2K42

Solution Structure of the GTPase Binding Domain of WASP in Complex with EspFU, an EHEC Effector


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural mechanism of WASP activation by the enterohaemorrhagic E. coli effector EspF(U).

Cheng, H.C.Skehan, B.M.Campellone, K.G.Leong, J.M.Rosen, M.K.

(2008) Nature 454: 1009-1013

  • DOI: 10.1038/nature07160

  • PubMed Abstract: 
  • During infection, enterohaemorrhagic Escherichia coli (EHEC) takes over the actin cytoskeleton of eukaryotic cells by injecting the EspF(U) protein into the host cytoplasm. EspF(U) controls actin by activating members of the Wiskott-Aldrich syndrome ...

    During infection, enterohaemorrhagic Escherichia coli (EHEC) takes over the actin cytoskeleton of eukaryotic cells by injecting the EspF(U) protein into the host cytoplasm. EspF(U) controls actin by activating members of the Wiskott-Aldrich syndrome protein (WASP) family. Here we show that EspF(U) binds to the autoinhibitory GTPase binding domain (GBD) in WASP proteins and displaces it from the activity-bearing VCA domain (for verprolin homology, central hydrophobic and acidic regions). This interaction potently activates WASP and neural (N)-WASP in vitro and induces localized actin assembly in cells. In the solution structure of the GBD-EspF(U) complex, EspF(U) forms an amphipathic helix that binds the GBD, mimicking interactions of the VCA domain in autoinhibited WASP. Thus, EspF(U) activates WASP by competing directly for the VCA binding site on the GBD. This mechanism is distinct from that used by the eukaryotic activators Cdc42 and SH2 domains, which globally destabilize the GBD fold to release the VCA. Such diversity of mechanism in WASP proteins is distinct from other multimodular systems, and may result from the intrinsically unstructured nature of the isolated GBD and VCA elements. The structural incompatibility of the GBD complexes with EspF(U) and Cdc42/SH2, plus high-affinity EspF(U) binding, enable EHEC to hijack the eukaryotic cytoskeletal machinery effectively.


    Organizational Affiliation

    Department of Biochemistry and Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Wiskott-Aldrich syndrome protein
A
72Homo sapiensGene Names: WAS (IMD2)
Find proteins for P42768 (Homo sapiens)
Go to Gene View: WAS
Go to UniProtKB:  P42768
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
ESPFU
B
36Escherichia coli O157:H7N/A
Find proteins for A0A0H3JD26 (Escherichia coli O157:H7)
Go to UniProtKB:  A0A0H3JD26
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations 
  • Olderado: 2K42 Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-07-22
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance