1DPQ

SOLUTION STRUCTURE OF THE CONSTITUTIVELY ACTIVE MUTANT OF THE INTEGRIN ALPHA IIB CYTOPLASMIC DOMAIN.


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 30 
  • Conformers Submitted: 11 
  • Selection Criteria: back calculated data agree with experimental NOESY spectrum 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

A structural basis for integrin activation by the cytoplasmic tail of the alpha IIb-subunit.

Vinogradova, O.Haas, T.Plow, E.F.Qin, J.

(2000) Proc Natl Acad Sci U S A 97: 1450-1455

  • DOI: 10.1073/pnas.040548197
  • Primary Citation of Related Structures:  
    1DPK, 1DPQ

  • PubMed Abstract: 
  • A key step in the activation of heterodimeric integrin adhesion receptors is the transmission of an agonist-induced cellular signal from the short alpha- and/or beta-cytoplasmic tails to the extracellular domains of the receptor. The structural details of how the cytoplasmic tails mediate such an inside-out signaling process remain unclear ...

    A key step in the activation of heterodimeric integrin adhesion receptors is the transmission of an agonist-induced cellular signal from the short alpha- and/or beta-cytoplasmic tails to the extracellular domains of the receptor. The structural details of how the cytoplasmic tails mediate such an inside-out signaling process remain unclear. We report herein the NMR structures of a membrane-anchored cytoplasmic tail of the alpha(IIb)-subunit and of a mutant alpha(IIb)-cytoplasmic tail that renders platelet integrin alpha(IIb)beta(3) constitutively active. The structure of the wild-type alpha(IIb)-cytoplasmic tail reveals a "closed" conformation where the highly conserved N-terminal membrane-proximal region forms an alpha-helix followed by a turn, and the acidic C-terminal loop interacts with the N-terminal helix. The structure of the active mutant is significantly different, having an "open" conformation where the interactions between the N-terminal helix and C-terminal region are abolished. Consistent with these structural differences, the two peptides differ in function: the wild-type peptide suppressed alpha(IIb)beta(3) activation, whereas the mutant peptide did not. These results provide an atomic explanation for extensive biochemical/mutational data and support a conformation-based "on/off switch" model for integrin activation.


    Organizational Affiliation

    Department of Molecular Cardiology, Lerner Research Institute, Cleveland, OH 44195, USA.



Macromolecules
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
INTEGRIN ALPHA-IIB SUBUNITA20N/AMutation(s): 2 
UniProt & NIH Common Fund Data Resources
Find proteins for P08514 (Homo sapiens)
Explore P08514 
Go to UniProtKB:  P08514
PHAROS:  P08514
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 30 
  • Conformers Submitted: 11 
  • Selection Criteria: back calculated data agree with experimental NOESY spectrum 
  • OLDERADO: 1DPQ Olderado

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-02-28
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-11-03
    Changes: Data collection, Database references, Derived calculations, Experimental preparation