5E6R

Structures of leukocyte integrin aLb2: The aI domain, the headpiece, and the pocket for the internal ligand


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.901 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.193 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Leukocyte integrin alpha L beta 2 headpiece structures: The alpha I domain, the pocket for the internal ligand, and concerted movements of its loops.

Sen, M.Springer, T.A.

(2016) Proc.Natl.Acad.Sci.USA 113: 2940-2945

  • DOI: 10.1073/pnas.1601379113
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • High-resolution crystal structures of the headpiece of lymphocyte function-associated antigen-1 (integrin αLβ2) reveal how the αI domain interacts with its platform formed by the α-subunit β-propeller and β-subunit βI domains. The αLβ2 structures com ...

    High-resolution crystal structures of the headpiece of lymphocyte function-associated antigen-1 (integrin αLβ2) reveal how the αI domain interacts with its platform formed by the α-subunit β-propeller and β-subunit βI domains. The αLβ2 structures compared with αXβ2 structures show that the αI domain, tethered through its N-linker and a disulfide to a stable β-ribbon pillar near the center of the platform, can undergo remarkable pivoting and tilting motions that appear buffered by N-glycan decorations that differ between αL and αX subunits. Rerefined β2 integrin structures reveal details including pyroglutamic acid at the β2 N terminus and bending within the EGF1 domain. Allostery is relayed to the αI domain by an internal ligand that binds to a pocket at the interface between the β-propeller and βI domains. Marked differences between the αL and αX subunit β-propeller domains concentrate near the binding pocket and αI domain interfaces. Remarkably, movement in allostery in the βI domain of specificity determining loop 1 (SDL1) causes concerted movement of SDL2 and thereby tightens the binding pocket for the internal ligand.


    Organizational Affiliation

    Program in Cellular and Molecular Medicine, Children's Hospital Boston, and Departments of Biological Chemistry and Molecular Pharmacology and of Medicine, Harvard Medical School, Boston, MA 02115; Department of Biology and Biochemistry, University of Houston, Houston, TX 77204.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Integrin alpha-L
A
795Homo sapiensMutation(s): 2 
Gene Names: ITGAL (CD11A)
Find proteins for P20701 (Homo sapiens)
Go to Gene View: ITGAL
Go to UniProtKB:  P20701
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Integrin beta-2
B
510Homo sapiensMutation(s): 1 
Gene Names: ITGB2 (CD18, MFI7)
Find proteins for P05107 (Homo sapiens)
Go to Gene View: ITGB2
Go to UniProtKB:  P05107
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A, B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
A, B
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.901 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.193 
  • Space Group: P 61
Unit Cell:
Length (Å)Angle (°)
a = 153.929α = 90.00
b = 153.929β = 90.00
c = 116.454γ = 120.00
Software Package:
Software NamePurpose
XDSdata scaling
XDSdata reduction
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Cancer InstituteUnited StatesNCI CA031798

Revision History 

  • Version 1.0: 2016-03-02
    Type: Initial release
  • Version 1.1: 2016-03-16
    Type: Database references
  • Version 1.2: 2016-05-11
    Type: Database references
  • Version 1.3: 2016-07-20
    Type: Data collection
  • Version 1.4: 2017-09-27
    Type: Author supporting evidence, Derived calculations