Trapping IgE in a closed conformation by mimicking CD23 binding prevents and disrupts FcεRI interaction.

Trapping IgE in a closed conformation by mimicking CD23 binding prevents and disrupts FcεRI interaction.
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DOI:
10.1038/s41467-017-02312-7
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发表时间:
2018-01-02
影响因子:
16.6
通讯作者:
Spillner E
Spillner E
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Jabs F;Plum M;Laursen NS;Jensen RK;Mølgaard B;Miehe M;Mandolesi M;Rauber MM;Pfützner W;Jakob T;Möbs C;Andersen GR;Spillner E

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Anti-IgE therapeutics interfere with the ability of IgE to bind to its receptors on effector cells. Here we report the crystal structure of an anti-IgE single-domain antibody in complex with an IgE Fc fragment, revealing how the antibody inhibits interactions between IgE and the two receptors FcεRI and CD23. The epitope overlaps only slightly with the FcεRI-binding site but significantly with the CD23-binding site. Solution scattering studies of the IgE Fc reveal that antibody binding induces a half-bent conformation in between the well-known bent and extended IgE Fc conformations. The antibody acts as functional homolog of CD23 and induces a closed conformation of IgE Fc incompatible with FcεRI binding. Notably the antibody displaces IgE from both CD23 and FcεRI, and abrogates allergen-mediated basophil activation and facilitated allergen binding. The inhibitory mechanism might facilitate strategies for the future development of anti-IgE therapeutics for treatment of allergic diseases. IgE is linked to allergic diseases and there is a great interest in developing anti-IgE therapeutics. Here the authors characterize the binding of human IgE Fc to a single domain antibody (sdab) and show that the sdab induces a closed conformation, which prevents and disrupts IgE binding to its receptor FcεRI and abrogates allergen mediated activation.
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