2MTP

The structure of Filamin repeat 21 bound to integrin

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history. 

Literature

Structural mechanism of integrin inactivation by filamin.

Liu, J., Das, M., Yang, J., Ithychanda, S.S., Yakubenko, V.P., Plow, E.F., Qin, J.

(2015) Nat.Struct.Mol.Biol. 22: 383-389

  • DOI: 10.1038/nsmb.2999

  • PubMed Abstract: 

    • Activation of heterodimeric (αβ) integrin is crucial for regulating cell adhesion. Binding of talin to the cytoplasmic face of integrin activates the receptor, but how integrin is maintained in a resting state to counterbalance its activation has rem ...

    Activation of heterodimeric (αβ) integrin is crucial for regulating cell adhesion. Binding of talin to the cytoplasmic face of integrin activates the receptor, but how integrin is maintained in a resting state to counterbalance its activation has remained obscure. Here, we report the structure of the cytoplasmic domain of human integrin αIIbβ3 bound to its inhibitor, the immunoglobin repeat 21 of filamin A (FLNa-Ig21). The structure reveals an unexpected ternary complex in which FLNa-Ig21 not only binds to the C terminus of the integrin β3 cytoplasmic tail (CT), as previously predicted, but also engages N-terminal helices of αIIb and β3 CTs to stabilize an inter-CT clasp that helps restrain the integrin in a resting state. Combined with functional data, the structure reveals a new mechanism of filamin-mediated retention of inactive integrin, suggesting a new framework for understanding regulation of integrin activation and adhesion.

    Organizational Affiliation: 

    Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Filamin-A
A
95Homo sapiensMutation(s): 0 
Gene Names: FLNA (FLN, FLN1)
Find proteins for P21333 (Homo sapiens)
Go to Gene View: FLNA
Go to UniProtKB:  P21333
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Integrin alpha-IIb
B
21Homo sapiensMutation(s): 0 
Gene Names: ITGA2B (GP2B, ITGAB)
Find proteins for P08514 (Homo sapiens)
Go to Gene View: ITGA2B
Go to UniProtKB:  P08514
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Integrin beta-3
C
47Homo sapiensMutation(s): 2 
Gene Names: ITGB3 (GP3A)
Find proteins for P05106 (Homo sapiens)
Go to Gene View: ITGB3
Go to UniProtKB:  P05106
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report or Ramachandran Plots


View more in-depth experimental data

Entry History 

Deposition Data

  • Deposited Date: 2014-08-28 
  • Released Date: 2015-04-01 
  • Deposition Author(s): Liu, J., Qin, J.

Revision History 

  • Version 1.0: 2015-04-01
    Type: Initial release
  • Version 1.1: 2015-07-01
    Type: Database references