- EMDB-17202: Cryo-EM density map of the C. elegans complex CMG helicase/TIM-1/... -
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データベース: EMDB / ID: EMD-17202
タイトル
Cryo-EM density map of the C. elegans complex CMG helicase/TIM-1/TIPN-1/DNSN-1 dimer on fork DNA (Multi-body Refinement MCM-2-7 NTDs)
マップデータ
Cryo-EM density map of the C. elegans complex CMG helicase/TIM-1/TIPN-1/DNSN-1 dimer on fork DNA (Multi-body Refinement MCM-2-7 NTD)
試料
複合体: In vitro reconstituted complex of Caenorhabditis elegans CMG helicase bound by TIM-1/TIPN-1 and a homodimer of DNSN-1, on a synthetic forked DNA substrate
キーワード
Replisome / DONSON / DNA replication / Initiation / REPLICATION
ジャーナル: Science / 年: 2023 タイトル: DNSN-1 recruits GINS for CMG helicase assembly during DNA replication initiation in . 著者: Yisui Xia / Remi Sonneville / Michael Jenkyn-Bedford / Liqin Ji / Constance Alabert / Ye Hong / Joseph T P Yeeles / Karim P M Labib / 要旨: Assembly of the CMG (CDC-45-MCM-2-7-GINS) helicase is the key regulated step during eukaryotic DNA replication initiation. Until now, it was unclear whether metazoa require additional factors that ...Assembly of the CMG (CDC-45-MCM-2-7-GINS) helicase is the key regulated step during eukaryotic DNA replication initiation. Until now, it was unclear whether metazoa require additional factors that are not present in yeast. In this work, we show that DNSN-1, the ortholog of human DONSON, functions during helicase assembly in a complex with MUS-101/TOPBP1. DNSN-1 is required to recruit the GINS complex to chromatin, and a cryo-electron microscopy structure indicates that DNSN-1 positions GINS on the MCM-2-7 helicase motor (comprising the six MCM-2 to MCM-7 proteins), by direct binding of DNSN-1 to GINS and MCM-3, using interfaces that we show are important for initiation and essential for viability. These findings identify DNSN-1 as a missing link in our understanding of DNA replication initiation, suggesting that initiation defects underlie the human disease syndrome that results from DONSON mutations.
全体 : In vitro reconstituted complex of Caenorhabditis elegans CMG heli...
全体
名称: In vitro reconstituted complex of Caenorhabditis elegans CMG helicase bound by TIM-1/TIPN-1 and a homodimer of DNSN-1, on a synthetic forked DNA substrate
要素
複合体: In vitro reconstituted complex of Caenorhabditis elegans CMG helicase bound by TIM-1/TIPN-1 and a homodimer of DNSN-1, on a synthetic forked DNA substrate
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超分子 #1: In vitro reconstituted complex of Caenorhabditis elegans CMG heli...
超分子
名称: In vitro reconstituted complex of Caenorhabditis elegans CMG helicase bound by TIM-1/TIPN-1 and a homodimer of DNSN-1, on a synthetic forked DNA substrate タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: #1-#16 詳細: All Caenorhabditis elegans proteins recombinantly expressed in either Saccharomyces cerevisiae (CMG helicase, TIM-1/TIPN-1) or Escherichia coli Rosetta (DE3) Competent cells (DNSN-1)