1MQA

Crystal structure of high affinity alphaL I domain in the absence of ligand or metal


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.249 
  • R-Value Observed: 0.249 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structures of the aL I domain and its complex with ICAM-1 reveal a shape-shifting pathway for integrin regulation

Shimaoka, M.Xiao, T.Liu, J.-H.Yang, Y.Dong, Y.Jun, C.-D.McCormack, A.Zhang, R.Joachimiak, A.Takagi, J.Wang, J.-H.Springer, T.A.

(2003) Cell 112: 99-111

  • DOI: https://doi.org/10.1016/s0092-8674(02)01257-6
  • Primary Citation of Related Structures:  
    1MJN, 1MQ8, 1MQ9, 1MQA

  • PubMed Abstract: 

    The structure of the I domain of integrin alpha L beta 2 bound to the Ig superfamily ligand ICAM-1 reveals the open ligand binding conformation and the first example of an integrin-IgSF interface. The I domain Mg2+ directly coordinates Glu-34 of ICAM-1, and a dramatic swing of I domain residue Glu-241 enables a critical salt bridge. Liganded and unliganded structures for both high- and intermediate-affinity mutant I domains reveal that ligand binding can induce conformational change in the alpha L I domain and that allosteric signals can convert the closed conformation to intermediate or open conformations without ligand binding. Pulling down on the C-terminal alpha 7 helix with introduced disulfide bonds ratchets the beta 6-alpha 7 loop into three different positions in the closed, intermediate, and open conformations, with a progressive increase in affinity.


  • Organizational Affiliation

    The Center for Blood Research, Department of Pathology, Department of Anesthesia, Department of Pediatrics, Boston, Massachusetts 02115.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Integrin alpha-L180Homo sapiensMutation(s): 2 
Gene Names: LFA-1 (AlphaLbeta2)
UniProt & NIH Common Fund Data Resources
Find proteins for P20701 (Homo sapiens)
Explore P20701 
Go to UniProtKB:  P20701
PHAROS:  P20701
GTEx:  ENSG00000005844 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP20701
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.249 
  • R-Value Observed: 0.249 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.864α = 90
b = 121.324β = 90
c = 54.059γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
SCALEPACKdata scaling
AMoREphasing
CNSrefinement
HKL-2000data reduction

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-01-14
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-10-27
    Changes: Database references