6RWB

Cryo-EM structure of Yersinia pseudotuberculosis TcaA-TcaB


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.25 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Common architecture of Tc toxins from human and insect pathogenic bacteria.

Leidreiter, F.Roderer, D.Meusch, D.Gatsogiannis, C.Benz, R.Raunser, S.

(2019) Sci Adv 5: eaax6497-eaax6497

  • DOI: https://doi.org/10.1126/sciadv.aax6497
  • Primary Citation of Related Structures:  
    6RW6, 6RW8, 6RW9, 6RWA, 6RWB

  • PubMed Abstract: 

    Tc toxins use a syringe-like mechanism to penetrate the membrane and translocate toxic enzymes into the host cytosol. They are composed of three components: TcA, TcB, and TcC. Low-resolution structures of TcAs from different bacteria suggest a considerable difference in their architecture and possibly in their mechanism of action. Here, we present high-resolution structures of five TcAs from insect and human pathogens, which show a similar overall composition and domain organization. Essential structural features, including a trefoil protein knot, are present in all TcAs, suggesting a common mechanism of action. All TcAs form functional pores and can be combined with TcB-TcC subunits from other species to form active chimeric holotoxins. We identified a conserved ionic pair that stabilizes the shell, likely operating as a strong latch that only springs open after destabilization of other regions. Our results provide new insights into the architecture and mechanism of the Tc toxin family.


  • Organizational Affiliation

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


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Toxin,Toxin complex subunit TcaB,Putative toxin subunit,Putative toxin subunit,Toxin,Toxin complex subunit TcaB,Putative toxin subunit,Putative toxin subunit,Toxin,Toxin complex subunit TcaB,Putative toxin subunit,Putative toxin subunit,Toxin,Toxin complex subunit TcaB,Putative toxin subunit,Putative toxin subunit
A, B, C, D, E
2,030Yersinia pseudotuberculosisMutation(s): 0 
Gene Names: EGX47_10580YPP3681NCTC8580_04191
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.25 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTPHENIX
RECONSTRUCTIONSPHIRE

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
European Research CouncilGermany615984

Revision History  (Full details and data files)

  • Version 1.0: 2019-10-23
    Type: Initial release
  • Version 1.1: 2019-11-06
    Changes: Data collection, Database references
  • Version 1.2: 2024-05-22
    Changes: Data collection, Database references, Refinement description