Conformational changes in IgE contribute to its uniquely slow dissociation rate from receptor FcɛRI.
Conformational changes in IgE contribute to its uniquely slow dissociation rate from receptor FcɛRI.
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DOI:
10.1038/nsmb.2044
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发表时间:
2011-05
影响因子:
16.8
通讯作者:
Sutton BJ
中科院分区:
文献类型:
--
作者:
Holdom MD;Davies AM;Nettleship JE;Bagby SC;Dhaliwal B;Girardi E;Hunt J;Gould HJ;Beavil AJ;McDonnell JM;Owens RJ;Sutton BJ
Of all the antibody classes, IgE displays a uniquely slow dissociation rate from, and high affinity for, its cell surface receptor FcεRI. The structural basis for these key determinants of IgE’s ability to mediate allergic hypersensitivity is now revealed by the 3.4Å resolution crystal structure of human IgE-Fc (consisting of the Cε2, Cε3 and Cε4 domains) bound to the extracellular domains of the FcεRI α-chain. Comparison with free IgE-Fc (reported here at 1.9Å) shows that the antibody, which has a compact, bent structure prior to receptor engagement, becomes even more acutely bent in the complex. Thermodynamic analysis indicates that the interaction is entropically driven, which explains how the non-contacting Cε2 domains, in place of the flexible hinge region of IgG antibodies, contribute together with the conformational changes to IgE’s unique binding properties.
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DOI:
10.1107/s0907444904019158
发表时间:
2004-12-01
影响因子:
2.2
作者:
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通讯作者:
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影响因子:
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影响因子:
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作者:
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通讯作者:
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影响因子:
64.5
作者:
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