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-Structure paper
| タイトル | Cryo-EM structures of the BAF-Lamin A/C complex bound to nucleosomes. |
|---|---|
| ジャーナル・号・ページ | Nat Commun, Vol. 16, Issue 1, Page 1495, Year 2025 |
| 掲載日 | 2025年2月10日 |
著者 | Naoki Horikoshi / Ryosuke Miyake / Chizuru Sogawa-Fujiwara / Mitsuo Ogasawara / Yoshimasa Takizawa / Hitoshi Kurumizaka / ![]() |
| PubMed 要旨 | Barrier-to-autointegration factor (BAF) associates with mitotic chromosomes and promotes nuclear envelope assembly by recruiting proteins, such as Lamins, required for the reconstruction of the ...Barrier-to-autointegration factor (BAF) associates with mitotic chromosomes and promotes nuclear envelope assembly by recruiting proteins, such as Lamins, required for the reconstruction of the nuclear envelope and lamina. BAF also mediates chromatin anchoring to the nuclear lamina via Lamin A/C. However, the mechanism by which BAF and Lamin A/C bind chromatin and affect the chromatin organization remains elusive. Here we report the cryo-electron microscopy structures of BAF-Lamin A/C-nucleosome complexes. We find that the BAF dimer complexed with the Lamin A/C IgF domain occupies the nucleosomal dyad position, forming a tripartite nucleosomal DNA binding structure. We also show that the Lamin A/C Lys486 and His506 residues, which are reportedly mutated in lipodystrophy patients, directly contact the DNA at the nucleosomal dyad. Excess BAF-Lamin A/C complexes symmetrically bind other nucleosomal DNA sites and connect two BAF-Lamin A/C-nucleosome complexes. Although the linker histone H1 competes with BAF-Lamin A/C binding at the nucleosomal dyad region, the two BAF-Lamin A/C molecules still bridge two nucleosomes. These findings provide insights into the mechanism by which BAF, Lamin A/C, and/or histone H1 bind nucleosomes and influence chromatin organization within the nucleus. |
リンク | Nat Commun / PubMed:39929866 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.82 - 7.14 Å |
| 構造データ | EMDB-61231, PDB-9j8m: EMDB-61232, PDB-9j8n: EMDB-61233, PDB-9j8o: |
| 由来 |
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キーワード | NUCLEAR PROTEIN / Nucleosome / DNA binding proteins / Nuclear lamina |
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