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Updated: Jun 14, 2025

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通过小鼠微量氨基关联受体TAAR7f对气味物的分子识别

Anastasiia Gusach¹, Yang Lee¹, Armin Nikpour Khoshgrudi^2,3

¹MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge, CB2 0QH, UK.

Nature communications

|August 30, 2024

概括

研究人员绘制了与特定气味剂结合的小鼠微量胺相关受体 (TAAR7f) 的结构. 这揭示了TAARs如何识别气味分子,为嗅觉信号提供了洞察力.

科学领域:

生物化学生物化学
结构生物学结构生物学
神经科学是一个神经科学.

背景情况:

两个主要的G蛋白结合受体家族,气味受体 (ORs) 和微量胺相关受体 (TAARs),检测气味.
TAARs与氨基酶受体 (上腺素,血清素,多巴胺,组胺) 有相似之处.

研究的目的:

确定TAARs中连接体识别的结构基础.
阐明小鼠TAAR7f受体,Gs蛋白和气味剂N,N-二甲基环胺 (DMCHA) 之间的相互作用.

主要方法:

低温电子显微镜 (cryo-EM) 用于确定与Gs和DMCHA结合的mTAAR7f的结构.
变异性研究和分子动力学模拟以分析受体激活.

主要成果:

mTAAR7f-Gs-DMCHA复合体的冷-EM结构被解析为2.9 Å.
通过范德瓦尔斯和充电-充电相互作用与酸残留物,DMCHA与疏水部位结合.
结合部位与OR51E2.2.中的气味酸盐的结合部位不同.
受体激活机制类似于β-上腺受体,DMCHA与Trp6.48微开关残留物直接相互作用.

结论:

这项研究为TAAR联结体识别提供了第一个结构性见解.
确定了TAARs的关键相互作用和独特的绑定位置.
揭示了一种独特的激活通路,涉及与微开关残留物直接相互作用,不同于正规的氨基酶受体通路.

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