Biological Assembly 1  

 3D View: Structure

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 35.15 kDa 
• Atom Count: 2366 
• Modelled Residue Count: 297 
• Deposited Residue Count: 321 
• Unique protein chains: 1

1A87

COLICIN N

• DOI: 10.2210/pdb1A87/pdb

• Classification: BACTERIOCIN
• Organism(s): Escherichia coli K-12
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 1998-04-03 Released: 1999-04-06 
• Deposition Author(s): Vetter, I.R., Parker, M.W., Tucker, A.D., Lakey, J.H., Pattus, F., Tsernoglou, D.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.10 Å
• R-Value Free: 0.310 
• R-Value Work: 0.173 

Literature

Crystal structure of a colicin N fragment suggests a model for toxicity.

Vetter, I.R., Parker, M.W., Tucker, A.D., Lakey, J.H., Pattus, F., Tsernoglou, D.

(1998) Structure 6: 863-874

• PubMed: 9687368 
• DOI: 10.1016/s0969-2126(98)00088-4
• Primary Citation of Related Structures:  
  1A87


• PubMed Abstract: 
  

Pore-forming colicins are water-soluble bacteriocins capable of binding to and translocating through the Escherichia coli cell envelope. They then undergo a transition to a transmembrane ion channel in the cytoplasmic membrane leading to bacterial death. Colicin N is the smallest pore-forming colicin known to date (40 kDa instead of the more usual 60 kDa) and the crystal structure of its membrane receptor, the porin OmpF, is already known. Structural knowledge of colicin N is therefore important for a molecular understanding of colicin toxicity and is relevant to toxic mechanisms in general.

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Related Citations: 

• Insights Into Membrane Insertion Based on Studies of Colicins
  Vetter, I.R., Parker, M.W., Pattus, F., Tsernoglou, D.
  (1996) Protein Toxin Structure --: 5

• Characterization of the Receptor and Translocator Domains of Colicin N
  El Kouhen, R., Fierobe, H.P., Scianimanico, S., Steiert, M., Pattus, F., Pages, J.M.
  (1993) Eur J Biochem 214: 635

• Colicin N Forms Voltage-and Ph-Dependent Channels in Planar Lipid Bilayer Membranes
  Wilmsen, H.U., Pugsley, A.P., Pattus, F.
  (1990) Eur Biophys J 18: 149

• Involvement of Ompf During Reception and Translocation Steps of Colicin N Entry
  Bourdineaud, J.P., Fierobe, H.P., Lazdunski, C., Pages, J.M.
  (1990) Mol Microbiol 4: 1737

• Nucleotide Sequencing of the Structural Gene for Colicin N Reveals Homology between the Catalytic, C-Terminal Domains of Colicins a and N
  Pugsley, A.P.
  (1987) Mol Microbiol 1: 317

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Organizational Affiliation: 

European Molecular Biology Laboratory, Heidelberg, Germany. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
COLICIN N	A	321	Escherichia coli K-12	Mutation(s): 0
UniProt
Find proteins for P08083 (Escherichia coli) Explore P08083  Go to UniProtKB:  P08083

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.10 Å
• R-Value Free: 0.310 
• R-Value Work: 0.173 
• Space Group: I 4₁ 3 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 187.3	α = 90
b = 187.3	β = 90
c = 187.3	γ = 90

Software Package:

Software Name	Purpose
GROPAT	model building
TNT	refinement
XDS	data reduction
XSCALE	data scaling
GROPAT	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1998-04-03 
• Released Date: 1999-04-06 
Deposition Author(s): Vetter, I.R., Parker, M.W., Tucker, A.D., Lakey, J.H., Pattus, F., Tsernoglou, D.

Revision History  

• Version 1.0: 1999-04-06
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance