Intersubunit interactions at putative sites of ethanol action in the M3 and M4 domains of the NMDA receptor GluN1 and GluN2B subunits.

Intersubunit interactions at putative sites of ethanol action in the M3 and M4 domains of the NMDA receptor GluN1 and GluN2B subunits.
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NMDA 受体 GluN1 和 GluN2B 亚基 M3 和 M4 结构域中乙醇作用推定位点的亚基间相互作用。

DOI:
10.1111/bph.13487
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发表时间:
2016
影响因子:
7.3
通讯作者:
Peoples,RW
Peoples,RW
中科院分区:
医学2区
文献类型:
--
作者:
Zhao,Y;Ren,H;Peoples,RW

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背景与目的NMDA受体是酒精作用于脑内的重要靶点。该实验室最近的研究表明,GluN 1和GluN 2A亚基的M3和M4结构域的亚基间界面中的酒精敏感位置与酒精敏感性和受体动力学相互作用,GluN 2A和GluN 2B亚基的M结构域中的酒精敏感位置不同。在本研究中,我们测试了GluN 1/GluN 2B NMDA受体中M结构域亚基间界面处的酒精敏感位置之间的相互作用。实验方法我们在表达GluN 1和GluN 2B NMDA受体亚基中乙醇敏感位置处的色氨酸取代突变体的tsA 201细胞中使用全细胞膜片钳记录来测试位置之间的相互作用。关键结果GluN 1/GluN 2B NMDA受体亚基中的六对位置,GluN 2B对乙醇的抑制有显著的交互作用:Gly 638/Met 824、Gly 638/Leu 825、Phe 639/Leu 825、Phe 639/Gly 826、Met 818/Phe 637和Val 820/Phe 637。GluN 2B中Met 824或Leu 825处的色氨酸取代不会改变乙醇敏感性,但会与GluN 1 M3结构域中的位置相互作用以调节乙醇作用,而Gly 638处的色氨酸取代(GluN 2A中乙醇敏感位置的同源物)不会改变乙醇敏感性或与GluN 1中的位置相互作用。两对和三对位置相互作用,分别调节谷氨酸稳态和峰值电流EC 50,和一对相互作用相对于宏观desensitization.ConclusionsDespite高度保守的M结构域序列和相似的乙醇敏感性的GluN 2A和GluN 2B亚基,这些亚基相互作用的方式与GluN 1亚基调节乙醇敏感性和受体动力学不同。
Background and PurposeThe NMDA receptor is an important target of alcohol action in the brain. Recent studies in this laboratory have demonstrated that alcohol‐sensitive positions in the intersubunit interfaces of the M3 and M4 domains of GluN1 and GluN2A subunits interact with respect to ethanol sensitivity and receptor kinetics and that alcohol‐sensitive positions in the M domains of GluN2A and GluN2B subunits differ. In this study, we tested for interactions among alcohol‐sensitive positions at the M domain intersubunit interfaces in GluN1/GluN2B NMDA receptors.Experimental ApproachWe used whole‐cell patch‐clamp recording in tsA201 cells expressing tryptophan substitution mutants at ethanol‐sensitive positions in the GluN1 and GluN2B NMDA receptor subunits to test for interactions among positions.Key ResultsSix pairs of positions in GluN1/GluN2B significantly interacted to regulate ethanol inhibition: Gly638/Met824, Gly638/Leu825, Phe639/Leu825, Phe639/Gly826, Met818/Phe637and Val820/Phe637. Tryptophan substitution at Met824or Leu825in GluN2B did not alter ethanol sensitivity but interacted with positions in the GluN1 M3 domain to regulate ethanol action, whereas tryptophan substitution at Gly638, which is the cognate of an ethanol‐sensitive position in GluN2A, did not alter ethanol sensitivity or interact with positions in GluN1. Two and three pairs of positions interacted to regulate glutamate steady‐state and peak current EC50, respectively, and one pair interacted with respect to macroscopic desensitization.ConclusionsDespite highly‐conserved M domain sequences and similar ethanol sensitivity in the GluN2A and GluN2B subunits, the manner in which these subunits interact with the GluN1 subunit to regulate ethanol sensitivity and receptor kinetics differs.
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