X-Ray Crystal Structure of the passenger domain of Plasmid encoded toxin, an Autrotansporter Enterotoxin from enteroaggregative Escherichia coli (EAEC)

Experimental Data Snapshot

  • Resolution: 2.30 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.222 

Starting Model: experimental
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X-ray crystal structure of the passenger domain of plasmid encoded toxin(Pet), an autotransporter enterotoxin from enteroaggregative Escherichia coli (EAEC).

Domingo Meza-Aguilar, J.Fromme, P.Torres-Larios, A.Mendoza-Hernandez, G.Hernandez-Chinas, U.Arreguin-Espinosa de Los Monteros, R.A.Eslava Campos, C.A.Fromme, R.

(2014) Biochem Biophys Res Commun 445: 439-444

  • DOI: https://doi.org/10.1016/j.bbrc.2014.02.016
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Autotransporters (ATs) represent a superfamily of proteins produced by a variety of pathogenic bacteria, which include the pathogenic groups of Escherichia coli (E. coli) associated with gastrointestinal and urinary tract infections. We present the first X-ray structure of the passenger domain from the Plasmid-encoded toxin (Pet) a 100 kDa protein at 2.3 Å resolution which is a cause of acute diarrhea in both developing and industrialized countries. Pet is a cytoskeleton-altering toxin that induces loss of actin stress fibers. While Pet (pdb code: 4OM9) shows only a sequence identity of 50% compared to the closest related protein sequence, extracellular serine protease plasmid (EspP) the structural features of both proteins are conserved. A closer structural look reveals that Pet contains a β-pleaded sheet at the sequence region of residues 181-190, the corresponding structural domain in EspP consists of a coiled loop. Secondary, the Pet passenger domain features a more pronounced beta sheet between residues 135 and 143 compared to the structure of EspP.

  • Organizational Affiliation

    Departamento de Salud Pública Facultad de Medicina UNAM, Ciudad Universitaria Coyoacán 04510, D.F., Mexico; Laboratorio de Patogenicidad Bacteriana, Unidad de Hemato Oncología e Investigación, Hospital Infantil de México Federico Gómez 06720, D.F., Mexico.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Serine protease pet966Escherichia coli 042Mutation(s): 0 
Gene Names: EC042_pAA035pet
EC: 3.4.21
Find proteins for O68900 (Escherichia coli O44:H18 (strain 042 / EAEC))
Explore O68900 
Go to UniProtKB:  O68900
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO68900
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.30 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.222 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 77.758α = 90
b = 95.926β = 90
c = 164.869γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
XDSdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2014-03-12
    Type: Initial release
  • Version 1.1: 2014-03-26
    Changes: Database references, Structure summary
  • Version 1.2: 2014-04-02
    Changes: Database references
  • Version 1.3: 2023-09-20
    Changes: Data collection, Database references, Refinement description