1N3Y

Crystal structure of the alpha-X beta2 integrin I domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.209 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure and allosteric regulation of the alpha X beta 2 integrin I domain.

Vorup-Jensen, T.Ostermeier, C.Shimaoka, M.Hommel, U.Springer, T.A.

(2003) Proc Natl Acad Sci U S A 100: 1873-1878

  • DOI: 10.1073/pnas.0237387100
  • Primary Citation of Related Structures:  
    1N3Y

  • PubMed Abstract: 
  • The integrin alpha X beta 2 (CD11c/CD18, p150,95) binds ligands through the I domain of the alpha X subunit. Ligands include the complement factor fragment iC3b, a key component in the innate immune defense, which, together with the expression of alp ...

    The integrin alpha X beta 2 (CD11c/CD18, p150,95) binds ligands through the I domain of the alpha X subunit. Ligands include the complement factor fragment iC3b, a key component in the innate immune defense, which, together with the expression of alpha X beta 2 on dendritic cells and on other leukocytes, suggests a role in the immune response. We now report the structure of the alpha X I domain resolved at 1.65 A by x-ray crystallography. To analyze structural requirements for ligand binding we made a mutation in the alpha X I domain C-terminal helix, which increased the affinity for iC3b approximately 200-fold to 2.4 microM compared with the wild-type domain affinity of approximately 400 microM. Gel permeation chromatography supported a conformational change between the wild-type and mutated domains. Conservation of allosteric regulation in the alpha X I domain points to the functional importance of this phenomenon.


    Organizational Affiliation

    Center for Blood Research, Department of Pathology, Harvard Medical School, 200 Longwood Avenue, Boston, MA 02115, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Integrin alpha-XA198Homo sapiensMutation(s): 2 
Gene Names: ITGAX OR CD11CITGAXCD11C
Find proteins for P20702 (Homo sapiens)
Explore P20702 
Go to UniProtKB:  P20702
NIH Common Fund Data Resources
PHAROS  P20702
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.209 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 84.694α = 90
b = 84.694β = 90
c = 65.776γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement
CNXrefinement
CNSphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-02-18
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance