2PNH

Escherichia coli PriB E39A variant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.247 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

A hand-off mechanism for primosome assembly in replication restart.

Lopper, M.Boonsombat, R.Sandler, S.J.Keck, J.L.

(2007) Mol.Cell 26: 781-793

  • DOI: 10.1016/j.molcel.2007.05.012

  • PubMed Abstract: 
  • Collapsed DNA replication forks must be reactivated through origin-independent reloading of the replication machinery (replisome) to ensure complete duplication of cellular genomes. In E. coli, the PriA-dependent pathway is the major replication rest ...

    Collapsed DNA replication forks must be reactivated through origin-independent reloading of the replication machinery (replisome) to ensure complete duplication of cellular genomes. In E. coli, the PriA-dependent pathway is the major replication restart mechanism and requires primosome proteins PriA, PriB, and DnaT for replisome reloading. However, the molecular mechanisms that regulate origin-independent replisome loading are not fully understood. Here, we demonstrate that assembly of primosome protein complexes represents a key regulatory mechanism, as inherently weak PriA-PriB and PriB-DnaT interactions are strongly stimulated by single-stranded DNA. Furthermore, the binding site on PriB for single-stranded DNA partially overlaps the binding sites for PriA and DnaT, suggesting a dynamic primosome assembly process in which single-stranded DNA is handed off from one primosome protein to another as a repaired replication fork is reactivated. This model helps explain how origin-independent initiation of DNA replication is restricted to repaired replication forks, preventing overreplication of the genome.


    Organizational Affiliation

    Department of Biomolecular Chemistry, University of Wisconsin School of Medicine and Public Health, 550 Medical Sciences Center, 1300 University Avenue, Madison, WI 53706, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Primosomal replication protein n
A, B
107Escherichia coli (strain K12)Mutation(s): 1 
Gene Names: priB
Find proteins for P07013 (Escherichia coli (strain K12))
Go to UniProtKB:  P07013
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.247 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 49.978α = 90.00
b = 60.685β = 90.00
c = 66.273γ = 90.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
HKL-2000data scaling
HKL-2000data reduction
DENZOdata reduction
SCALEPACKdata scaling
HKL-2000data collection
AMoREphasing
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-08-07
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Derived calculations, Refinement description, Source and taxonomy, Version format compliance
  • Version 1.2: 2017-10-18
    Type: Refinement description