Structure of FERM protein

Experimental Data Snapshot

  • Resolution: 3.60 Å
  • R-Value Free: 0.317 
  • R-Value Work: 0.305 
  • R-Value Observed: 0.305 

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Structural basis of human full-length kindlin-3 homotrimer in an auto-inhibited state.

Bu, W.Levitskaya, Z.Loh, Z.Y.Jin, S.Basu, S.Ero, R.Yan, X.Wang, M.Ngan, S.F.C.Sze, S.K.Tan, S.M.Gao, Y.G.

(2020) PLoS Biol 18: e3000755-e3000755

  • DOI: https://doi.org/10.1371/journal.pbio.3000755
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Kindlin-1, -2, and -3 directly bind integrin β cytoplasmic tails to regulate integrin activation and signaling. Despite their functional significance and links to several diseases, structural information on full-length kindlin proteins remains unknown. Here, we report the crystal structure of human full-length kindlin-3, which reveals a novel homotrimer state. Unlike kindlin-3 monomer, which is the major population in insect and mammalian cell expression systems, kindlin-3 trimer does not bind integrin β cytoplasmic tail as the integrin-binding pocket in the F3 subdomain of 1 protomer is occluded by the pleckstrin homology (PH) domain of another protomer, suggesting that kindlin-3 is auto-inhibited upon trimer formation. This is also supported by functional assays in which kindlin-3 knockout K562 erythroleukemia cells reconstituted with the mutant kindlin-3 containing trimer-disrupting mutations exhibited an increase in integrin-mediated adhesion and spreading on fibronectin compared with those reconstituted with wild-type kindlin-3. Taken together, our findings reveal a novel mechanism of kindlin auto-inhibition that involves its homotrimer formation.

  • Organizational Affiliation

    School of Biological Sciences, Nanyang Technological University, Singapore, Singapore.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Fermitin family homolog 3,Fermitin family homolog 3,Fermitin family homolog 3
A, B, C
675Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for Q86UX7 (Homo sapiens)
Explore Q86UX7 
Go to UniProtKB:  Q86UX7
GTEx:  ENSG00000149781 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ86UX7
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.60 Å
  • R-Value Free: 0.317 
  • R-Value Work: 0.305 
  • R-Value Observed: 0.305 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 115.76α = 90
b = 204.62β = 90
c = 269.95γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Ministry of Education (MoE, Singapore)SingaporeMOE2017-T2-1-106

Revision History  (Full details and data files)

  • Version 1.0: 2020-06-03
    Type: Initial release
  • Version 1.1: 2020-07-22
    Changes: Database references
  • Version 1.2: 2024-03-27
    Changes: Data collection, Database references