2OZ4

Structural Plasticity in IgSF Domain 4 of ICAM-1 Mediates Cell Surface Dimerization


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.209 

Starting Models: experimental
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This is version 2.1 of the entry. See complete history


Literature

Structural plasticity in Ig superfamily domain 4 of ICAM-1 mediates cell surface dimerization.

Chen, X.Kim, T.D.Carman, C.V.Mi, L.Z.Song, G.Springer, T.A.

(2007) Proc Natl Acad Sci U S A 104: 15358-15363

  • DOI: https://doi.org/10.1073/pnas.0707406104
  • Primary Citation of Related Structures:  
    2OZ4

  • PubMed Abstract: 

    The Ig superfamily (IgSF) intercellular adhesion molecule-1 (ICAM-1) equilibrates between monomeric and dimeric forms on the cell surface, and dimerization enhances cell adhesion. A crystal structure of ICAM-1 IgSF domains (D) 3-5 revealed a unique dimerization interface in which D4s of two protomers fuse through edge beta-strands to form a single super beta-sandwich domain. Here, we describe a crystal structure at 2.7-A resolution of monomeric ICAM-1 D3-D5, stabilized by the monomer-specific Fab CA7. CA7 binds to D5 in a region that is buried in the dimeric interface and is distal from the dimerization site in D4. In monomeric ICAM-1 D3-D5, a 16-residue loop in D4 that is disordered in the dimeric structure could clearly be traced as a BC loop, a short C strand, and a CE meander with a cis-Pro followed by a solvent-exposed, flexible four-residue region. Deletions of 6 or 10 residues showed that the C-strand is essential for monomer stability, whereas a distinct six-residue deletion showed little contribution of the CE meander. Mutation of two inward-pointing Leu residues in edge beta-strand E to Lys increased monomer stability, confirming the hypothesis that inward-pointing charged side chains on edge beta-strands are an important design feature to prevent beta-supersheet formation. Overall, the studies reveal that monomer-dimer transition is associated with a surprisingly large, physiologically relevant, IgSF domain rearrangement.


  • Organizational Affiliation

    Immune Disease Institute, Department of Pathology, Harvard Medical School, Boston, MA 02115, USA.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Intercellular adhesion molecule 1265Homo sapiensMutation(s): 0 
Gene Names: ICAM1
UniProt & NIH Common Fund Data Resources
Find proteins for P05362 (Homo sapiens)
Explore P05362 
Go to UniProtKB:  P05362
PHAROS:  P05362
GTEx:  ENSG00000090339 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP05362
Glycosylation
Glycosylation Sites: 3Go to GlyGen: P05362-1
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
FAB FRAGMENT LIGHT CHAINB [auth L]214Mus musculusMutation(s): 0 
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Sequence Annotations
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
FAB FRAGMENT, HEAVY CHAINC [auth H]214Mus musculusMutation(s): 0 
UniProt
Find proteins for P01757 (Mus musculus)
Explore P01757 
Go to UniProtKB:  P01757
Entity Groups  
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UniProt GroupP01757
Sequence Annotations
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  • Reference Sequence
Oligosaccharides

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Entity ID: 4
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-L-fucopyranose-(1-6)-2-acetamido-2-deoxy-beta-D-glucopyranoseD [auth B]2N-Glycosylation
Glycosylation Resources
GlyTouCan:  G86851RC
GlyCosmos:  G86851RC
GlyGen:  G86851RC
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG

Download Ideal Coordinates CCD File 
E [auth A],
F [auth A]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
TRS
Query on TRS

Download Ideal Coordinates CCD File 
K [auth L],
L
2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL
C4 H12 N O3
LENZDBCJOHFCAS-UHFFFAOYSA-O
SO4
Query on SO4

Download Ideal Coordinates CCD File 
G [auth A],
H [auth L]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
ZN
Query on ZN

Download Ideal Coordinates CCD File 
I [auth L],
J [auth L]
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.209 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 185.396α = 90
b = 69.342β = 112.76
c = 88.173γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling
MOLREPphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-10-16
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Structure summary
  • Version 2.1: 2023-08-30
    Changes: Data collection, Database references, Refinement description, Structure summary