6H6G

Crystal Structure of TcdB2-TccC3 without hypervariable C-terminal region


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.217 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Tc toxin activation requires unfolding and refolding of a beta-propeller.

Gatsogiannis, C.Merino, F.Roderer, D.Balchin, D.Schubert, E.Kuhlee, A.Hayer-Hartl, M.Raunser, S.

(2018) Nature 563: 209-213

  • DOI: 10.1038/s41586-018-0556-6
  • Primary Citation of Related Structures:  
    6H6E, 6H6F, 6H6G

  • PubMed Abstract: 
  • Tc toxins secrete toxic enzymes into host cells using a unique syringe-like injection mechanism. They are composed of three subunits, TcA, TcB and TcC. TcA forms the translocation channel and the TcB-TcC heterodimer functions as a cocoon that shields the toxic enzyme ...

    Tc toxins secrete toxic enzymes into host cells using a unique syringe-like injection mechanism. They are composed of three subunits, TcA, TcB and TcC. TcA forms the translocation channel and the TcB-TcC heterodimer functions as a cocoon that shields the toxic enzyme. Binding of the cocoon to the channel triggers opening of the cocoon and translocation of the toxic enzyme into the channel. Here we show in atomic detail how the assembly of the three components activates the toxin. We find that part of the cocoon completely unfolds and refolds into an alternative conformation upon binding. The presence of the toxic enzyme inside the cocoon is essential for its subnanomolar binding affinity for the TcA subunit. The enzyme passes through a narrow negatively charged constriction site inside the cocoon, probably acting as an extruder that releases the unfolded protein with its C terminus first into the translocation channel.


    Organizational Affiliation

    Department of Structural Biochemistry, Max Planck Institute of Molecular Physiology, Dortmund, Germany. stefan.raunser@mpi-dortmund.mpg.de.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
TcdB2,TccC3A2157Photorhabdus 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: 3.00 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.216 
  • R-Value Observed: 0.217 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 231.33α = 90
b = 231.33β = 90
c = 141.97γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing

Structure Validation

View Full Validation Report




Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
European Research CouncilGermany615984

Revision History  (Full details and data files)

  • Version 1.0: 2018-10-03
    Type: Initial release
  • Version 1.1: 2018-11-14
    Changes: Data collection, Database references