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-Structure paper
タイトル | Cryo-EM structure of a licensed DNA replication origin. |
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ジャーナル・号・ページ | Nat Commun, Vol. 8, Issue 1, Page 2241, Year 2017 |
掲載日 | 2017年12月21日 |
著者 | Ferdos Abid Ali / Max E Douglas / Julia Locke / Valerie E Pye / Andrea Nans / John F X Diffley / Alessandro Costa / |
PubMed 要旨 | Eukaryotic origins of replication are licensed upon loading of the MCM helicase motor onto DNA. ATP hydrolysis by MCM is required for loading and the post-catalytic MCM is an inactive double hexamer ...Eukaryotic origins of replication are licensed upon loading of the MCM helicase motor onto DNA. ATP hydrolysis by MCM is required for loading and the post-catalytic MCM is an inactive double hexamer that encircles duplex DNA. Origin firing depends on MCM engagement of Cdc45 and GINS to form the CMG holo-helicase. CMG assembly requires several steps including MCM phosphorylation by DDK. To understand origin activation, here we have determined the cryo-EM structures of DNA-bound MCM, either unmodified or phosphorylated, and visualize a phospho-dependent MCM element likely important for Cdc45 recruitment. MCM pore loops touch both the Watson and Crick strands, constraining duplex DNA in a bent configuration. By comparing our new MCM-DNA structure with the structure of CMG-DNA, we suggest how the conformational transition from the loaded, post-catalytic MCM to CMG might promote DNA untwisting and melting at the onset of replication. |
リンク | Nat Commun / PubMed:29269875 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 4.26 - 7.5 Å |
構造データ | EMDB-3833: EMDB-3834: EMDB-3960: Cryo-EM Structure of a Licensed DNA Replication Origin EMDB-4164: |
化合物 | ChemComp-ADP: |
由来 |
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キーワード | HYDROLASE / AAA+ Helicase / Nucleoprotein complex / DNA replication / Double hexamer |