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-Structure paper
| タイトル | Cryo-EM reveals open and closed Asgard chromatin assemblies. |
|---|---|
| ジャーナル・号・ページ | Mol Cell, Vol. 85, Issue 22, Page 4152-44165.e5, Year 2025 |
| 掲載日 | 2025年11月20日 |
著者 | Harsh M Ranawat / Marc K Cajili / Natalia Lopez-Barbosa / Thomas Quail / Remus T Dame / Svetlana O Dodonova / ![]() |
| PubMed 要旨 | Asgards are the closest archaeal relatives of eukaryotes, representing an important step in chromatin evolution. However, their chromatin organization has remained enigmatic until now. In this study, ...Asgards are the closest archaeal relatives of eukaryotes, representing an important step in chromatin evolution. However, their chromatin organization has remained enigmatic until now. In this study, we present the first structures of Asgard chromatin assemblies formed by the Hodarchaeal histone HHoB. Our high-resolution cryo-electron microscopy (cryo-EM) structures reveal that this Asgard histone assembles into compact "closed" and into extended "open" hypernucleosomes. Thus, the closed hypernucleosome conformation is conserved across archaeal lineages, while the open conformation resembles a eukaryotic H3-H4 octasome and likely represents an Asgard-specific innovation. Moreover, we show that Mg²⁺ ions influence Asgard chromatin conformation, suggesting a regulatory role. Overall, our study provides the first structure-based model of Asgard chromatin organization, expanding our understanding of chromatin architecture in an evolutionary context. |
リンク | Mol Cell / PubMed:41161312 |
| 手法 | EM (単粒子) |
| 解像度 | 2.6 - 10.5 Å |
| 構造データ | EMDB-53386, PDB-9qv5: EMDB-53387, PDB-9qv6: EMDB-53388, PDB-9qv7: ![]() EMDB-53389: Asgard HHoB open hypernucleosome ![]() EMDB-53390: Asgard HHoB nucleosome map in the open state in 0mM MgCl2 |
| 由来 |
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キーワード | DNA BINDING PROTEIN / Archaea / Asgard / chromatin / nucleosome / histone / DNA |
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candidatus heimdallarchaeota archaeon lc_3 (古細菌)
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