4K6L

Structure of Typhoid Toxin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.393 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.207 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structure and function of the Salmonella Typhi chimaeric A(2)B(5) typhoid toxin.

Song, J.Gao, X.Galan, J.E.

(2013) Nature 499: 350-354

  • DOI: 10.1038/nature12377

  • PubMed Abstract: 
  • Salmonella enterica serovar Typhi (S. Typhi) differs from most other salmonellae in that it causes a life-threatening systemic infection known as typhoid fever. The molecular bases for its unique clinical presentation are unknown. Here we find that t ...

    Salmonella enterica serovar Typhi (S. Typhi) differs from most other salmonellae in that it causes a life-threatening systemic infection known as typhoid fever. The molecular bases for its unique clinical presentation are unknown. Here we find that the systemic administration of typhoid toxin, a unique virulence factor of S. Typhi, reproduces many of the acute symptoms of typhoid fever in an animal model. We identify specific carbohydrate moieties on specific surface glycoproteins that serve as receptors for typhoid toxin, which explains its broad cell target specificity. We present the atomic structure of typhoid toxin, which shows an unprecedented A2B5 organization with two covalently linked A subunits non-covalently associated to a pentameric B subunit. The structure provides insight into the toxin's receptor-binding specificity and delivery mechanisms and reveals how the activities of two powerful toxins have been co-opted into a single, unique toxin that can induce many of the symptoms characteristic of typhoid fever. These findings may lead to the development of potentially life-saving therapeutics against typhoid fever.


    Organizational Affiliation

    Department of Microbial Pathogenesis, Yale University School of Medicine, New Haven, Connecticut 06536, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Putative pertussis-like toxin subunit
A, B, C, D, E
114Salmonella typhiMutation(s): 0 
Find proteins for Q8Z6A3 (Salmonella typhi)
Go to UniProtKB:  Q8Z6A3
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Cytolethal distending toxin subunit B homolog
F
255Salmonella typhiMutation(s): 0 
Gene Names: cdtB
Find proteins for Q8Z6A7 (Salmonella typhi)
Go to UniProtKB:  Q8Z6A7
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Putative pertussis-like toxin subunit
G
224Salmonella typhiMutation(s): 0 
EC: 2.4.2.-
Find proteins for Q8Z6A4 (Salmonella typhi)
Go to UniProtKB:  Q8Z6A4
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.393 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.207 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 78.386α = 90.00
b = 261.076β = 90.00
c = 109.896γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data scaling
CrystalCleardata collection
PHASESphasing
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-07-17
    Type: Initial release
  • Version 1.1: 2013-07-24
    Type: Database references
  • Version 1.2: 2013-07-31
    Type: Database references
  • Version 1.3: 2014-10-29
    Type: Structure summary