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-Structure paper
| タイトル | Cryo-EM reveals structural variability of apolipoprotein A-I amyloid fibrils across organs, mutations, and clinical presentations. |
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| ジャーナル・号・ページ | Nat Commun, Vol. 17, Issue 1, Year 2026 |
| 掲載日 | 2026年4月17日 |
著者 | Binh An Nguyen / Maria Del Carmen Fernandez-Ramirez / Parker Bassett / Virender Singh / Preeti Singh / Maja Pękała / Layla Villalon / Yasmin Ahmed / Andrew Lemoff / Bret Evers / Christian Lopez / Barbara Kluve-Beckerman / Lorena Saelices / ![]() |
| PubMed 要旨 | Hereditary apolipoprotein A-I (AApoA‑I) amyloidosis is a rare systemic disease caused by the deposition of amyloid fibrils formed by apolipoprotein A‑I in multiple organs, leading to severe ...Hereditary apolipoprotein A-I (AApoA‑I) amyloidosis is a rare systemic disease caused by the deposition of amyloid fibrils formed by apolipoprotein A‑I in multiple organs, leading to severe clinical outcomes. With no available therapies or diagnostic tools, defining the structure of AApoA‑I fibrils is crucial to understanding disease mechanisms and guiding intervention. Here we use cryo-electron microscopy to analyze AApoA‑I fibrils from the heart, kidney, liver, and spleen of patients carrying G26R, L90P, and R173P mutations. G26R fibrils, regardless of organ, exhibits untwisted morphologies and cannot be resolved structurally. Conversely, L90P and R173P fibrils display a compact diabolo-shaped conformation in all organs analyzed. Their high-resolution maps enable visualization of cis-Proline 66, which may represent a potential conformational switch during fibril formation. Our findings suggest that mutation-driven polymorphism may influence organ tropism and clinical presentation. This work advances our understanding of AApoA‑I fibril assembly and provides insights toward developing targeted clinical tools. |
リンク | Nat Commun / PubMed:41991931 / PubMed Central |
| 手法 | EM (らせん対称) |
| 解像度 | 2.15 - 2.9 Å |
| 構造データ | EMDB-71896, PDB-9pvy: EMDB-71897, PDB-9pvz: EMDB-71898, PDB-9pw3: EMDB-74399, PDB-9zld: |
| 由来 |
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キーワード | PROTEIN FIBRIL / Apolipoprotein A-I / AApoAI / L90P / Amyloidosis. / R173P / cardiac / kidney / ATTR / Systemic amyloidosis / V122delta / amyloid |
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homo sapiens (ヒト)
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