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-Structure paper
| タイトル | Cryo-EM of wild-type and mutant PMEL amyloid cores reveals structural mechanism of pigment dispersion syndrome. |
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| ジャーナル・号・ページ | Nat Commun, Vol. 16, Issue 1, Page 5411, Year 2025 |
| 掲載日 | 2025年7月1日 |
著者 | Haruaki Yanagisawa / Harumi Arai / Tony Wang / Hideyuki Miyazawa / Masahide Kikkawa / Toshiyuki Oda / ![]() |
| PubMed 要旨 | PMEL amyloids serve as essential scaffolds for melanin deposition in melanosomes, playing a crucial role in pigmentation. Despite their importance, the high-resolution structure of PMEL amyloids has ...PMEL amyloids serve as essential scaffolds for melanin deposition in melanosomes, playing a crucial role in pigmentation. Despite their importance, the high-resolution structure of PMEL amyloids has remained unresolved. Using cryo-electron microscopy, we determine near-atomic resolution structures of wild-type PMEL amyloid core, revealing two distinct polymorphic forms with structural features. We further investigate the pathogenic G175S mutation associated with pigment dispersion syndrome (PDS). Structural analysis reveales that G175S introduces an additional hydrogen bond, stabilizing an alternative fibril conformation. In vitro, the G175S mutant exhibits a fourfold increase in polymerization efficiency compared to the wild type. In cells, G175S expression resultes in a twofold increase in intracellular amyloid content and a ~70% increase in extracellular amyloids, without altering melanosome morphology or number. These results indicate that the G175S mutation enhances amyloidogenesis within melanosomes, elevating amyloid load and potentially contributing to PDS pathophysiology. This study provides molecular insights into PMEL amyloid formation, highlighting its structural diversity and dysregulation in pigmentation disorders. |
リンク | Nat Commun / PubMed:40595665 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 1.79 - 1.94 Å |
| 構造データ | EMDB-61782, PDB-9jst: EMDB-61783, PDB-9jsu: EMDB-61784, PDB-9jsv: EMDB-61785, PDB-9jsw: EMDB-61786, PDB-9jsx: |
| 由来 |
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キーワード | STRUCTURAL PROTEIN / melanosome / melanoma / pigment / melanin / amyloid / glaucoma |
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homo sapiens (ヒト)
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