Delta glutamate receptors are functional glycine- and ᴅ-serine-gated cation channels in situ.

Delta glutamate receptors are functional glycine- and ᴅ-serine-gated cation channels in situ.
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δ 谷氨酸受体是功能性甘氨酸和丝氨酸门控原位阳离子通道。

DOI:
10.1126/sciadv.abk2200
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发表时间:
2021-12-24
期刊:
影响因子:
13.6
通讯作者:
Jayaraman V
Jayaraman V
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Carrillo E;Gonzalez CU;Berka V;Jayaraman V

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突触蛋白小脑蛋白-1和神经毒素-1β允许离子通道激活德尔塔亚型的离子亲离子谷氨酸受体。Delta受体是离子型谷氨酸受体超家族的成员,通过与细胞外支架蛋白小脑-1和突触前跨膜蛋白Neuresin-1β相互作用形成跨突触连接。然而,与其他家族成员不同的是,在Delta受体中没有记录到直接的激动剂门控离子通道活动。在这里,我们表明,当与小脑蛋白-1和神经毒素-1β结合时,德尔塔受体的GluD2亚型形成阳离子选择性通道。通过荧光寿命测量和化学交联,我们揭示了GluD2氨基末端结构域的紧密堆积允许甘氨酸和d-丝氨酸诱导的通道开放。因此,小脑蛋白-1和神经红蛋白-1β作为生物交联剂稳定谷氨酸受体的胞外区,使其在突触中作为离子型兴奋性神经递质受体发挥作用。
The synaptic proteins cerebellin-1 and neurexin-1β permit ion channel activity in delta subtype of ionotropic glutamate receptors. Delta receptors are members of the ionotropic glutamate receptor superfamily and form trans-synaptic connections by interacting with the extracellular scaffolding protein cerebellin-1 and presynaptic transmembrane protein neurexin-1β. Unlike other family members, however, direct agonist-gated ion channel activity has not been recorded in delta receptors. Here, we show that the GluD2 subtype of delta receptor forms cation-selective channels when bound to cerebellin-1 and neurexin-1β. Using fluorescence lifetime measurements and chemical cross-linking, we reveal that tight packing of the amino-terminal domains of GluD2 permits glycine- and d-serine–induced channel openings. Thus, cerebellin-1 and neurexin-1β act as biological cross-linkers to stabilize the extracellular domains of GluD2 receptors, allowing them to function as ionotropic excitatory neurotransmitter receptors in synapses.
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