1HE1

Crystal structure of the complex between the GAP domain of the Pseudomonas aeruginosa ExoS toxin and human Rac

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.175 

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This is version 1.2 of the entry. See complete history. 


Literature

How the Pseudomonas Aeruginosa Exos Toxin Downregulates Rac

Wurtele, M., Wolf, E., Pederson, K.J., Buchwald, G., Ahmadian, M.R., Barbieri, J.T., Wittinghofer, A.

(2001) Nat Struct Biol 8: 23

  • DOI: 10.1038/83007
  • Primary Citation of Related Structures:  
    1HE1

  • PubMed Abstract: 

    • Pseudomonas aeruginosa is an opportunistic bacterial pathogen. One of its major toxins, ExoS, is translocated into eukaryotic cells by a type III secretion pathway. ExoS is a dual function enzyme that affects two different Ras-related GTP binding proteins ...

    Pseudomonas aeruginosa is an opportunistic bacterial pathogen. One of its major toxins, ExoS, is translocated into eukaryotic cells by a type III secretion pathway. ExoS is a dual function enzyme that affects two different Ras-related GTP binding proteins. The C-terminus inactivates Ras through ADP ribosylation, while the N-terminus inactivates Rho proteins through its GTPase activating protein (GAP) activity. Here we have determined the three-dimensional structure of a complex between Rac and the GAP domain of ExoS in the presence of GDP and AlF3. Composed of approximately 130 residues, this ExoS domain is the smallest GAP hitherto described. The GAP domain of ExoS is an all-helical protein with no obvious structural homology, and thus no recognizable evolutionary relationship, with the eukaryotic RhoGAP or RasGAP fold. Similar to other GAPs, ExoS downregulates Rac using an arginine finger to stabilize the transition state of the GTPase reaction, but the details of the ExoS-Rac interaction are unique. Considering the intrinsic resistance of P. aeruginosa to antibiotics, this might open up a new avenue towards blocking its pathogenicity.

    Organizational Affiliation: 

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



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
EXOENZYME SA, B135Pseudomonas aeruginosaMutation(s): 0 
Gene Names: exoS
Find proteins for Q51451 (Pseudomonas aeruginosa)
Explore Q51451 
Go to UniProtKB:  Q51451
Protein Feature View
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  • Reference Sequence
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(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
RAS-RELATED C3 BOTULINUM TOXIN SUBSTRATE 1C, D176Homo sapiensMutation(s): 0 
Gene Names: RAC1, TC25, MIG5
EC: 3.6.5.2
Find proteins for P63000 (Homo sapiens)
Explore P63000 
Go to UniProtKB:  P63000
NIH Common Fund Data Resources
PHAROS:  P63000
GTEx:  ENSG00000136238
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.175 
  • R-Value Observed: 0.175 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 46.025α = 90
b = 125.087β = 90
c = 136.284γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-01-02
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance