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 

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.USA 100: 1873-1878

  • DOI: 10.1073/pnas.0237387100

  • 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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Integrin alpha-X
A
198Homo sapiensMutation(s): 2 
Gene Names: ITGAX (CD11C)
Find proteins for P20702 (Homo sapiens)
Go to Gene View: ITGAX
Go to UniProtKB:  P20702
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.208 
  • Space Group: P 61
Unit Cell:
Length (Å)Angle (°)
a = 84.694α = 90.00
b = 84.694β = 90.00
c = 65.776γ = 120.00
Software Package:
Software NamePurpose
DENZOdata reduction
CNXrefinement
CNSphasing
CNSrefinement
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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