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Related Experiment Videos

How the Pseudomonas aeruginosa ExoS toxin downregulates Rac.

M Würtele1, E Wolf, K J Pederson

  • 1Max-Planck-Institut für molekulare Physiologie, Abteilung Strukturelle Biologie, Otto-Hahn-Str. 11, 44227 Dortmund, Germany.

Nature Structural Biology
|January 3, 2001
PubMed
Summary

Pseudomonas aeruginosa toxin ExoS, a small GTPase activating protein (GAP), inactivates Rac. Its unique structure and interaction mechanism offer new targets for combating antibiotic-resistant bacterial infections.

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Area of Science:

  • Microbiology
  • Structural Biology
  • Biochemistry

Background:

  • Pseudomonas aeruginosa is an opportunistic pathogen.
  • ExoS is a major toxin translocated via type III secretion.
  • ExoS has dual enzymatic functions: ADP-ribosylation of Ras and GTPase activating protein (GAP) activity towards Rho proteins.

Purpose of the Study:

  • To determine the three-dimensional structure of the complex between Rac and the GAP domain of ExoS.
  • To elucidate the mechanism of ExoS-mediated Rac inactivation.

Main Methods:

  • X-ray crystallography was used to determine the structure of the Rac-ExoS-GDP-AlF3 complex.
  • Bioinformatic analysis was performed to compare the ExoS GAP domain structure with known GAPs.

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Main Results:

  • The ExoS GAP domain is the smallest described GAP, comprising approximately 130 residues.
  • The ExoS GAP domain is an all-helical protein with no structural homology to eukaryotic RhoGAP or RasGAP folds.
  • ExoS utilizes an arginine finger to downregulate Rac, similar to other GAPs, but with unique interaction details.

Conclusions:

  • The ExoS GAP domain possesses a novel structure distinct from eukaryotic GAPs.
  • The unique ExoS-Rac interaction mechanism provides a potential target for therapeutic intervention.
  • Targeting ExoS could offer a strategy to overcome antibiotic resistance in Pseudomonas aeruginosa infections.