1HE9 | pdb_00001he9

Crystal structure of the GAP domain of the Pseudomonas aeruginosa ExoS toxin

• PDB DOI: https://doi.org/10.2210/pdb1HE9/pdb

• Classification: TOXIN (EXOENZYME S)
• Organism(s): Pseudomonas aeruginosa
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2000-11-21 Released: 2001-03-19 
• Deposition Author(s): Wurtele, M., Renault, L., Barbieri, J.T., Wittinghofer, A., Wolf, E.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free: 
  0.265 (Depositor), 0.271 (DCC) 
• R-Value Work: 
  0.257 (Depositor), 0.259 (DCC) 
• R-Value Observed: 
  0.257 (Depositor) 

Literature

Structure of the Exos Gtpase Activating Domain

Wurtele, M., Renault, L., Barbieri, J.T., Wittinghofer, A., Wolf, E.

(2001) FEBS Lett 491: 26

• PubMed: 11226412 
• DOI: https://doi.org/10.1016/s0014-5793(01)02105-6
• Primary Citation Related Structures: 
  1HE9


• PubMed Abstract: 
  

  Pseudomonas aeruginosa is an opportunistic bacterial pathogen of great medical relevance. One of its major toxins, exoenzyme S (ExoS), is a dual function protein with a C-terminal Ras-ADP-ribosylation domain and an N-terminal GTPase activating protein (GAP) domain specific for Rho-family proteins. We report here the three-dimensional structure of the N-terminal domain of ExoS determined by X-ray crystallography to 2.4 A resolution. Its fold is all helical with a four helix bundle core capped by additional irregular helices. Loops that are known to interact with Rho-family proteins show very large mobility. Considering the importance of ExoS in Pseudomonas pathogenicity, this structure could be of interest for drug targeting.

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Organizational Affiliation: 
• Max-Planck-Institut für molekulare Physiologie, Abteilung Strukturelle Biologie, Otto-Hahn-Str. 11, 44227 Dortmund, Germany.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 generated by PQS (software)

Macromolecule Content 

• Total Structure Weight: 14.43 kDa 
• Atom Count: 1,065 
• Modeled Residue Count: 134 
• Deposited Residue Count: 134 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
EXOENZYME S	A	134	Pseudomonas aeruginosa	Mutation(s): 3  Gene Names: EXOS
UniProt
Find proteins for Q51451 (Pseudomonas aeruginosa) Explore Q51451  Go to UniProtKB:  Q51451

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MSE	A	L-PEPTIDE LINKING	C5 H11 N O2 Se		MET

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free:  0.265 (Depositor), 0.271 (DCC) 
• R-Value Work:  0.257 (Depositor), 0.259 (DCC) 
• R-Value Observed: 0.257 (Depositor) 

Space Group: C 2 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 42.897	α = 90
b = 55.646	β = 90
c = 107.472	γ = 90

Software Package:

Software Name	Purpose
CNS	refinement
DENZO	data reduction
SCALEPACK	data scaling
SHARP	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2001-03-19 
Deposition Author(s): Wurtele, M., Renault, L., Barbieri, J.T., Wittinghofer, A., Wolf, E.

Revision History  

• Version 1.0: 2001-03-19
  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: 2024-11-13
  Changes: Data collection, Database references, Derived calculations, Other, Structure summary