2JF1

CRYSTAL STRUCTURE OF THE FILAMIN A REPEAT 21 COMPLEXED WITH THE INTEGRIN BETA2 CYTOPLASMIC TAIL PEPTIDE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.247 
  • R-Value Observed: 0.250 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Beta2 Integrin Phosphorylation on Thr758 Acts as a Molecular Switch to Regulate 14-3-3 and Filamin Binding.

Takala, H.Nurminen, E.Nurmi, S.M.Aatonen, M.Strandin, T.Takatalo, M.Kiema, T.Gahmberg, C.G.Ylanne, J.Fagerholm, S.C.

(2008) Blood 112: 1853

  • DOI: 10.1182/blood-2007-12-127795
  • Primary Citation of Related Structures:  
    2V7D, 2JF1

  • PubMed Abstract: 
  • Leukocyte integrins of the beta2 family are essential for immune cell-cell adhesion. In activated cells, beta2 integrins are phosphorylated on the cytoplasmic Thr758, leading to 14-3-3 protein recruitment to the beta2 integrin. The mutation of this phosphorylation site impairs cell adhesion, actin reorganization, and cell spreading ...

    Leukocyte integrins of the beta2 family are essential for immune cell-cell adhesion. In activated cells, beta2 integrins are phosphorylated on the cytoplasmic Thr758, leading to 14-3-3 protein recruitment to the beta2 integrin. The mutation of this phosphorylation site impairs cell adhesion, actin reorganization, and cell spreading. Thr758 is contained in a Thr triplet of beta2 that also mediates binding to filamin. Here, we investigated the binding of filamin, talin, and 14-3-3 proteins to phosphorylated and unphosphorylated beta2 integrins by biochemical methods and x-ray crystallography. 14-3-3 proteins bound only to the phosphorylated integrin cytoplasmic peptide, with a high affinity (K(d), 261 nM), whereas filamin bound only the unphosphorylated integrin cytoplasmic peptide (K(d), 0.5 mM). Phosphorylation did not regulate talin binding to beta2 directly, but 14-3-3 was able to outcompete talin for the binding to phosphorylated beta2 integrin. X-ray crystallographic data clearly explained how phosphorylation eliminated filamin binding and induced 14-3-3 protein binding. Filamin knockdown in T cells led to an increase in stimulated cell adhesion to ICAM-1-coated surfaces. Our results suggest that the phosphorylation of beta2 integrins on Thr758 acts as a molecular switch to inhibit filamin binding and allow 14-3-3 protein binding to the integrin cytoplasmic domain, thereby modulating T-cell adhesion.


    Organizational Affiliation

    Department of Biological and Environmental Science and Nanoscience Center, University of Jyväskylä, Jyväskylä, Finland.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
FILAMIN-AA97Homo sapiensMutation(s): 0 
Gene Names: FLNAFLNFLN1
Find proteins for P21333 (Homo sapiens)
Explore P21333 
Go to UniProtKB:  P21333
NIH Common Fund Data Resources
PHAROS:  P21333
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
INTEGRIN BETA-2 SUBUNITB [auth T]35Homo sapiensMutation(s): 0 
Gene Names: ITGB2CD18MFI7
Find proteins for P05107 (Homo sapiens)
Explore P05107 
Go to UniProtKB:  P05107
NIH Common Fund Data Resources
PHAROS:  P05107
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download Ideal Coordinates CCD File 
C [auth A]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.247 
  • R-Value Observed: 0.250 
  • Space Group: P 21 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 78.72α = 90
b = 78.72β = 90
c = 78.72γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

  • Deposited Date: 2007-01-25 
  • Released Date: 2008-02-05 
  • Deposition Author(s): Kiema, T., Ylanne, J.

Revision History  (Full details and data files)

  • Version 1.0: 2008-02-05
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance