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-Structure paper
| タイトル | Structures of the Insecticidal Toxin Complex Subunit XptA2 Highlight Roles for Flexible Domains. |
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| ジャーナル・号・ページ | Int J Mol Sci, Vol. 24, Issue 17, Year 2023 |
| 掲載日 | 2023年8月25日 |
著者 | Cole L Martin / David W Chester / Christopher D Radka / Lurong Pan / Zhengrong Yang / Rachel C Hart / Elad M Binshtein / Zhao Wang / Lisa Nagy / Lawrence J DeLucas / Stephen G Aller / ![]() |
| PubMed 要旨 | The Toxin Complex (Tc) superfamily consists of toxin translocases that contribute to the targeting, delivery, and cytotoxicity of certain pathogenic Gram-negative bacteria. Membrane receptor ...The Toxin Complex (Tc) superfamily consists of toxin translocases that contribute to the targeting, delivery, and cytotoxicity of certain pathogenic Gram-negative bacteria. Membrane receptor targeting is driven by the A-subunit (TcA), which comprises IgG-like receptor binding domains (RBDs) at the surface. To better understand XptA2, an insect specific TcA secreted by the symbiont from the intestine of entomopathogenic nematodes, we determined structures by X-ray crystallography and cryo-EM. Contrary to a previous report, XptA2 is pentameric. RBD-B exhibits an indentation from crystal packing that indicates loose association with the shell and a hotspot for possible receptor binding or a trigger for conformational dynamics. A two-fragment XptA2 lacking an intact linker achieved the folded pre-pore state like wild type (wt), revealing no requirement of the linker for protein folding. The linker is disordered in all structures, and we propose it plays a role in dynamics downstream of the initial pre-pore state. |
リンク | Int J Mol Sci / PubMed:37686027 / PubMed Central |
| 手法 | EM (単粒子) / X線回折 |
| 解像度 | 3.1 Å |
| 構造データ | EMDB-41503, PDB-8tqe: ![]() PDB-8tv0: |
| 由来 |
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キーワード | TOXIN / TcA / Insecticide / Translocase |
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xenorhabdus nematophila (バクテリア)
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