2K9J

Integrin alphaIIb-beta3 transmembrane complex


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 21 
  • Conformers Submitted: 21 
  • Selection Criteria: all calculated structures submitted 

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This is version 1.1 of the entry. See complete history


Literature

The structure of the integrin alphaIIbbeta3 transmembrane complex explains integrin transmembrane signalling

Lau, T.L.Kim, C.Ginsberg, M.H.Ulmer, T.S.

(2009) EMBO J 28: 1351-1361

  • DOI: 10.1038/emboj.2009.63
  • Primary Citation of Related Structures:  
    2K9J

  • PubMed Abstract: 
  • Heterodimeric integrin adhesion receptors regulate cell migration, survival and differentiation in metazoa by communicating signals bi-directionally across the plasma membrane. Protein engineering and mutagenesis studies have suggested that the dissociation of a complex formed by the single-pass transmembrane (TM) segments of the alpha and beta subunits is central to these signalling events ...

    Heterodimeric integrin adhesion receptors regulate cell migration, survival and differentiation in metazoa by communicating signals bi-directionally across the plasma membrane. Protein engineering and mutagenesis studies have suggested that the dissociation of a complex formed by the single-pass transmembrane (TM) segments of the alpha and beta subunits is central to these signalling events. Here, we report the structure of the integrin alphaIIbbeta3 TM complex, structure-based site-directed mutagenesis and lipid embedding estimates to reveal the structural event that underlies the transition from associated to dissociated states, that is, TM signalling. The complex is stabilized by glycine-packing mediated TM helix crossing within the extracellular membrane leaflet, and by unique hydrophobic and electrostatic bridges in the intracellular leaflet that mediate an unusual, asymmetric association of the 24- and 29-residue alphaIIb and beta3 TM helices. The structurally unique, highly conserved integrin alphaIIbbeta3 TM complex rationalizes bi-directional signalling and represents the first structure of a heterodimeric TM receptor complex.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, Zilkha Neurogenetic Institute, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Integrin alpha-IIb light chainA42Homo sapiensMutation(s): 0 
Gene Names: ITGA2BGP2BITGAB
Find proteins for P08514 (Homo sapiens)
Explore P08514 
Go to UniProtKB:  P08514
NIH Common Fund Data Resources
PHAROS:  P08514
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Integrin beta-3B43Homo sapiensMutation(s): 1 
Gene Names: ITGB3GP3A
Find proteins for P05106 (Homo sapiens)
Explore P05106 
Go to UniProtKB:  P05106
NIH Common Fund Data Resources
PHAROS:  P05106
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 21 
  • Conformers Submitted: 21 
  • Selection Criteria: all calculated structures submitted 
  • OLDERADO: 2K9J Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-03-24
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance