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
Sutton BJ
中科院分区:
生物学1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

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在所有抗体类别中,IgE 显示出与其细胞表面受体 FcεRI 的独特缓慢解离速率和高亲和力。 IgE 介导过敏性超敏反应能力的这些关键决定因素的结构基础现已通过与 FcεRI α 链胞外域结合的人 IgE-Fc(由 Cε2、Cε3 和 Cε4 域组成)的 3.4Å 分辨率晶体结构揭示。与游离 IgE-Fc(此处报告为 1.9Å)的比较表明,在受体结合之前具有紧凑弯曲结构的抗体在复合物中变得更加急剧弯曲。热力学分析表明,相互作用是熵驱动的,这解释了非接触式 Cε2 结构域如何代替 IgG 抗体的柔性铰链区,与构象变化共同促进 IgE 独特的结合特性。
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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