1S4W

NMR structure of the cytoplasmic domain of integrin AIIb in DPC micelles


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 99 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Membrane-mediated structural transitions at the cytoplasmic face during integrin activation.

Vinogradova, O.Vaynberg, J.Kong, X.Haas, T.A.Plow, E.F.Qin, J.

(2004) Proc.Natl.Acad.Sci.USA 101: 4094-4099

  • DOI: 10.1073/pnas.0400742101
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Cytoplasmic face-mediated integrin inside-out activation remains a paradigm in transmembrane signal transduction. Emerging evidence suggests that this process involves dissociation of the complex between the integrin cytoplasmic tails; however, a dyn ...

    Cytoplasmic face-mediated integrin inside-out activation remains a paradigm in transmembrane signal transduction. Emerging evidence suggests that this process involves dissociation of the complex between the integrin cytoplasmic tails; however, a dynamic image of how it occurs on the membrane surface remains elusive. We show here that, whereas membrane-proximal helices of integrin alpha/beta cytoplasmic tails associate in cytoplasm-like aqueous medium, they become partially embedded into membrane-mimetic micelles when unclasped. Membrane embedding induces substantial structural changes of the cytoplasmic tails as compared to their aqueous conformations and suggests there may be an upward movement of the membrane-proximal helices into the membrane during their separation. We further demonstrate that the beta3 tail exhibits additional membrane binding site at its C terminus containing the NPLY motif. Talin, a key intracellular integrin activator, recognizes this site as well as the membrane-proximal helix, thereby promoting cytoplasmic tail separation along the membrane surface. These data provide a structural basis of membrane-mediated changes at the cytoplasmic face in regulating integrin activation and signaling.


    Organizational Affiliation

    Structural Biology Program, Department of Molecular Cardiology, Joseph J. Jacobs Center for Thrombosis and Vascular Biology, Lerner Research Institute, Cleveland Clinic Foundation, 9500 Euclid Avenue, Cleveland, OH 44195, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Integrin alpha-IIb
A
20Homo sapiensMutation(s): 0 
Gene Names: ITGA2B (GP2B, ITGAB)
Find proteins for P08514 (Homo sapiens)
Go to Gene View: ITGA2B
Go to UniProtKB:  P08514
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 99 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations 
  • Olderado: 1S4W Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-03-09
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance