The crystal structure of PECAM-1 IgL1-2 trans-homophilic dimer

Experimental Data Snapshot

  • Resolution: 3.01 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.223 

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Structural Basis for Human PECAM-1-Mediated Trans-homophilic Cell Adhesion

Hu, M.Zhang, H.Liu, Q.Hao, Q.

(2016) Sci Rep 6: 38655-38655

  • DOI: https://doi.org/10.1038/srep38655
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Cell adhesion involved in signal transduction, tissue integrity and pathogen infection is mainly mediated by cell adhesion molecules (CAM). One CAM member, platelet-endothelial-cell adhesion molecule-1 (PECAM-1), plays an important role in tight junction among endothelia cells, leukocyte trafficking, and immune response through its homophilic and heterophilic binding patterns. Both kinds of interactions, which lead to endogenous and exogenous signal transmission, are derived from extracellular immunoglobulin-like (IgL) domains and cytoplasmic immunoreceptor tyrosine-based inhibitory motifs (ITIMs) of PECAM-1. To date, the mechanism of trans-homophilic interaction of PECAM-1 remains unclear. Here, we present the crystal structure of PECAM-1 IgL1-2 trans-homo dimer. Both IgL 1 and 2 adopt the classical Ig domain conformation comprised of two layers of β-sheets possessing antiparallel β-strands with each being anchored by a pair of cysteines forming a disulfide bond. The dimer interface includes hydrophobic and hydrophilic interactions. The Small-Angle X-ray Scattering (SAXS) envelope of PECAM-1 IgL1-6 supported such a dimer formation in solution. Cell adhesion assays on wildtype and mutant PECAM-1 further characterized the structural determinants in cell junction and communication.

  • Organizational Affiliation

    School of Biomedical Sciences, University of Hong Kong, Laboratory Block, 21 Sassoon Road, Pokfulam, Hong Kong, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Platelet endothelial cell adhesion molecule
A, B
213Homo sapiensMutation(s): 3 
Gene Names: PECAM1
UniProt & NIH Common Fund Data Resources
Find proteins for P16284 (Homo sapiens)
Explore P16284 
Go to UniProtKB:  P16284
PHAROS:  P16284
GTEx:  ENSG00000261371 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP16284
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.01 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.223 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 60.522α = 90
b = 141.496β = 90
c = 169.918γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-12-21
    Type: Initial release
  • Version 1.1: 2017-02-01
    Changes: Database references