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 replication, synthesis of primer / replisome / DNA duplex unwinding ...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 replication, synthesis of primer / replisome / DNA duplex unwinding / DNA strand elongation involved in DNA replication / response to ionizing radiation / replication fork processing / DNA unwinding involved in DNA replication / DNA replication initiation / DNA helicase activity / helicase activity / DNA replication / DNA helicase / hydrolase activity / 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-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 ...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-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
Replicative DNA helicase / DNA replication protein dnaC / Replicative DNA helicase / DNA replication protein DnaC 類似検索 - 構成要素
ジャーナル: Mol Cell / 年: 2019 タイトル: Physical Basis for the Loading of a Bacterial Replicative Helicase onto DNA. 著者: Ernesto Arias-Palomo / Neha Puri / Valerie L O'Shea Murray / Qianyun Yan / James M Berger / 要旨: In cells, dedicated AAA+ ATPases deposit hexameric, ring-shaped helicases onto DNA to initiate chromosomal replication. To better understand the mechanisms by which helicase loading can occur, we ...In cells, dedicated AAA+ ATPases deposit hexameric, ring-shaped helicases onto DNA to initiate chromosomal replication. To better understand the mechanisms by which helicase loading can occur, we used cryo-EM to determine sub-4-Å-resolution structures of the E. coli DnaB⋅DnaC helicase⋅loader complex with nucleotide in pre- and post-DNA engagement states. In the absence of DNA, six DnaC protomers latch onto and crack open a DnaB hexamer using an extended N-terminal domain, stabilizing this conformation through nucleotide-dependent ATPase interactions. Upon binding DNA, DnaC hydrolyzes ATP, allowing DnaB to isomerize into a topologically closed, pre-translocation state competent to bind primase. Our data show how DnaC opens the DnaB ring and represses the helicase prior to DNA binding and how DnaC ATPase activity is reciprocally regulated by DnaB and DNA. Comparative analyses reveal how the helicase loading mechanism of DnaC parallels and diverges from homologous AAA+ systems involved in DNA replication and transposition.