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
  • Primary Citation of Related Structures:  
    2MTP

  • 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 remained obscure ...

    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
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Filamin-AA95Homo sapiensMutation(s): 0 
Gene Names: FLNAFLNFLN1
UniProt & NIH Common Fund Data Resources
Find proteins for P21333 (Homo sapiens)
Explore P21333 
Go to UniProtKB:  P21333
PHAROS:  P21333
GTEx:  ENSG00000196924 
Entity Groups  
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UniProt GroupP21333
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Integrin alpha-IIbB21Homo sapiensMutation(s): 0 
Gene Names: ITGA2BGP2BITGAB
UniProt & NIH Common Fund Data Resources
Find proteins for P08514 (Homo sapiens)
Explore P08514 
Go to UniProtKB:  P08514
PHAROS:  P08514
GTEx:  ENSG00000005961 
Entity Groups  
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UniProt GroupP08514
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Integrin beta-3C47Homo sapiensMutation(s): 2 
Gene Names: ITGB3GP3A
UniProt & NIH Common Fund Data Resources
Find proteins for P05106 (Homo sapiens)
Explore P05106 
Go to UniProtKB:  P05106
PHAROS:  P05106
GTEx:  ENSG00000259207 
Entity Groups  
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UniProt GroupP05106
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 
  • OLDERADO: 2MTP Olderado

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

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

Revision History  (Full details and data files)

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