ATPase Domain of G40P

Experimental Data Snapshot

  • Resolution: 2.35 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.240 

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The structure of a DnaB-family replicative helicase and its interactions with primase.

Wang, G.Klein, M.G.Tokonzaba, E.Zhang, Y.Holden, L.G.Chen, X.S.

(2008) Nat Struct Mol Biol 15: 94-100

  • DOI: https://doi.org/10.1038/nsmb1356
  • Primary Citation of Related Structures:  
    3BGW, 3BH0

  • PubMed Abstract: 

    Helicases are essential enzymes for DNA replication, a fundamental process in all living organisms. The DnaB family are hexameric replicative helicases that unwind duplex DNA and coordinate with RNA primase and other proteins at the replication fork in prokaryotes. Here, we report the full-length crystal structure of G40P, a DnaB family helicase. The hexamer complex reveals an unusual architectural feature and a new type of assembly mechanism. The hexamer has two tiers: a three-fold symmetric N-terminal tier and a six-fold symmetric C-terminal tier. Monomers with two different conformations, termed cis and trans, come together to provide a topological solution for the dual symmetry within a hexamer. Structure-guided mutational studies indicate an important role for the N-terminal tier in binding primase and regulating primase-mediated stimulation of helicase activity. This study provides insights into the structural and functional interplay between G40P helicase and DnaG primase.

  • Organizational Affiliation

    Molecular and Computational Biology, University of Southern California, 1050 Childs Way, Los Angeles, California 90089, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DNAB-LIKE REPLICATIVE HELICASE315Bacillus phage SPP1Mutation(s): 0 
Find proteins for Q38152 (Bacillus phage SPP1)
Explore Q38152 
Go to UniProtKB:  Q38152
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ38152
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.35 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.240 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 96.779α = 90
b = 96.779β = 90
c = 54.4γ = 120
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: 2007-12-25
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2024-02-21
    Changes: Data collection, Database references