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Ligand-receptor interactions within the plane of the plasma membrane play a pivotal role for transmembrane signaling. The biophysical principles of protein-protein interactions on lipid bilayers, though, have hardly been experimentally addressed. We have dissected the interactions involved in ternary complex formation by ligand-induced cross-linking of the subunits of the type I interferon (IFN) receptors...
We describe an experimental approach for studying ligand-receptor interactions in the plane of the membrane. The extracellular domains of the type I interferon receptor subunits ifnar1-EC and ifnar2-EC were tethered in an oriented fashion onto solid-supported, fluid lipid bilayers, thus mimicking membrane anchoring and lateral diffusion of the receptor. Ligand-induced receptor assembling was investigated...
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