Crystal Form B1

Experimental Data Snapshot

  • Resolution: 3.70 Å
  • R-Value Free: 0.322 
  • R-Value Work: 0.309 
  • R-Value Observed: 0.310 

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This is version 1.2 of the entry. See complete history


Structure of hexameric DnaB helicase and its complex with a domain of DnaG primase

Bailey, S.Eliason, W.K.Steitz, T.A.

(2007) Science 318: 459-463

  • DOI: https://doi.org/10.1126/science.1147353
  • Primary Citation of Related Structures:  
    2R6A, 2R6C, 2R6D, 2R6E

  • PubMed Abstract: 

    The complex between the DnaB helicase and the DnaG primase unwinds duplex DNA at the eubacterial replication fork and synthesizes the Okazaki RNA primers. The crystal structures of hexameric DnaB and its complex with the helicase binding domain (HBD) of DnaG reveal that within the hexamer the two domains of DnaB pack with strikingly different symmetries to form a distinct two-layered ring structure. Each of three bound HBDs stabilizes the DnaB hexamer in a conformation that may increase its processivity. Three positive, conserved electrostatic patches on the N-terminal domain of DnaB may also serve as a binding site for DNA and thereby guide the DNA to a DnaG active site.

  • Organizational Affiliation

    Department of Molecular Biophysics and Biochemistry and Howard Hughes Medical Institute, Yale University, New Haven, CT 06520, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Replicative helicase
A, B, C, D, E
A, B, C, D, E, F
454N/AMutation(s): 0 
Gene Names: DnaBdnaB
Find proteins for Q9X4C9 (Geobacillus stearothermophilus)
Explore Q9X4C9 
Go to UniProtKB:  Q9X4C9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9X4C9
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.70 Å
  • R-Value Free: 0.322 
  • R-Value Work: 0.309 
  • R-Value Observed: 0.310 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 371.26α = 90
b = 110.295β = 90
c = 112.606γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-06-10
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Refinement description, Version format compliance
  • Version 1.2: 2024-02-21
    Changes: Data collection, Database references, Refinement description