Ligand-binding domain of an α7-nicotinic receptor chimera and its complex with agonist.

Ligand-binding domain of an α7-nicotinic receptor chimera and its complex with agonist.
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DOI:
10.1038/nn.2908
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发表时间:
2011-09-11
影响因子:
25
通讯作者:
Chen L
Chen L
中科院分区:
医学1区
文献类型:
--
作者:
Li SX;Huang S;Bren N;Noridomi K;Dellisanti CD;Sine SM;Chen L

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α7乙酰胆碱受体(AChR)介导中枢神经系统的突触前和突触后神经传递,是神经退行性疾病、神经精神疾病和炎症性疾病的潜在治疗靶点。我们确定了由人α7 AChR和滞水菊乙酰胆碱结合蛋白(AChBP)构建的受体嵌合体细胞外结构域的晶体结构,该受体嵌合体与天然α7 AChR具有64%的序列同一性和71%的相似性。我们还确定了与绑定epibatidine,一个有效的AChR激动剂的结构。结构的比较揭示了介导激动剂识别和α7 AChRs信号转导早期步骤的分子重排和相互作用。这些结构进一步揭示了中央前庭内的负电荷环,准备对阳离子选择性做出贡献。结构导向突变研究揭示了α7 AChRs对激动剂识别和信号转导的独特贡献。这些结构为结构辅助药物设计和定义α7 AChR的结构-功能关系提供了一个现实的模板。
The α7 acetylcholine receptor (AChR) mediates pre- and postsynaptic neurotransmission in the central nervous system and is a potential therapeutic target in neurodegenerative, neuropsychiatric and inflammatory disorders. We determined the crystal structure of the extracellular domain of a receptor chimera constructed from the human α7 AChR and Lymnaea stagnalis acetylcholine binding protein (AChBP), which shares 64% sequence identity and 71% similarity with native α7. We also determined the structure with bound epibatidine, a potent AChR agonist. Comparison of the structures revealed molecular rearrangements and interactions that mediate agonist recognition and early steps in signal transduction in α7 AChRs. The structures further revealed a ring of negative charge within the central vestibule, poised to contribute to cation selectivity. Structure-guided mutational studies disclosed distinctive contributions to agonist recognition and signal transduction in α7 AChRs. The structures provide a realistic template for structure-aided drug design and for defining structure–function relationships of α7 AChRs.
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