4PTA

Structure of MDR initiator


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6003 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.225 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Mechanism of staphylococcal multiresistance plasmid replication origin assembly by the RepA protein.

Schumacher, M.A.Tonthat, N.K.Kwong, S.M.Chinnam, N.B.Liu, M.A.Skurray, R.A.Firth, N.

(2014) Proc.Natl.Acad.Sci.USA 111: 9121-9126

  • DOI: 10.1073/pnas.1406065111
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The staphylococcal multiresistance plasmids are key contributors to the alarming rise in bacterial multidrug resistance. A conserved replication initiator, RepA, encoded on these plasmids is essential for their propagation. RepA proteins consist of f ...

    The staphylococcal multiresistance plasmids are key contributors to the alarming rise in bacterial multidrug resistance. A conserved replication initiator, RepA, encoded on these plasmids is essential for their propagation. RepA proteins consist of flexibly linked N-terminal (NTD) and C-terminal (CTD) domains. Despite their essential role in replication, the molecular basis for RepA function is unknown. Here we describe a complete structural and functional dissection of RepA proteins. Unexpectedly, both the RepA NTD and CTD show similarity to the corresponding domains of the bacterial primosome protein, DnaD. Although the RepA and DnaD NTD both contain winged helix-turn-helices, the DnaD NTD self-assembles into large scaffolds whereas the tetrameric RepA NTD binds DNA iterons using a newly described DNA binding mode. Strikingly, structural and atomic force microscopy data reveal that the NTD tetramer mediates DNA bridging, suggesting a molecular mechanism for origin handcuffing. Finally, data show that the RepA CTD interacts with the host DnaG primase, which binds the replicative helicase. Thus, these combined data reveal the molecular mechanism by which RepA mediates the specific replicon assembly of staphylococcal multiresistant plasmids.


    Organizational Affiliation

    School of Biological Sciences, University of Sydney, Sydney, NSW 2006, Australia.,Department of Biochemistry, Duke University Medical Center, Durham, NC 27710; and.,Department of Biochemistry, Duke University Medical Center, Durham, NC 27710; and maria.schumacher@duke.edu.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Replication initiator protein
D
131Staphylococcus aureus (strain USA300)Mutation(s): 0 
Gene Names: repA
Find proteins for A0A0H2XIV8 (Staphylococcus aureus (strain USA300))
Go to UniProtKB:  A0A0H2XIV8
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6003 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.225 
  • Space Group: I 41 2 2
Unit Cell:
Length (Å)Angle (°)
a = 101.460α = 90.00
b = 101.460β = 90.00
c = 62.780γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
ADSCdata collection
SOLVEphasing
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2014-03-10 
  • Released Date: 2014-06-25 
  • Deposition Author(s): Schumacher, M.A.

Revision History 

  • Version 1.0: 2014-06-25
    Type: Initial release
  • Version 1.1: 2014-07-23
    Type: Database references