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-Structure paper
| タイトル | Complete structures of the YenTc holotoxin prepore and pore reveal the evolutionary basis for chitinase incorporation into ABC toxins. |
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| ジャーナル・号・ページ | Nat Commun, Vol. 16, Issue 1, Page 11121, Year 2025 |
| 掲載日 | 2025年12月15日 |
著者 | Yu Shang Low / Solace G Roche / Nadezhda A Aleksandrova / Gabriel Foley / Jason Kk Low / Joseph K Box / Tristan I Croll / Irene R Chassagnon / J Shaun Lott / Evelyne Deplazes / Mikael Bodén / Mark Rh Hurst / Sarah J Piper / Michael J Landsberg / ![]() |
| PubMed 要旨 | ABC toxins are toxin-translocating, pore-forming proteins found in a wide range of insecticidal bacteria and some mammalian pathogens. The Yersinia entomopahaga toxin complex (YenTc) belongs to a ...ABC toxins are toxin-translocating, pore-forming proteins found in a wide range of insecticidal bacteria and some mammalian pathogens. The Yersinia entomopahaga toxin complex (YenTc) belongs to a distinct subclass of ABC toxins, defined by a divergent molecular architecture. Structural details that define their mechanism of action remain to be elucidated. Here we determine structures of the YenTc holotoxin assembly in both prepore and pore-forming configurations using cryo-EM in conjunction with Alphafold2-assisted structural modelling of flexible domains. We define the structural mechanism via which enzymatically-active chitinase subunits are incorporated, and show using phylogenetic analyses that this subclass-defining feature has evolved relatively recently. Our structures point to the existence of distinct conformational states in YenTc, which may distinguish it from other structurally-characterised ABC toxins, or represent states on a shared mechanistic trajectory. Thus, our findings enhance our understanding of the structural diversity that defines distinct ABC toxin subclasses. |
リンク | Nat Commun / PubMed:41397958 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 4.6 - 6.43 Å |
| 構造データ | EMDB-45190, PDB-9c4k: EMDB-45422, PDB-9cbc: ![]() EMDB-45423: Yersinia entomophaga toxin complex TcA subunit |
| 由来 |
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キーワード | TOXIN / pore-forming / insecticidal / chitinases |
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yersinia entomophaga (バクテリア)
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