Interaction of IgE with Its High-Affinity Receptor

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Abstract
Structural interactions between IgE and its high-affinity receptor have been investigated with the methods of fluorescence resonance energy transfer and genetic engineering. The results indicate that IgE has a bent conformation when bound to receptor on the cell surface and that the site of interaction is contained in the Cε2 and Cε3 domains; the C-terminal domain, Cε4, is not required for binding. Cross-linking of IgE-receptor complexes is required for signal transduction across the plasma membrane. Binding studies with defined bivalent ligands indicate that structural and/or kinetic features determine the functional effectiveness of the cross-linked states.

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