3DYJ

Crystal structure a talin rod fragment


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.214 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural determinants of integrin binding to the talin rod

Gingras, A.R.Ziegler, W.H.Bobkov, A.A.Joyce, M.G.Fasci, D.Himmel, M.Rothemund, S.Ritter, A.Grossmann, J.G.Patel, B.Bate, N.Goult, B.T.Emsley, J.Barsukov, I.L.Roberts, G.C.Liddington, R.C.Ginsberg, M.H.Critchley, D.R.

(2009) J.Biol.Chem. 284: 8866-8876

  • DOI: 10.1074/jbc.M805937200

  • PubMed Abstract: 
  • The adaptor protein talin serves both to activate the integrin family of cell adhesion molecules and to couple integrins to the actin cytoskeleton. Integrin activation has been shown to involve binding of the talin FERM domain to membrane proximal se ...

    The adaptor protein talin serves both to activate the integrin family of cell adhesion molecules and to couple integrins to the actin cytoskeleton. Integrin activation has been shown to involve binding of the talin FERM domain to membrane proximal sequences in the cytoplasmic domain of the integrin beta-subunit. However, a second integrin-binding site (IBS2) has been identified near the C-terminal end of the talin rod. Here we report the crystal structure of IBS2 (residues 1974-2293), which comprises two five-helix bundles, "IBS2-A" (1974-2139) and "IBS2-B" (2140-2293), connected by a continuous helix with a distinct kink at its center that is stabilized by side-chain H-bonding. Solution studies using small angle x-ray scattering and NMR point to a fairly flexible quaternary organization. Using pull-down and enzyme-linked immunosorbent assays, we demonstrate that integrin binding requires both IBS2 domains, as does binding to acidic phospholipids and robust targeting to focal adhesions. We have defined the membrane proximal region of the integrin cytoplasmic domain as the major binding region, although more membrane distal regions are also required for strong binding. Alanine-scanning mutagenesis points to an important electrostatic component to binding. Thermal unfolding experiments show that integrin binding induces conformational changes in the IBS2 module, which we speculate are linked to vinculin and membrane binding.


    Organizational Affiliation

    Department of Biochemistry, University of Leicester, Lancaster Road, Leicester LE1 9HN, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TALIN-1
A, B
332Mus musculusGene Names: Tln1 (Tln)
Find proteins for P26039 (Mus musculus)
Go to UniProtKB:  P26039
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.214 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 58.713α = 90.00
b = 57.648β = 102.96
c = 92.547γ = 90.00
Software Package:
Software NamePurpose
ADSCdata collection
SOLVEphasing
DENZOdata reduction
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-01-27
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance