3BGW

The Structure Of A DnaB-Like Replicative Helicase And Its Interactions With Primase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.91 Å
  • R-Value Free: 0.349 
  • R-Value Work: 0.338 
  • R-Value Observed: 0.339 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

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: 10.1038/nsmb1356
  • Structures With Same Primary Citation

  • 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 ...

    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.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DNAB-Like Replicative Helicase
A, B, C, D, E, F
444Bacillus phage SPP1Mutation(s): 0 
Gene Names: G40P
Find proteins for Q38152 (Bacillus phage SPP1)
Go to UniProtKB:  Q38152
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.91 Å
  • R-Value Free: 0.349 
  • R-Value Work: 0.338 
  • R-Value Observed: 0.339 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 114.634α = 90
b = 184.411β = 90
c = 184.47γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling
SOLVEphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-12-25
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance