5XQ1

Structural basis of kindlin-mediated integrin recognition and activation


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.95 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.222 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structural basis of kindlin-mediated integrin recognition and activation

Li, H.Deng, Y.Sun, K.Yang, H.Liu, J.Wang, M.Zhang, Z.Lin, J.Wu, C.Wei, Z.Yu, C.

(2017) Proc Natl Acad Sci U S A 114: 9349-9354

  • DOI: https://doi.org/10.1073/pnas.1703064114
  • Primary Citation of Related Structures:  
    5XPY, 5XPZ, 5XQ0, 5XQ1

  • PubMed Abstract: 

    Kindlins and talins are integrin-binding proteins that are critically involved in integrin activation, an essential process for many fundamental cellular activities including cell-matrix adhesion, migration, and proliferation. As FERM-domain-containing proteins, talins and kindlins, respectively, bind different regions of β-integrin cytoplasmic tails. However, compared with the extensively studied talin, little is known about how kindlins specifically interact with integrins and synergistically enhance their activation by talins. Here, we determined crystal structures of kindlin2 in the apo-form and the β1- and β3-integrin bound forms. The apo-structure shows an overall architecture distinct from talins. The complex structures reveal a unique integrin recognition mode of kindlins, which combines two binding motifs to provide specificity that is essential for integrin activation and signaling. Strikingly, our structures uncover an unexpected dimer formation of kindlins. Interrupting dimer formation impairs kindlin-mediated integrin activation. Collectively, the structural, biochemical, and cellular results provide mechanistic explanations that account for the effects of kindlins on integrin activation as well as for how kindlin mutations found in patients with Kindler syndrome and leukocyte-adhesion deficiency may impact integrin-mediated processes.


  • Organizational Affiliation

    Department of Biology, Southern University of Science and Technology, Shenzhen 518055, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Fermitin family homolog 2,Integrin beta-3
A, B
485Mus musculusMutation(s): 0 
Gene Names: Fermt2Plekhc1Itgb3
UniProt
Find proteins for O54890 (Mus musculus)
Explore O54890 
Go to UniProtKB:  O54890
Find proteins for Q8CIB5 (Mus musculus)
Explore Q8CIB5 
Go to UniProtKB:  Q8CIB5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsQ8CIB5O54890
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.95 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.222 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 75.973α = 90
b = 75.973β = 90
c = 387.042γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data scaling
PDB_EXTRACTdata extraction
HKL-2000data reduction
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-07-26
    Type: Initial release
  • Version 1.1: 2017-08-09
    Changes: Database references
  • Version 1.2: 2017-09-06
    Changes: Database references
  • Version 1.3: 2023-11-22
    Changes: Data collection, Database references, Refinement description