Crystal Structure of TcdB2-TccC3-Cdc42

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.320 
  • R-Value Work: 0.287 

wwPDB Validation   3D Report Full Report

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Towards the application of Tc toxins as a universal protein translocation system.

Roderer, D.Schubert, E.Sitsel, O.Raunser, S.

(2019) Nat Commun 10: 5263-5263

  • DOI: https://doi.org/10.1038/s41467-019-13253-8
  • Primary Citation of Related Structures:  
    6SUP, 6SUQ

  • PubMed Abstract: 

    Tc toxins are bacterial protein complexes that inject cytotoxic enzymes into target cells using a syringe-like mechanism. Tc toxins are composed of a membrane translocator and a cocoon that encapsulates a toxic enzyme. The toxic enzyme varies between Tc toxins from different species and is not conserved. Here, we investigate whether the toxic enzyme can be replaced by other small proteins of different origin and properties, namely Cdc42, herpes simplex virus ICP47, Arabidopsis thaliana iLOV, Escherichia coli DHFR, Ras-binding domain of CRAF kinase, and TEV protease. Using a combination of electron microscopy, X-ray crystallography and in vitro translocation assays, we demonstrate that it is possible to turn Tc toxins into customizable molecular syringes for delivering proteins of interest across membranes. We also infer the guidelines that protein cargos must obey in terms of size, charge, and fold in order to apply Tc toxins as a universal protein translocation system.

  • Organizational Affiliation

    Department of Structural Biochemistry, Max Planck Institute of Molecular Physiology, Otto-Hahn-Str. 11, 44227, Dortmund, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
TcdB2,TccC3,Cell division control protein 42 homolog2,128Photorhabdus luminescensHomo sapiensMutation(s): 0 
Gene Names: tcdB2TccC3CDC42
UniProt & NIH Common Fund Data Resources
Find proteins for Q8GF99 (Photorhabdus luminescens)
Explore Q8GF99 
Go to UniProtKB:  Q8GF99
Find proteins for Q8GF97 (Photorhabdus luminescens)
Explore Q8GF97 
Go to UniProtKB:  Q8GF97
Find proteins for P60953 (Homo sapiens)
Explore P60953 
Go to UniProtKB:  P60953
PHAROS:  P60953
GTEx:  ENSG00000070831 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsQ8GF97Q8GF99P60953
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.320 
  • R-Value Work: 0.287 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 96.35α = 90
b = 156.55β = 90
c = 179.46γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

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: 2019-12-04
    Type: Initial release
  • Version 1.1: 2024-01-24
    Changes: Advisory, Data collection, Database references, Refinement description