1V74

Structure of the E. coli colicin D bound to its immunity protein ImmD


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.194 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural inhibition of the colicin D tRNase by the tRNA-mimicking immunity protein

Graille, M.Mora, L.Buckingham, R.H.Van Tilbeurgh, H.De Zamaroczy, M.

(2004) Embo J. 23: 1474-1482

  • DOI: 10.1038/sj.emboj.7600162

  • PubMed Abstract: 
  • Colicins are toxins secreted by Escherichia coli in order to kill their competitors. Colicin D is a 75 kDa protein that consists of a translocation domain, a receptor-binding domain and a cytotoxic domain, which specifically cleaves the anticodon loo ...

    Colicins are toxins secreted by Escherichia coli in order to kill their competitors. Colicin D is a 75 kDa protein that consists of a translocation domain, a receptor-binding domain and a cytotoxic domain, which specifically cleaves the anticodon loop of all four tRNA(Arg) isoacceptors, thereby inactivating protein synthesis and leading to cell death. Here we report the 2.0 A resolution crystal structure of the complex between the toxic domain and its immunity protein ImmD. Neither component shows structural homology to known RNases or their inhibitors. In contrast to other characterized colicin nuclease-Imm complexes, the colicin D active site pocket is completely blocked by ImmD, which, by bringing a negatively charged cluster in opposition to a positively charged cluster on the surface of colicin D, appears to mimic the tRNA substrate backbone. Site-directed mutations affecting either the catalytic domain or the ImmD protein have led to the identification of the residues vital for catalytic activity and for the tight colicin D/ImmD interaction that inhibits colicin D toxicity and tRNase catalytic activity.


    Organizational Affiliation

    LEBS, CNRS, UPR 9063, Gif sur Yvette, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Colicin D
A
107Escherichia coliMutation(s): 0 
Gene Names: cda
Find proteins for P17998 (Escherichia coli)
Go to UniProtKB:  P17998
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Colicin D immunity protein
B
87Escherichia coliMutation(s): 0 
Gene Names: cdi
Find proteins for P11899 (Escherichia coli)
Go to UniProtKB:  P11899
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
1PE
Query on 1PE

Download SDF File 
Download CCD File 
A
PENTAETHYLENE GLYCOL
PEG400
C10 H22 O6
JLFNLZLINWHATN-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.194 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 62.057α = 90.00
b = 62.057β = 90.00
c = 147.934γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement
SOLVEphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-03-30
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2018-01-03
    Type: Structure summary