- EMDB-4142: Cryo-EM structure of the E. coli replicative DNA polymerase-clamp... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-4142
タイトル
Cryo-EM structure of the E. coli replicative DNA polymerase-clamp-exonuclase-theta complex bound to DNA in the editing mode
マップデータ
Related to EMD-4142 Local alignment after signal subtraction of the beta subunit
試料
複合体: DNA polyerase III alpha, beta, epsilon, theta complex with mismatched DNA duplex
複合体: DNA polyerase III alpha, epsilon, theta complex with mismatched DNA duplex
機能・相同性
機能・相同性情報
DNA polymerase III, core complex / Hda-beta clamp complex / bacterial-type DNA replication / replication inhibiting complex / DNA polymerase III complex / DNA replication proofreading / lagging strand elongation / replisome / regulation of DNA-templated DNA replication initiation / exonuclease activity ...DNA polymerase III, core complex / Hda-beta clamp complex / bacterial-type DNA replication / replication inhibiting complex / DNA polymerase III complex / DNA replication proofreading / lagging strand elongation / replisome / regulation of DNA-templated DNA replication initiation / exonuclease activity / DNA strand elongation involved in DNA replication / leading strand elongation / error-prone translesion synthesis / 3'-5' exonuclease activity / negative regulation of DNA-templated DNA replication initiation / DNA-templated DNA replication / DNA-directed DNA polymerase / DNA-directed DNA polymerase activity / DNA damage response / protein homodimerization activity / DNA binding / metal ion binding / identical protein binding / cytosol / cytoplasm 類似検索 - 分子機能
DNA polymerase III-theta, bacterial / DNA polymerase III-theta superfamily / DNA polymerase III, theta subunit / : / : / DNA polymerase III subunit alpha, C-terminal domain / DNA polymerase 3, epsilon subunit / DNA polymerase III epsilon subunit, exonuclease domain / Bacterial DNA polymerase III alpha subunit, thumb domain / DNA polymerase III, alpha subunit ...DNA polymerase III-theta, bacterial / DNA polymerase III-theta superfamily / DNA polymerase III, theta subunit / : / : / DNA polymerase III subunit alpha, C-terminal domain / DNA polymerase 3, epsilon subunit / DNA polymerase III epsilon subunit, exonuclease domain / Bacterial DNA polymerase III alpha subunit, thumb domain / DNA polymerase III, alpha subunit / Bacterial DNA polymerase III, alpha subunit, NTPase domain / DNA polymerase, helix-hairpin-helix motif / DNA polymerase III alpha subunit finger domain / Bacterial DNA polymerase III alpha NTPase domain / Helix-hairpin-helix motif / Bacterial DNA polymerase III alpha subunit finger domain / PHP domain / PHP domain / Polymerase/histidinol phosphatase, N-terminal / DNA polymerase alpha chain like domain / Polymerase/histidinol phosphatase-like / Exonuclease / DNA polymerase III, beta sliding clamp / DNA polymerase III, beta sliding clamp, N-terminal / DNA polymerase III, beta sliding clamp, C-terminal / DNA polymerase III, beta sliding clamp, central / DNA polymerase III beta subunit, N-terminal domain / DNA polymerase III beta subunit, central domain / DNA polymerase III beta subunit, C-terminal domain / DNA polymerase III beta subunit / Exonuclease, RNase T/DNA polymerase III / EXOIII / OB-fold nucleic acid binding domain, AA-tRNA synthetase-type / OB-fold nucleic acid binding domain / : / Ribonuclease H superfamily / Ribonuclease H-like superfamily / Nucleic acid-binding, OB-fold 類似検索 - ドメイン・相同性
DNA polymerase III subunit epsilon / Beta sliding clamp / DNA polymerase III subunit theta / DNA polymerase III subunit alpha 類似検索 - 構成要素
ジャーナル: Nat Struct Mol Biol / 年: 2017 タイトル: Self-correcting mismatches during high-fidelity DNA replication. 著者: Rafael Fernandez-Leiro / Julian Conrad / Ji-Chun Yang / Stefan M V Freund / Sjors H W Scheres / Meindert H Lamers / 要旨: Faithful DNA replication is essential to all forms of life and depends on the action of 3'-5' exonucleases that remove misincorporated nucleotides from the newly synthesized strand. However, how the ...Faithful DNA replication is essential to all forms of life and depends on the action of 3'-5' exonucleases that remove misincorporated nucleotides from the newly synthesized strand. However, how the DNA is transferred from the polymerase to the exonuclease active site is not known. Here we present the cryo-EM structure of the editing mode of the catalytic core of the Escherichia coli replisome, revealing a dramatic distortion of the DNA whereby the polymerase thumb domain acts as a wedge that separates the two DNA strands. Importantly, NMR analysis of the DNA substrate shows that the presence of a mismatch increases the fraying of the DNA, thus enabling it to reach the exonuclease active site. Therefore the mismatch corrects itself, whereas the exonuclease subunit plays a passive role. Hence, our work provides unique insights into high-fidelity replication and establishes a new paradigm for the correction of misincorporated nucleotides.
超分子 #2: DNA polyerase III alpha, epsilon, theta complex with mismatched D...
超分子
名称: DNA polyerase III alpha, epsilon, theta complex with mismatched DNA duplex タイプ: complex / ID: 2 / 親要素: 1 / 含まれる分子: #1, #3-#6 詳細: Map obtained after signal subtraction of the beta subunit and alignment of the remaining parts. Final reconstruction obtained with non-subtracted images and angles from local alignment
凍結剤: ETHANE / チャンバー内湿度: 100 % / チャンバー内温度: 277 K / 装置: FEI VITROBOT MARK IV 詳細: Prior to sample preparation 0.1 volumes of 0.05% Tween 20 were added to the sample 3 microliters were pipetted onto the grid and blotted for 4 seconds.
詳細
Sample was run over a gel filtration column prior to vitrification
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電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
温度
最低: 80.0 K / 最高: 80.0 K
特殊光学系
エネルギーフィルター - 名称: GIF Quantum エネルギーフィルター - エネルギー下限: 0 eV エネルギーフィルター - エネルギー上限: 20 eV
The cryo-EM structure of the PolIIIalpha-clamp-exonuclease complex in the polymerase mode (PDB code: 5FKW)1 was used as a starting model, and the NMR structure of theta bound to the ? catalytic domain (PDB code: 2XY8)13 was used to place ? into the cryo-EM map. The model was manually adjusted in Coot35 and geometry of the protein optimized in Refmac536 using DNA-specific restraints generated in LibG36