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结合体特异性和道激活在昆虫口味受体的结构基础
Heather M Frank1, Sanket Walujkar1, Richard M Walsh2
1Department of Molecular and Cellular Biology, Harvard University, 52 Oxford Street, Cambridge, MA 02138, USA.
Cell reports
|April 4, 2024
概括
对果糖受体Bombyx mori Gr9 (BmGr9) 的结构洞察力揭示了其独特的联结口袋和封闭机制. 了解昆虫的味觉受体 (GRs) 有助于开发新的害虫控制策略.
科学领域:
- 昆虫的化学感应.
- 结构生物学是结构生物学.
- 味觉受体的分子机制.
背景情况:
- 味觉受体 (GRs) 对于昆虫的化学感应至关重要,并代表害虫和疾病载体控制的潜在目标.
- 对GR的结构性研究对于开发有针对性的应用至关重要.
研究的目的:
- 为了确定Bombyx mori Gr9 (BmGr9) 在无激素体和果糖结合状态中的结构.
- 阐明BmGr9.9中果糖结合和通道封闭的结构基础.
- 将BmGr9的结构特征与其他昆虫化学感知受体进行比较,例如气味受体 (OR).
主要方法:
- 进行X射线晶体学,以获得BmGr9.9的高分辨率结构.
- 生物化学分析以确认果糖结合和道活性.
- 基于结构的序列对齐,以确定保存的残留物和进化模式.
主要成果:
- BmGr9形成了一个四重体结构,类似于昆虫的气味受体 (OR).
- 果糖结合通过螺旋体S7b运动诱导通道开放.
- 与OR相比,BmGr9具有一个独特的,更大的,溶剂可访问的连接结口袋,涉及S5螺旋和芳香/极性残留物.
结论:
- 这项研究提供了详细的结构洞察力,了解BmGr9.9中果糖识别和隔离的分子基础.
- BmGr9的结合体结合口袋的独特结构特征表明昆虫GRs中的子家族特定的结合体相互作用.
- 这些发现提升了我们对GR联体特异性和功能的理解,为针对性害虫控制策略铺平了道路.
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