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 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.175 

wwPDB Validation 3D Report Full Report


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.Mol.Biol. 8: 23

  • DOI: 10.1038/83007

  • 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 pro ...

    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

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
EXOENZYME S
A, B
135Pseudomonas aeruginosaMutation(s): 0 
Gene Names: exoS
Find proteins for Q51451 (Pseudomonas aeruginosa)
Go to UniProtKB:  Q51451
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
RAS-RELATED C3 BOTULINUM TOXIN SUBSTRATE 1
C, D
176Homo sapiensMutation(s): 0 
Gene Names: RAC1 (TC25)
Find proteins for P63000 (Homo sapiens)
Go to Gene View: RAC1
Go to UniProtKB:  P63000
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GDP
Query on GDP

Download SDF File 
Download CCD File 
C, D
GUANOSINE-5'-DIPHOSPHATE
C10 H15 N5 O11 P2
QGWNDRXFNXRZMB-UUOKFMHZSA-N
 Ligand Interaction
MG
Query on MG

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Download CCD File 
C, D
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
NI
Query on NI

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Download CCD File 
A, C, D
NICKEL (II) ION
Ni
VEQPNABPJHWNSG-UHFFFAOYSA-N
 Ligand Interaction
AF3
Query on AF3

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Download CCD File 
C, D
ALUMINUM FLUORIDE
Al F3
KLZUFWVZNOTSEM-UHFFFAOYSA-K
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.224 
  • R-Value Work: 0.175 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 46.025α = 90.00
b = 125.087β = 90.00
c = 136.284γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
AMoREphasing
CNSrefinement
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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