AMPA受體與其輔助亞基cornichon的複合物結構獲解析
作者:
小柯機器人發布時間:2019/12/6 18:07:01
美國範德比爾特大學醫學院Terunaga Nakagawa報導了AMPA受體與其輔助亞基cornichon形成的複合物結構。2019年12月6日出版的《科學》發表了這項成果。
研究人員報導了AMPA型穀氨酸受體(AMPAR)與cornichon同源物(CNIH)複合的高解析度冷凍電子顯微鏡結構。與預期的膜拓撲結構相反,CNIH3缺少細胞外域,而是包含四個跨膜的螺旋。這揭示了決定通道調節的蛋白-蛋白相互作用界面和複合物周圍的脂質。這些結構提供了離子通道調節和AMPAR/CNIH3複合物組裝分子機制的見解。
據介紹,在大腦中,AMPAR與它們的輔助亞基形成複合物,並介導大多數快速興奮性神經傳遞。這些複合物轉導的信號對於突觸可塑性、學習和記憶至關重要。 AMPAR輔助亞基的兩個主要類別是跨膜AMPAR調節蛋白(TARP)和CNIH。這些亞基幾乎沒有同源性,並且在控制AMPAR的離子通道門控和運輸中起不同的作用。
附:英文原文
Title: Structures of the AMPA receptor in complex with its auxiliary subunit cornichon
Author: Terunaga Nakagawa
Issue&Volume: 2019/12/06
Abstract: In the brain, AMPA-type glutamate receptors (AMPARs) form complexes with their auxiliary subunits and mediate the majority of fast excitatory neurotransmission. Signals transduced by these complexes are critical for synaptic plasticity, learning, and memory. The two major categories of AMPAR auxiliary subunits are transmembrane AMPAR regulatory proteins (TARPs) and cornichon homologs (CNIHs); these subunits share little homology and play distinct roles in controlling ion channel gating and trafficking of AMPAR. Here, I report high-resolution cryo–electron microscopy structures of AMPAR in complex with CNIH3. Contrary to its predicted membrane topology, CNIH3 lacks an extracellular domain and instead contains four membrane-spanning helices. The protein-protein interaction interface that dictates channel modulation and the lipids surrounding the complex are revealed. These structures provide insights into the molecular mechanism for ion channel modulation and assembly of AMPAR/CNIH3 complexes.
DOI: 10.1126/science.aay2783
Source: https://science.sciencemag.org/content/366/6470/1259
Science:《科學》,創刊於1880年。隸屬於美國科學促進會,最新IF:41.037