Aquifex aeolicus replicative helicase (DnaB) complexed with ADP, at 3.3 resolution
Components
Replicative DNA helicase
Keywords
REPLICATION / RecA-type helicase / Replicative DNA helicase / ATP binding / DNA-binding
Function / homology
Function and homology information
primosome complex / DNA replication, synthesis of RNA primer / DNA duplex unwinding / DNA unwinding involved in DNA replication / DNA helicase activity / DNA helicase / ATP hydrolysis activity / DNA binding / ATP binding / metal ion binding / cytosol Similarity search - Function
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. / P-loop containing nucleotide triphosphate hydrolases / ATPases associated with a variety of cellular activities ...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. / P-loop containing nucleotide triphosphate hydrolases / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase / Rossmann fold / 3-Layer(aba) Sandwich / Alpha Beta Similarity search - Domain/homology
Journal: Mol Cell / Year: 2013 Title: Nucleotide and partner-protein control of bacterial replicative helicase structure and function. Authors: Melania S Strycharska / Ernesto Arias-Palomo / Artem Y Lyubimov / Jan P Erzberger / Valerie L O'Shea / Carlos J Bustamante / James M Berger / Abstract: Cellular replication forks are powered by ring-shaped, hexameric helicases that encircle and unwind DNA. To better understand the molecular mechanisms and control of these enzymes, we used multiple ...Cellular replication forks are powered by ring-shaped, hexameric helicases that encircle and unwind DNA. To better understand the molecular mechanisms and control of these enzymes, we used multiple methods to investigate the bacterial replicative helicase, DnaB. A 3.3 Å crystal structure of Aquifex aeolicus DnaB, complexed with nucleotide, reveals a newly discovered conformational state for this motor protein. Electron microscopy and small angle X-ray scattering studies confirm the state seen crystallographically, showing that the DnaB ATPase domains and an associated N-terminal collar transition between two physical states in a nucleotide-dependent manner. Mutant helicases locked in either collar state are active but display different capacities to support critical activities such as duplex translocation and primase-dependent RNA synthesis. Our findings establish the DnaB collar as an autoregulatory hub that controls the ability of the helicase to transition between different functional states in response to both nucleotide and replication initiation/elongation factors.
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