1GL6

Plasmid coupling protein TrwB in complex with the non-hydrolysable GTP analogue GDPNP

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.214 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history. 

Literature

The Bacterial Conjugation Protein Trwb Resembles Ring Helicases and F1-ATPase

Gomis-Ruth, F.X., Moncalian, G., Perez-Luque, R., Gonzalez, A., Cabezon, E., De La Cruz, F., Coll, M.

(2001) Nature 409: 637

  • DOI: 10.1038/35054586
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    • The transfer of DNA across membranes and between cells is a central biological process; however, its molecular mechanism remains unknown. In prokaryotes, trans-membrane passage by bacterial conjugation, is the main route for horizontal gene transfer. ...

    The transfer of DNA across membranes and between cells is a central biological process; however, its molecular mechanism remains unknown. In prokaryotes, trans-membrane passage by bacterial conjugation, is the main route for horizontal gene transfer. It is the means for rapid acquisition of new genetic information, including antibiotic resistance by pathogens. Trans-kingdom gene transfer from bacteria to plants or fungi and even bacterial sporulation are special cases of conjugation. An integral membrane DNA-binding protein, called TrwB in the Escherichia coli R388 conjugative system, is essential for the conjugation process. This large multimeric protein is responsible for recruiting the relaxosome DNA-protein complex, and participates in the transfer of a single DNA strand during cell mating. Here we report the three-dimensional structure of a soluble variant of TrwB. The molecule consists of two domains: a nucleotide-binding domain of alpha/beta topology, reminiscent of RecA and DNA ring helicases, and an all-alpha domain. Six equivalent protein monomers associate to form an almost spherical quaternary structure that is strikingly similar to F1-ATPase. A central channel, 20 A in width, traverses the hexamer.

    Related Citations: 
    • Conjugative Plasmid Protein Trwb, an Integral Membrane Type Iv Secretion System Coupling Protein. Detailed Structural Features and Mapping of the Active Site Cleft.
      Gomis-Ruth, F.X.,Moncalian, G.,De La Cruz, F.,Coll, M.
      (2002) J.Biol.Chem. 277: 7556

    Organizational Affiliation: 

    Institut de Biologia Molecular de Barcelona, CSIC, Spain.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ATPASE
A, B, D, E, F, G
436Escherichia coliMutation(s): 0 
Gene Names: trwB
Find proteins for Q04230 (Escherichia coli)
Go to UniProtKB:  Q04230
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EPE
Query on EPE
Download SDF File 
Download CCD File 
E
4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID
HEPES
C8 H18 N2 O4 S
JKMHFZQWWAIEOD-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL
Download SDF File 
Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
GNP
Query on GNP
Download SDF File 
Download CCD File 
A, B, D, E, F, G
PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER
C10 H17 N6 O13 P3
UQABYHGXWYXDTK-UUOKFMHZSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.214 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 151.600α = 90.00
b = 151.600β = 90.00
c = 252.000γ = 120.00
Software Package:
Software NamePurpose
CNSrefinement
SCALAdata scaling
MOSFLMdata reduction
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots


View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-05-16
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance