2IY9

Crystal structure of the A-subunit of the AB5 toxin from E. coli


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.200 

Starting Model: experimental
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This is version 1.4 of the entry. See complete history


Literature

Ab5 Subtilase Cytotoxin Inactivates the Endoplasmic Reticulum Chaperone Bip

Paton, A.W.Beddoe, T.Thorpe, C.M.Whisstock, J.C.Wilce, M.C.J.Rossjohn, J.Talbot, U.M.Paton, J.C.

(2006) Nature 443: 548

  • DOI: https://doi.org/10.1038/nature05124
  • Primary Citation of Related Structures:  
    2IY9

  • PubMed Abstract: 

    AB5 toxins are produced by pathogenic bacteria and consist of enzymatic A subunits that corrupt essential eukaryotic cell functions, and pentameric B subunits that mediate uptake into the target cell. AB5 toxins include the Shiga, cholera and pertussis toxins and a recently discovered fourth family, subtilase cytotoxin, which is produced by certain Shiga toxigenic strains of Escherichia coli. Here we show that the extreme cytotoxicity of this toxin for eukaryotic cells is due to a specific single-site cleavage of the essential endoplasmic reticulum chaperone BiP/GRP78. The A subunit is a subtilase-like serine protease; structural studies revealed an unusually deep active-site cleft, which accounts for its exquisite substrate specificity. A single amino-acid substitution in the BiP target site prevented cleavage, and co-expression of this resistant protein protected transfected cells against the toxin. BiP is a master regulator of endoplasmic reticulum function, and its cleavage by subtilase cytotoxin represents a previously unknown trigger for cell death.


  • Organizational Affiliation

    School of Molecular and Biomedical Science, University of Adelaide, South Australia 5005, Australia. adrienne.paton@adelaide.edu.au


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
SUBA347Escherichia coliMutation(s): 0 
EC: 3.4.21
UniProt
Find proteins for Q6EZC2 (Escherichia coli)
Explore Q6EZC2 
Go to UniProtKB:  Q6EZC2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ6EZC2
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.200 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 44.967α = 90
b = 78.987β = 90
c = 95.782γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-10-04
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-12-13
    Changes: Data collection, Database references, Other, Refinement description
  • Version 1.4: 2024-10-16
    Changes: Structure summary