2IBF

Human vinculin's head domain (Vh1, residues 1-258) in complex with two vinculin binding sites of Shigella flexneri's IpaA (residues 565-587)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.243 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Vinculin binding in its closed conformation by a helix addition mechanism.

Nhieu, G.T.Izard, T.

(2007) Embo J. 26: 4588-4596

  • DOI: 10.1038/sj.emboj.7601863

  • PubMed Abstract: 
  • Vinculin links integrin receptors to the actin cytoskeleton by binding to talin. Vinculin is held in an inactive, closed-clamp conformation through hydrophobic interactions between its head and tail domains, and vinculin activation has long been thou ...

    Vinculin links integrin receptors to the actin cytoskeleton by binding to talin. Vinculin is held in an inactive, closed-clamp conformation through hydrophobic interactions between its head and tail domains, and vinculin activation has long been thought to be dependent upon severing the head-tail interaction. Talin, alpha-actinin, and the invasin IpaA of Shigella flexneri sever vinculin's head-tail interaction by inserting an alpha-helix into vinculin's N-terminal four-helical bundle, provoking extensive conformational changes by a helical bundle conversion mechanism; these alterations in vinculin structure displace its tail domain, allowing vinculin to bind to its other partners. IpaA harbors two juxtaposed alpha-helical vinculin-binding sites (VBS) in its C-terminus. Here, we report that the lower affinity VBS of IpaA can also bind to the adjacent C-terminal four-helical bundle of vinculin's head domain through a helix addition mechanism. These hydrophobic interactions do not alter the conformation of this helical bundle, and the architecture of the complex suggests that IpaA can simultaneously interact with both of the four-helical bundle domains of vinculin's N-terminus to stabilize vinculin-IpaA interactions.


    Organizational Affiliation

    Unité de Pathogénie Microbienne Moléculaire, Institut Pasteur, Inserm U786, Paris, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Vinculin
A
266Homo sapiensMutation(s): 0 
Gene Names: VCL
Find proteins for P18206 (Homo sapiens)
Go to Gene View: VCL
Go to UniProtKB:  P18206
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Invasin ipaA
B, D
25Shigella flexneriMutation(s): 0 
Gene Names: ipaA
Find proteins for P18010 (Shigella flexneri)
Go to UniProtKB:  P18010
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.243 
  • Space Group: P 43 3 2
Unit Cell:
Length (Å)Angle (°)
a = 154.478α = 90.00
b = 154.478β = 90.00
c = 154.478γ = 90.00
Software Package:
Software NamePurpose
BUSTER-TNTrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2006-09-11 
  • Released Date: 2007-09-18 
  • Deposition Author(s): Izard, T.

Revision History 

  • Version 1.0: 2007-09-18
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance