1L3Y

INTEGRIN EGF-LIKE MODULE 3 FROM THE BETA-2 SUBUNIT


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 15 
  • Selection Criteria: structures with acceptable covalent geometry,structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Cysteine-rich module structure reveals a fulcrum for integrin rearrangement upon activation.

Beglova, N.Blacklow, S.C.Takagi, J.Springer, T.A.

(2002) Nat.Struct.Mol.Biol. 9: 282-287

  • DOI: 10.1038/nsb779

  • PubMed Abstract: 
  • Cysteine-rich repeats in the integrin beta subunit stalk region relay activation signals to the ligand-binding headpiece. The NMR solution structure and disulfide bond connectivity of Cys-rich module-3 of the integrin beta2 subunit reveal a nosecone- ...

    Cysteine-rich repeats in the integrin beta subunit stalk region relay activation signals to the ligand-binding headpiece. The NMR solution structure and disulfide bond connectivity of Cys-rich module-3 of the integrin beta2 subunit reveal a nosecone-shaped variant of the EGF fold, termed an integrin-EGF (I-EGF) domain. Interdomain contacts between I-EGF domains 2 and 3 observed by NMR support a model in which the modules are related by an approximate two-fold screw axis in an extended arrangement. Our findings complement a 3.1 A crystal structure of the extracellular portion of integrin alphaVbeta3, which lacks an atomic model for I-EGF2 and a portion of I-EGF3. The disulfide connectivity of I-EGF3 chemically assigned here differs from the pairings suggested in the alphaVbeta3 structure. Epitopes that become exposed upon integrin activation and residues that restrain activation are defined in beta2 I-EGF domains 2 and 3. Superposition on the alphaVbeta3 structure reveals that they are buried. This observation suggests that the highly bent alphaVbeta3 structure represents the inactive conformation and that release of contacts with I-EGF modules 2 and 3 triggers a switchblade-like opening motion extending the integrin into its active conformation.


    Organizational Affiliation

    Department of Pathology, Harvard Medical School, 75 Francis St., Boston, Masschusetts 02115, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Integrin beta-2:CYSTEINE-RICH MODULE 3
A
41Homo sapiensMutation(s): 0 
Gene Names: ITGB2 (CD18, MFI7)
Find proteins for P05107 (Homo sapiens)
Go to Gene View: ITGB2
Go to UniProtKB:  P05107
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 15 
  • Selection Criteria: structures with acceptable covalent geometry,structures with the lowest energy 
  • Olderado: 1L3Y Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-04-01
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance