Biological Assembly 1  

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Global Symmetry: Cyclic - C6  (3D View)
Global Stoichiometry: Homo 6-mer - A6 

Biological assembly 1 assigned by authors and generated by PQS (software)

Macromolecule Content

• Total Structure Weight: 293469.75 
• Atom Count: 19756 
• Residue Count: 2622 
• Unique protein chains: 1

1E9R

Bacterial conjugative coupling protein TrwBdeltaN70. Trigonal form in complex with sulphate.

• DOI: 10.2210/pdb1E9R/pdb

• Classification: COUPLING PROTEIN
• Organism(s): Escherichia coli
• Expression System: Escherichia coli


• Deposited: 2000-10-26 Released: 2001-02-06 
• Deposition Author(s): Gomis-Rueth, F.X., Moncalian, G., Cabezon, E., de la Cruz, F., Coll, M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.4 Å
• R-Value Free: 0.248 
• R-Value Work: 0.210 

Literature

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

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

(2001) Nature 409: 637

• PubMed: 11214325 
• DOI: 10.1038/35054586
• Primary Citation of Related Structures:  
  1GL7, 1GL6, 1GKI, 1E9S


• 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. 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.

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Organizational Affiliation: 

Institut de Biologia Molecular de Barcelona, CSIC, Spain.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
CONJUGAL TRANSFER PROTEIN TRWB	A, B, D, E, F, G	437	Escherichia coli	Mutation(s): 0  Gene Names: trwB
Find proteins for Q04230 (Escherichia coli) Go to UniProtKB:  Q04230

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
SO4	A, B, D, E, F, G	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.4 Å
• R-Value Free: 0.248 
• R-Value Work: 0.210 
• Space Group: P 3₁ 2 1

Unit Cell:

Length (Å)	Angle (°)
a = 151.300	α = 90.00
b = 151.300	β = 90.00
c = 258.200	γ = 120.00

Software Package:

Software Name	Purpose
DM	phasing
SCALA	data scaling
SHELX	phasing
CNS	refinement
MLPHARE	phasing
MOSFLM	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2000-10-26 
• Released Date: 2001-02-06 
• Deposition Author(s): Gomis-Rueth, F.X., Moncalian, G., Cabezon, E., de la Cruz, F., Coll, M.

Revision History 

• Version 1.0: 2001-02-06
  Type: Initial release
• Version 1.1: 2011-05-08
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance