Solution structure of the Escherichia coli TolA C-terminal domain

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 1000 
  • Conformers Submitted: 16 
  • Selection Criteria: structures with the lowest energy 

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This is version 1.3 of the entry. See complete history


Solution structure of the E.coli TolA C-terminal domain reveals conformational changes upon binding to the phage g3p N-terminal domain.

Deprez, C.Lloubes, R.Gavioli, M.Marion, D.Guerlesquin, F.Blanchard, L.

(2005) J Mol Biol 346: 1047-1057

  • DOI: https://doi.org/10.1016/j.jmb.2004.12.028
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The Tol-Pal system of Escherichia coli is a macromolecular complex located in the cell envelope. It is involved in maintaining the integrity of the outer membrane and is required for the uptake of two different types of macromolecules, which are bacteriotoxins (colicins) and DNA of filamentous bacteriophages. The TolA protein plays a central role in these import mechanisms. Its C-terminal domain (TolAIII) is involved in the translocation step via direct interaction with the N-terminal domain of colicins and the N-terminal domain of the phage minor coat gene 3 protein (g3pN1). Extreme behaviours of TolAIII have been previously observed, since the structure of TolAIII either remained unaffected or adopted disordered conformation upon binding to different pore-forming colicins. Here, we have solved the 3D structure of free TolAIII by heteronuclear NMR spectroscopy and compared it to the crystal structure of TolAIII bound to g3pN1 in order to study the effect of g3pN1 on the tertiary structure of TolAIII. Backbone 1H, 15N and 13C resonances of the g3pN1-bound TolAIII were also assigned and used to superimpose the solution structure of free TolAIII on the crystal structure of the g3pN1-TolAIII fusion protein. This allowed us to track conformational changes of TolAIII upon binding. While the global fold of free TolAIII is mainly identical to that of g3pN1-bound TolAIII, shift of secondary structures does occur. Thus, TolAIII, which interacts also in vivo with Pal and TolB, is able to adapt its conformation upon binding to various partners. Possible models for protein binding mechanisms are discussed to explain this so-far unobserved behaviour of TolAIII.

  • Organizational Affiliation

    Laboratoire de Resonance Magnetique Nucleaire, Institut de Biologie Structurale Jean-Pierre Ebel (CNRS-CEA-UJF), UMR 5075, 41 rue Jules Horowitz, 38027 Grenoble cedex 1, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
TolA protein106Escherichia coliMutation(s): 0 
Find proteins for P19934 (Escherichia coli (strain K12))
Explore P19934 
Go to UniProtKB:  P19934
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UniProt GroupP19934
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 1000 
  • Conformers Submitted: 16 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-02-15
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2022-03-02
    Changes: Data collection, Database references, Derived calculations