2I88

Crystal structure of the Channel-forming Domain of Colicin E1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.176 

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This is version 1.3 of the entry. See complete history


Literature

A mechanism for toxin insertion into membranes is suggested by the crystal structure of the channel-forming domain of colicin E1

Elkins, P.Bunker, A.Cramer, W.A.Stauffacher, C.V.

(1997) Structure 5: 443-458

  • DOI: 10.1016/s0969-2126(97)00200-1
  • Primary Citation of Related Structures:  
    2I88

  • PubMed Abstract: 
  • Channel-forming colicins, including colicin E1, are a sub-family of bacteriocins. The toxic action of colicin E1 is derived from its ability to form a voltage-gated channel, which causes depolarization of the cytoplasmic membrane of sensitive Escherichia coli cells ...

    Channel-forming colicins, including colicin E1, are a sub-family of bacteriocins. The toxic action of colicin E1 is derived from its ability to form a voltage-gated channel, which causes depolarization of the cytoplasmic membrane of sensitive Escherichia coli cells. In this process, the toxin-like colicin E1 molecule must undergo a substantial structural transition from a soluble state, in which it binds the target cell, to a membrane-bound state. Details of the structural changes that accompany this conversion may be directly applicable to other channel-forming toxins, as well as to the mechanism by which proteins insert into or cross membranes.


    Organizational Affiliation

    Protein Engineering, Department Genentech, Inc. 460 Pt. San Bruno Blvd, South San Francisco, CA 94080, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Colicin-E1A191Escherichia coliMutation(s): 0 
Gene Names: cea
Find proteins for P02978 (Escherichia coli)
Explore P02978 
Go to UniProtKB:  P02978
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.176 
  • Space Group: I 4
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 87.46α = 90
b = 87.46β = 90
c = 59.1γ = 90
Software Package:
Software NamePurpose
CNSrefinement
PDB_EXTRACTdata extraction
CrystalCleardata collection
DENZOdata reduction
CCP4data scaling
CCP4phasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-09-26
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-01-24
    Changes: Advisory, Structure summary