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Structural Mechanism of Functional Modulation by Gene Splicing in NMDA Receptors

机译:NMDA受体基因剪接功能调节的结构机制

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摘要

Alternative gene splicing gives rise toN-methyl-D-aspartate (NMDA) receptor ion channels with defined functional properties and unique contributions to calcium signaling in a given chemical environment in the mammalian brain. Splice variants possessing the exon-5-encoded motif at the amino-terminal domain (ATD) of the GluN1 subunit are known to display robustly altered deactivation rates and pH sensitivity, but the underlying mechanism for this functional modification is largely unknown. Here, we show through cryoelectron microscopy (cryo-EM) that the presence of the exon 5 motif in GluN1 alters the local architecture of heterotetrameric GluN1-GluN2 NMDA receptors and creates contacts with the ligand-binding domains (LBDs) of the GluN1 and GluN2 subunits, which are absent in NMDA receptors lacking the exon 5 motif. The unique interactions established by the exon 5 motif are essential to the stability of the ATD/LBD and LBD/LBD interfaces that are critically involved in controlling proton sensitivity and deactivation.
机译:替代基因剪接给予吨 - 甲基-D-天冬氨酸(NMDA)受体离子通道,其具有限定的功能性质和对哺乳动物脑中给定化学环境中的钙信号传导的独特贡献。已知具有在GLUN1亚基的氨基末端结构域(ATD)处具有外显子-5编码的基序的剪接变体显示出鲁棒地改变的去激活率和pH敏感性,但该功能改性的潜在机制在很大程度上是未知的。在这里,我们通过冷冻电子显微镜(Cryo-em)表示外显子5基序在Glun1中的存在改变了异淀粉的局部结构,并用GLUN1和GLUN2的配体结合结构域(LBD)产生触点在缺乏外显子5个主题的NMDA受体中不存在的亚基。由外显子5基序建立的独特交互对于ATD / LBD和LBD / LBD界面的稳定性至关重要,该稳定性涉及控制质子敏感性和去激活。

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