4O9X

Crystal Structure of TcdB2-TccC3


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.17 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.193 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Mechanism of Tc toxin action revealed in molecular detail.

Meusch, D.Gatsogiannis, C.Efremov, R.G.Lang, A.E.Hofnagel, O.Vetter, I.R.Aktories, K.Raunser, S.

(2014) Nature 508: 61-65

  • DOI: 10.1038/nature13015
  • Primary Citation of Related Structures:  
    4O9X, 4O9Y

  • PubMed Abstract: 
  • Tripartite Tc toxin complexes of bacterial pathogens perforate the host membrane and translocate toxic enzymes into the host cell, including in humans. The underlying mechanism is complex but poorly understood. Here we report the first, to our knowledge, high-resolution structures of a TcA subunit in its prepore and pore state and of a complete 1 ...

    Tripartite Tc toxin complexes of bacterial pathogens perforate the host membrane and translocate toxic enzymes into the host cell, including in humans. The underlying mechanism is complex but poorly understood. Here we report the first, to our knowledge, high-resolution structures of a TcA subunit in its prepore and pore state and of a complete 1.7 megadalton Tc complex. The structures reveal that, in addition to a translocation channel, TcA forms four receptor-binding sites and a neuraminidase-like region, which are important for its host specificity. pH-induced opening of the shell releases an entropic spring that drives the injection of the TcA channel into the membrane. Binding of TcB/TcC to TcA opens a gate formed by a six-bladed β-propeller and results in a continuous protein translocation channel, whose architecture and properties suggest a novel mode of protein unfolding and translocation. Our results allow us to understand key steps of infections involving Tc toxins at the molecular level.


    Organizational Affiliation

    1] Department of Physical Biochemistry, Max Planck Institute of Molecular Physiology, 44227 Dortmund, Germany [2] Institute of Chemistry and Biochemistry, Freie Universität Berlin, Thielallee 63, 14195 Berlin, Germany.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
TcdB2, TccC3A2191Photorhabdus luminescensMutation(s): 0 
Gene Names: tcdB2TccC3
UniProt
Find proteins for Q8GF99 (Photorhabdus luminescens)
Explore Q8GF99 
Go to UniProtKB:  Q8GF99
Find proteins for Q8GF97 (Photorhabdus luminescens)
Explore Q8GF97 
Go to UniProtKB:  Q8GF97
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsQ8GF99Q8GF97
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.17 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.193 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 232.36α = 90
b = 232.36β = 90
c = 143.57γ = 120
Software Package:
Software NamePurpose
XSCALEdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
XDSdata scaling
XDSdata reduction
PHENIXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-02-26
    Type: Initial release
  • Version 1.1: 2017-08-23
    Changes: Refinement description, Source and taxonomy