- EMDB-0287: Cryo-EM structure of S. cerevisiae Polymerase epsilon deltacat mutant -
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基本情報
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データベース: EMDB / ID: EMD-0287
タイトル
Cryo-EM structure of S. cerevisiae Polymerase epsilon deltacat mutant
マップデータ
Pol epsilon deltacat
試料
複合体: Cryo-EM structure of S. cerevisiae Polymerase epsilon deltacat (C-Pol2+C-Dpb2)
タンパク質・ペプチド: DNA polymerase epsilon subunit B
タンパク質・ペプチド: DNA polymerase epsilon catalytic subunit A
リガンド: ZINC ION
キーワード
Polymerase epsilon / DNA replication / enzyme / DNA polymerase / DNA BINDING PROTEIN
機能・相同性
機能・相同性情報
DNA-templated DNA replication maintenance of fidelity / gene conversion / DNA replication initiation / epsilon DNA polymerase complex / SUMO binding / nucleotide-excision repair, DNA gap filling / Activation of the pre-replicative complex / DNA replication proofreading / Termination of translesion DNA synthesis / single-stranded DNA 3'-5' DNA exonuclease activity ...DNA-templated DNA replication maintenance of fidelity / gene conversion / DNA replication initiation / epsilon DNA polymerase complex / SUMO binding / nucleotide-excision repair, DNA gap filling / Activation of the pre-replicative complex / DNA replication proofreading / Termination of translesion DNA synthesis / single-stranded DNA 3'-5' DNA exonuclease activity / mitotic DNA replication checkpoint signaling / mitotic intra-S DNA damage checkpoint signaling / 加水分解酵素; エステル加水分解酵素; 5'-リン酸モノエステル産生エンドデオキシリボヌクレアーゼ / mitotic sister chromatid cohesion / leading strand elongation / nuclear replication fork / Dual incision in TC-NER / error-prone translesion synthesis / base-excision repair, gap-filling / replication fork / base-excision repair / double-strand break repair via nonhomologous end joining / DNA-templated DNA replication / double-strand break repair / mitotic cell cycle / single-stranded DNA binding / 4 iron, 4 sulfur cluster binding / double-stranded DNA binding / DNA-directed DNA polymerase / DNA-directed DNA polymerase activity / nucleotide binding / mRNA binding / DNA binding / zinc ion binding / nucleus / cytoplasm 類似検索 - 分子機能
DNA polymerase epsilon, subunit B / : / : / DNA polymerase epsilon catalytic subunit A, thumb domain / Zinc finger domain of DNA polymerase-epsilon / DNA polymerase epsilon, catalytic subunit A, C-terminal / DNA polymerase epsilon catalytic subunit / Domain of unknown function (DUF1744) / DUF1744 / DNA polymerase alpha/delta/epsilon, subunit B ...DNA polymerase epsilon, subunit B / : / : / DNA polymerase epsilon catalytic subunit A, thumb domain / Zinc finger domain of DNA polymerase-epsilon / DNA polymerase epsilon, catalytic subunit A, C-terminal / DNA polymerase epsilon catalytic subunit / Domain of unknown function (DUF1744) / DUF1744 / DNA polymerase alpha/delta/epsilon, subunit B / DNA polymerase alpha/epsilon subunit B / DNA polymerase family B, thumb domain / DNA polymerase family B, exonuclease domain / DNA-directed DNA polymerase, family B, exonuclease domain / DNA polymerase, palm domain superfamily / DNA polymerase type-B family / DNA-directed DNA polymerase, family B / Ribonuclease H superfamily / Ribonuclease H-like superfamily / DNA/RNA polymerase superfamily 類似検索 - ドメイン・相同性
DNA polymerase epsilon catalytic subunit A / DNA polymerase epsilon subunit B 類似検索 - 構成要素
ジャーナル: Nat Commun / 年: 2018 タイトル: Structure of DNA-CMG-Pol epsilon elucidates the roles of the non-catalytic polymerase modules in the eukaryotic replisome. 著者: Panchali Goswami / Ferdos Abid Ali / Max E Douglas / Julia Locke / Andrew Purkiss / Agnieszka Janska / Patrik Eickhoff / Anne Early / Andrea Nans / Alan M C Cheung / John F X Diffley / Alessandro Costa / 要旨: Eukaryotic origin firing depends on assembly of the Cdc45-MCM-GINS (CMG) helicase. A key step is the recruitment of GINS that requires the leading-strand polymerase Pol epsilon, composed of Pol2, ...Eukaryotic origin firing depends on assembly of the Cdc45-MCM-GINS (CMG) helicase. A key step is the recruitment of GINS that requires the leading-strand polymerase Pol epsilon, composed of Pol2, Dpb2, Dpb3, Dpb4. While a truncation of the catalytic N-terminal Pol2 supports cell division, Dpb2 and C-terminal Pol2 (C-Pol2) are essential for viability. Dpb2 and C-Pol2 are non-catalytic modules, shown or predicted to be related to an exonuclease and DNA polymerase, respectively. Here, we present the cryo-EM structure of the isolated C-Pol2/Dpb2 heterodimer, revealing that C-Pol2 contains a DNA polymerase fold. We also present the structure of CMG/C-Pol2/Dpb2 on a DNA fork, and find that polymerase binding changes both the helicase structure and fork-junction engagement. Inter-subunit contacts that keep the helicase-polymerase complex together explain several cellular phenotypes. At least some of these contacts are preserved during Pol epsilon-dependent CMG assembly on path to origin firing, as observed with DNA replication reconstituted in vitro.