NMDA receptor activation requires remodelling of intersubunit contacts within ligand-binding heterodimers.

NMDA receptor activation requires remodelling of intersubunit contacts within ligand-binding heterodimers.
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NMDA受体激活需要在配体结合异二聚体内重塑亚基间接触。

DOI:
10.1038/ncomms1512
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发表时间:
2011-10-11
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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两类谷氨酸激活通道介导中央突触的兴奋:N-甲基-d-天冬氨酸 (NMDA) 受体和非 NMDA 受体。尽管具有显着的结构同源性,但每一类都会产生具有特征动力学的信号并介导不同的突触功能。在非 NMDA 受体中,激动剂结合域内亚基间接触的强度与功能脱敏呈负相关。在这里,我们通过结合诱变和单通道电流分析来测试这些接触的强度如何影响 NMDA 受体激活。我们发现,由于开放障碍高和不稳定的开放状态,具有共价连接二聚体的受体的活性显着降低,但具有完整的脱敏作用。基于这些观察,我们认为,在 NMDA 受体中,异二聚体界面处的重排代表了开放序列的早期且完整的步骤,但不是脱敏所必需的。这些结果表明,NMDA 和非 NMDA 谷氨酸门控通道在激活很大程度上保守的亚基间接触方面具有不同的功能作用。
Two classes of glutamate-activated channels mediate excitation at central synapses: N-methyl-d-aspartic acid (NMDA) receptors and non-NMDA receptors. Despite substantial structural homology, each class generates signals with characteristic kinetics and mediates distinct synaptic functions. In non-NMDA receptors, the strength of inter-subunit contacts within agonist-binding domains is inversely correlated with functional desensitization. Here we test how the strength of these contacts affects NMDA receptor activation by combining mutagenesis and single-channel current analyses. We show that receptors with covalently linked dimers had dramatically lower activity due to high barriers to opening and unstable open states but had intact desensitization. Based on these observations, we suggest that in NMDA receptors rearrangements at the heterodimer interface represent an early and integral step of the opening sequence but are not required for desensitization. These results demonstrate distinct functional roles in the activation of NMDA and non-NMDA glutamate-gated channels for largely conserved inter-subunit contacts.
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