On the nature of partial agonism in the nicotinic receptor superfamily.

On the nature of partial agonism in the nicotinic receptor superfamily.
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DOI:
10.1038/nature07139
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发表时间:
2008-08-07
期刊:
影响因子:
64.8
通讯作者:
Sivilotti, Lucia G.
Sivilotti, Lucia G.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Lape, Remigijus;Colquhoun, David;Sivilotti, Lucia G.

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部分激动剂是与受体结合的配体,但即使在所有受体都被占据的浓度下也仅产生较小的最大响应。就配体激活的离子通道而言,自 1957 年以来,人们一直认为部分激动剂会引起较小的反应,因为它们不能有效地引发通道关闭和开放状态之间的构象变化。我们研究了烟碱超家族的两个成员,即肌肉烟碱乙酰胆碱受体和甘氨酸受体的部分激动剂,发现完全激动剂和部分激动剂的开闭反应相似,但对部分激动剂的反应受到通道仍关闭时发生的早期构象变化(“翻转”)的限制。这对于结构研究的解释以及未来用于治疗用途的部分激动剂的设计具有影响。
Partial agonists are ligands which bind to receptors but produce only a small maximum response even at concentrations where all receptors are occupied. In the case of ligand-activated ion channels, it has been supposed ever since 1957 that partial agonists evoke a small response because they are inefficient at eliciting the change of conformation between shut and open states of the channel. We have investigated partial agonists for two members of the nicotinic superfamily, the muscle nicotinic acetylcholine receptor and the glycine receptor and find that the open-shut reaction is similar for both full and partial agonists, but the response to partial agonists is limited by an earlier conformation change (‘flipping’) that takes place while the channel is still shut. This has implications for the interpretation of structural studies, and in the future, for the design of partial agonists for therapeutic use.
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