5GNI

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.008 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.221 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

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: 10.1038/srep38655

  • 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 junc ...

    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

    Department of Biology and Shenzhen Key Laboratory of Cell Microenvironment, Southern University of Science and Technology, Shenzhen 518055, China.,School of Biomedical Sciences, University of Hong Kong, Laboratory Block, 21 Sassoon Road, Pokfulam, Hong Kong, China.,Biology Department, Brookhaven National Laboratory, Upton, NY 11973, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Platelet endothelial cell adhesion molecule
A, B
213Homo sapiensMutation(s): 3 
Gene Names: PECAM1
Find proteins for P16284 (Homo sapiens)
Go to Gene View: PECAM1
Go to UniProtKB:  P16284
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.008 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.221 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 60.522α = 90.00
b = 141.496β = 90.00
c = 169.918γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
PHASERphasing
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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