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-Structure paper
| タイトル | A method for cryo-EM analysis of eukaryotic nucleosomes reconstituted in bacterial cells. |
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| ジャーナル・号・ページ | iScience, Vol. 29, Issue 1, Page 114453, Year 2026 |
| 掲載日 | 2026年1月16日 |
著者 | Cheng-Han Ho / Yuki Kobayashi / Mitsuo Ogasawara / Yoshimasa Takizawa / Hitoshi Kurumizaka / ![]() |
| PubMed 要旨 | Conventional methods for preparing nucleosomes are time-consuming and technically demanding. In the present study, we extended the approach of generating nucleosomes in by the co-expression of all ...Conventional methods for preparing nucleosomes are time-consuming and technically demanding. In the present study, we extended the approach of generating nucleosomes in by the co-expression of all four histones, allowing nucleosomes to be assembled in cells. The bacterially reconstituted nucleosomes can be readily prepared from the cells and directly subjected to cryo-EM single particle analysis. Using this method, we obtained a 2.56 Å nucleosome structure that is highly similar to a previously reported nucleosome crystal structure, validating the use of nucleosomes formed in for cryo-EM analysis. Unexpectedly, we also discovered a non-canonical nucleosome structure, in which two hexasomes are closely packed. This system provides a robust and efficient platform for structural studies of nucleosomes and nucleosome variants, and may facilitate the discovery of chromatin architectures. |
リンク | iScience / PubMed:41541688 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 4.94 Å |
| 構造データ | EMDB-65716, PDB-9w74: |
| 由来 |
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キーワード | GENE REGULATION / Chromatin / Nucleosome / Hexasome / Subnucleosome / Histone / DNA |
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