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 

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:  

  • 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 knowle ...

    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].




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TcdB2, TccC3
A
2191Photorhabdus luminescensMutation(s): 0 
Gene Names: TccC3, tcdB2
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Adventitious Membrane Proteins: Alpha-helical Pore-forming Toxins.
Protein: 
Tc Toxin, TcA prepore (TcdA1) subunit
Find proteins for Q8GF97 (Photorhabdus luminescens)
Go to UniProtKB:  Q8GF97
Find proteins for Q8GF99 (Photorhabdus luminescens)
Go to UniProtKB:  Q8GF99
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HG
Query on HG

Download SDF File 
Download CCD File 
A
MERCURY (II) ION
Hg
BQPIGGFYSBELGY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.17 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.192 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 232.360α = 90.00
b = 232.360β = 90.00
c = 143.570γ = 120.00
Software Package:
Software NamePurpose
XDSdata scaling
XSCALEdata scaling
PHENIXphasing
PHENIXrefinement
PDB_EXTRACTdata extraction
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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