC and ClbI on their ketosynthase (KS) domains. Further, we identified a novel NRPS-PKS docking interaction between ClbI and its upstream enzyme, ClbH, mediated by the C-terminal peptide ClbH and the dimeric interface of ClbI, establishing a 1:2 stoichiometry. These findings advance our understanding of colibactin assembly line and provide broader insights into NRPS-PKS natural product biosynthesis mechanisms. |
リンク | Structure / PubMed:40381618 |
| 手法 | EM (単粒子) |
| 解像度 | 2.91 - 3.9 Å |
| 構造データ | EMDB-38222, PDB-8xbl: EMDB-38405, PDB-8xjt: EMDB-38406, PDB-8xju: EMDB-38410, PDB-8xjy: EMDB-38411, PDB-8xjz: |
| 由来 |
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キーワード | BIOSYNTHETIC PROTEIN / colibactin / microbiome / polyketide synthase / colorectal cancer / NRPS-PKS hybrid / TRANSFERASE |
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