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-Structure paper
タイトル | Stabilization of the hexasome intermediate during histone exchange by yeast SWR1 complex. |
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ジャーナル・号・ページ | Mol Cell, Vol. 84, Issue 20, Page 3871-33884.e9, Year 2024 |
掲載日 | 2024年10月17日 |
著者 | Adam S B Jalal / Paul Girvan / Eugene Y D Chua / Lexin Liu / Shijie Wang / Elizabeth A McCormack / Michael T Skehan / Carol L Knight / David S Rueda / Dale B Wigley / |
PubMed 要旨 | The yeast SWR1 complex catalyzes the exchange of histone H2A/H2B dimers in nucleosomes with Htz1/H2B dimers. We use cryoelectron microscopy to determine the structure of an enzyme-bound hexasome ...The yeast SWR1 complex catalyzes the exchange of histone H2A/H2B dimers in nucleosomes with Htz1/H2B dimers. We use cryoelectron microscopy to determine the structure of an enzyme-bound hexasome intermediate in the reaction pathway of histone exchange, in which an H2A/H2B dimer has been extracted from a nucleosome prior to the insertion of a dimer comprising Htz1/H2B. The structure reveals a key role for the Swc5 subunit in stabilizing the unwrapping of DNA from the histone core of the hexasome. By engineering a crosslink between an Htz1/H2B dimer and its chaperone protein Chz1, we show that this blocks histone exchange by SWR1 but allows the incoming chaperone-dimer complex to insert into the hexasome. We use this reagent to trap an SWR1/hexasome complex with an incoming Htz1/H2B dimer that shows how the reaction progresses to the next step. Taken together the structures reveal insights into the mechanism of histone exchange by SWR1 complex. |
リンク | Mol Cell / PubMed:39226902 |
手法 | EM (単粒子) |
解像度 | 3.5 - 4.4 Å |
構造データ | EMDB-18764, PDB-8qyv: EMDB-18769, PDB-8qz0: EMDB-50297, PDB-9fbw: |
化合物 | ChemComp-ADP: ChemComp-BEF: ChemComp-MG: ChemComp-ZN: |
由来 |
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キーワード | DNA BINDING PROTEIN / Chromatin remodelling complex / hexasome / hexasome-dimer complex |