A comparative molecular force spectroscopy study of homophilic JAM-A interactions and JAM-A interactions with reovirus attachment protein sigma1.

Vedula SR, Lim TS, Kirchner E, Guglielmi KM, Dermody TS, Stehle T, Hunziker W, Lim CT
J Mol Recognit. 2008 21 (4): 210-6

PMID: 18446885 · PMCID: PMC4827770 · DOI:10.1002/jmr.886

JAM-A belongs to a family of immunoglobulin-like proteins called junctional adhesion molecules (JAMs) that localize at epithelial and endothelial intercellular tight junctions. JAM-A is also expressed on dendritic cells, neutrophils, and platelets. Homophilic JAM-A interactions play an important role in regulating paracellular permeability and leukocyte transmigration across epithelial monolayers and endothelial cell junctions, respectively. In addition, JAM-A is a receptor for the reovirus attachment protein, sigma1. In this study, we used single molecular force spectroscopy to compare the kinetics of JAM-A interactions with itself and sigma1. A chimeric murine JAM-A/Fc fusion protein and the purified sigma1 head domain were used to probe murine L929 cells, which express JAM-A and are susceptible to reovirus infection. The bond half-life (t(1/2)) of homophilic JAM-A interactions was found to be shorter (k(off)(o) = 0.688 +/- 0.349 s(-1)) than that of sigma1/JAM-A interactions (k(off)(o) = 0.067 +/- 0.041 s(-1)). These results are in accordance with the physiological functions of JAM-A and sigma1. A short bond lifetime imparts a highly dynamic nature to homophilic JAM-A interactions for regulating tight junction permeability while stable interactions between sigma1 and JAM-A likely anchor the virus to the cell surface and facilitate viral entry.

John Wiley & Sons, Ltd

MeSH Terms (13)

Animals Cell Adhesion Molecules Kinetics L Cells Mice Microscopy, Atomic Force Multiprotein Complexes Orthoreovirus, Mammalian Protein Interaction Domains and Motifs Protein Structure, Tertiary Receptors, Cell Surface Recombinant Fusion Proteins Viral Nonstructural Proteins

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