- EMDB-2321: The bacterial DnaC helicase loader is a DnaB ring breaker -
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基本情報
登録情報
データベース: EMDB / ID: EMD-2321
タイトル
The bacterial DnaC helicase loader is a DnaB ring breaker
マップデータ
Negative staining reconstruction of E. coli DnaB/DnaC complex
試料
試料: E. coli DnaB helicase bound to the DnaC loading factor
タンパク質・ペプチド: DnaB replicative helicase
タンパク質・ペプチド: DnaC helicase loading factor
キーワード
Bacterial DNA replication / DNA replication initiation / helicase / helicase loader / DnaB / DnaC / electron microscopy / SAXS / clamp loader / structure
機能・相同性
機能・相同性情報
DnaB-DnaC complex / DnaB-DnaC-Rep-PriC complex / DnaB-DnaG complex / DnaB-DnaC-DnaT-PriA-PriC complex / DnaB-DnaC-DnaT-PriA-PriB complex / DNA helicase complex / primosome complex / DNA 5'-3' helicase / DNA replication, synthesis of primer / replisome ...DnaB-DnaC complex / DnaB-DnaC-Rep-PriC complex / DnaB-DnaG complex / DnaB-DnaC-DnaT-PriA-PriC complex / DnaB-DnaC-DnaT-PriA-PriB complex / DNA helicase complex / primosome complex / DNA 5'-3' helicase / DNA replication, synthesis of primer / replisome / response to ionizing radiation / DNA strand elongation involved in DNA replication / replication fork processing / DNA replication initiation / DNA helicase activity / isomerase activity / helicase activity / 加水分解酵素; 酸無水物に作用; 酸無水物に作用・細胞または細胞小器官の運動に関与 / 5'-3' DNA helicase activity / single-stranded 3'-5' DNA helicase activity / double-stranded DNA helicase activity / forked DNA-dependent helicase activity / four-way junction helicase activity / DNA replication / ATP hydrolysis activity / DNA binding / ATP binding / identical protein binding / cytosol 類似検索 - 分子機能
DNA replication protein DnaC/insertion sequence putative ATP-binding protein / IstB-like ATP-binding protein / IstB-like ATP binding protein / DNA helicase, DnaB type / DNA helicase, DnaB type / DNA helicase, DnaB-like, N-terminal / DnaB-like helicase N terminal domain / DNA helicase, DnaB-like, N-terminal domain superfamily / DNA helicase DnaB, N-terminal/DNA primase DnaG, C-terminal / DnaB-like helicase C terminal domain ...DNA replication protein DnaC/insertion sequence putative ATP-binding protein / IstB-like ATP-binding protein / IstB-like ATP binding protein / DNA helicase, DnaB type / DNA helicase, DnaB type / DNA helicase, DnaB-like, N-terminal / DnaB-like helicase N terminal domain / DNA helicase, DnaB-like, N-terminal domain superfamily / DNA helicase DnaB, N-terminal/DNA primase DnaG, C-terminal / DnaB-like helicase C terminal domain / DNA helicase, DnaB-like, C-terminal / Superfamily 4 helicase domain profile. / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase 類似検索 - ドメイン・相同性
ジャーナル: Cell / 年: 2013 タイトル: The bacterial DnaC helicase loader is a DnaB ring breaker. 著者: Ernesto Arias-Palomo / Valerie L O'Shea / Iris V Hood / James M Berger / 要旨: Dedicated AAA+ ATPases deposit hexameric ring-shaped helicases onto DNA to promote replication in cellular organisms. To understand how loading occurs, we used electron microscopy and small angle X- ...Dedicated AAA+ ATPases deposit hexameric ring-shaped helicases onto DNA to promote replication in cellular organisms. To understand how loading occurs, we used electron microscopy and small angle X-ray scattering (SAXS) to determine the ATP-bound structure of the intact E. coli DnaB⋅DnaC helicase/loader complex. The 480 kDa dodecamer forms a three-tiered assembly, in which DnaC adopts a spiral configuration that remodels N-terminal scaffolding and C-terminal motor regions of DnaB to produce a clear break in the helicase ring. Surprisingly, DnaC's AAA+ fold is dispensable for ring remodeling because the DnaC isolated helicase-binding domain can both load DnaB onto DNA and increase the efficiency by which the helicase acts on substrates in vitro. Our data demonstrate that DnaC opens DnaB by a mechanism akin to that of polymerase clamp loaders and indicate that bacterial replicative helicases, like their eukaryotic counterparts, possess autoregulatory elements that influence how hexameric motor domains are loaded onto and unwind DNA.
全体 : E. coli DnaB helicase bound to the DnaC loading factor
全体
名称: E. coli DnaB helicase bound to the DnaC loading factor
要素
試料: E. coli DnaB helicase bound to the DnaC loading factor
タンパク質・ペプチド: DnaB replicative helicase
タンパク質・ペプチド: DnaC helicase loading factor
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超分子 #1000: E. coli DnaB helicase bound to the DnaC loading factor
超分子
名称: E. coli DnaB helicase bound to the DnaC loading factor タイプ: sample / ID: 1000 集合状態: One homohexamer of DnaB binds to one homohexamer of DnaC Number unique components: 2
The particles were selected using DoG picker as available in APPION. The contrast transfer function of the microscope for each micrograph was estimated using CTFFIND3 and phase-flipped using SPIDER. DnaBC particles were subjected to a multi-model refinement as implemented in SPARX using the 3D averages obtained from the RCT reconstructions as initial references.
CTF補正
詳細: Each micrograph
最終 再構成
想定した対称性 - 点群: C1 (非対称) / アルゴリズム: OTHER / 解像度のタイプ: BY AUTHOR / 解像度: 25.0 Å / 解像度の算出法: FSC 0.5 CUT-OFF / ソフトウェア - 名称: EMAN2, SPARX / 使用した粒子像数: 17942