1COL

REFINED STRUCTURE OF THE PORE-FORMING DOMAIN OF COLICIN A AT 2.4 ANGSTROMS RESOLUTION


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Observed: 0.180 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Refined structure of the pore-forming domain of colicin A at 2.4 A resolution.

Parker, M.W.Postma, J.P.Pattus, F.Tucker, A.D.Tsernoglou, D.

(1992) J Mol Biol 224: 639-657

  • DOI: 10.1016/0022-2836(92)90550-4
  • Primary Citation of Related Structures:  
    1COL

  • PubMed Abstract: 
  • The E1 subgroup (E1, A, B, IA, IB, K and N) of anti-bacterial toxins called colicins is known to form voltage-dependent channels in lipid bilayers. The crystal structure of the pore-forming domain of colicin A from Escherichia coli has been refined t ...

    The E1 subgroup (E1, A, B, IA, IB, K and N) of anti-bacterial toxins called colicins is known to form voltage-dependent channels in lipid bilayers. The crystal structure of the pore-forming domain of colicin A from Escherichia coli has been refined to the diffraction limit of the crystals at 2.4 A resolution by means of molecular dynamics and restrained least-squares methods to a conventional R-factor of 0.18 for all data between 6.0 and 2.4 A resolution. The polypeptide chain of 204 amino acid residues consists of ten alpha-helices organized in a three-layer structure. The helices range in length from 9 to 23 residues with an average length of 125 residues. The packing arrangement of the helices has been analysed; the packing is different from that observed in four-helix bundle proteins. The sites of 83 water molecules have been located and refined. Analysis of the structure provides insights into the mechanism of formation of a voltage-gated channel by the protein. Although it is proposed that substantial tertiary structural changes occur during membrane insertion, the secondary structural elements remain conserved. This idea has been proposed recently for a number of other protein-membrane events and thus may have more general applicability.


    Related Citations: 
    • Fluorescence Energy Transfer Distance Measurements Using Site-Directed Single Cysteine Mutants
      Lakey, J.H., Baty, D., Pattus, F.
      (1991) J Mol Biol 218: 639
    • Colicins: Prokaryotic Killer-Pores
      Pattus, F., Massotte, D., Wilmsen, H.U., Lakey, J., Tsernoglou, D., Tucker, A., Parker, M.W.
      (1990) Experientia 46: 180
    • Structure of the Membrane-Pore-Forming Fragment of Colicin A
      Parker, M.W., Pattus, F., Tucker, A.D., Tsernoglou, D.
      (1989) Nature 337: 93
    • The Membrane Channel-Forming Colicin A: Synthesis, Secretion, Structure, Action and Immunity
      Lazdunski, C.J., Baty, D., Geli, V., Cavard, D., Morlon, J., Howard, R.Lloubes.S.P., Knibiehler, M., Chartier, M., Varenne, S., Frenette, M., Dasseux, J.-L., Pattus, F.
      (1988) Biochim Biophys Acta 947: 445
    • Gating Processes of Channels Induced by Colicin A, its C-Terminal Fragment and Colicin E1 in Planar Lipid Bilayers
      Collarini, M., Amblard, G., Lazdunski, C., Pattus, F.
      (1987) Eur Biophys J 14: 147
    • Crystallization of the C-Terminal Domain of Colicin A Carrying the Voltage-Dependent Pore Activity of the Protein
      Tucker, A.D., Pattus, F., Tsernoglou, D.
      (1986) J Mol Biol 190: 133

    Organizational Affiliation

    European Molecular Biology Laboratory, Heidelberg, Germany.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
COLICIN AAB204Escherichia coliMutation(s): 0 
Gene Names: caa
Find proteins for Q47108 (Escherichia coli)
Explore Q47108 
Go to UniProtKB:  Q47108
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Observed: 0.180 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73α = 90
b = 73β = 90
c = 171.6γ = 90
Software Package:
Software NamePurpose
PROLSQrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1992-07-15
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance