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Related Experiment Videos

Segmental flexibility of receptor-bound immunoglobulin E.

J Slattery, D Holowka, B Baird

    Biochemistry
    |December 17, 1985
    PubMed
    Summary

    Segmental flexibility of immunoglobulin E (IgE) is not significantly altered when bound to its high-affinity receptor. This finding challenges expectations of reduced movement upon receptor binding, suggesting inherent IgE flexibility.

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    Area of Science:

    • Immunology
    • Biophysics
    • Structural Biology

    Background:

    • Immunoglobulin E (IgE) plays a crucial role in allergic responses by binding to high-affinity receptors.
    • Understanding the structural dynamics of IgE upon receptor binding is essential for elucidating its function.

    Purpose of the Study:

    • To compare the segmental flexibility of mouse IgE in solution versus when bound to its high-affinity receptor.
    • To investigate the impact of receptor binding on IgE's conformational dynamics.

    Main Methods:

    • Utilized steady-state anisotropy measurements as a function of temperature and viscosity.
    • Employed fluorescently labeled monoclonal IgE (DNS-Lys and N-(1-pyrenyl)maleimide) to probe flexibility.
    • Studied IgE bound to membrane vesicles from rat basophilic leukemia cells.

    Main Results:

    • Receptor-bound IgE exhibited a slightly longer average rotational correlation time (phi = 74-89 ns) compared to IgE in solution (phi = 54 ns).
    • Labeling methods and IgE derivatives yielded consistent results, indicating the observed flexibility is characteristic of IgE.
    • The minimal change in rotational correlation time suggests that IgE remains conformationally flexible upon receptor binding.

    Conclusions:

    • The segmental flexibility of IgE is largely preserved upon binding to its high-affinity receptor.
    • These findings contrast with the expectation of significantly restricted movement for receptor-bound IgE.
    • IgE's inherent flexibility may be a key factor in its interaction with the receptor and subsequent signaling pathways.

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