工程人类P2X2受体与改变了酵母酵母的配体选择性
Elizabeth C Gardner1, Caitlin Tramont1, Petra Bachanová1
1Department of Molecular Biosciences, Center for Systems and Synthetic Biology, The University of Texas at Austin, Austin, Texas, USA.
The Journal of biological chemistry
|March 31, 2024
概括
研究人员对酵母中的P2X2受体进行了改造,创造了一种对AMP-PNP具有改变连接体选择性的突变物. 这种基于酵母的系统为离子通道工程和表征提供了一个可扩展的平台.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 生物物理学的生物物理.
背景情况:
- P2X受体是关联离子通道,在各种生物过程中至关重要.
- 这些受体在许多物种中存在,但在酵母 (Saccharomyces cerevisiae) 中自然存在.
- 用于离子通道研究的哺乳动物表达系统通常是昂贵和耗时的.
研究的目的:
- 为了在面包酵母中实现人类P2X2受体的第一个重组表达和功能性门.
- 用酵母作为宿主来有效地对P2X2受体突变体进行基因查和工程.
- 为了设计P2X2变体,改变了连接体选择性和封闭性质.
主要方法:
- 在酵母Saccharomyces cerevisiae中的P2X2受体上进行了位点和突变发生.
- 使用深度突变分析来识别影响受体功能的关键残留物.
- 工程酵母系统促进了P2X2受体变体的功能性特征.
主要成果:
- 这项研究成功地表达和功能性地关闭了酵母中的P2X2受体.
- 一个突变的P2X2受体 (F303Y A304W) 经过工程设计,对ATP模拟物AMP-PNP具有改变的选择性.
- 在F303Y A304W变体中,细胞内幅度增加了100倍以上,AMP-PNP的敏感性降低了.
结论:
- 贝克酵母为离子通道表征和工程提供了一个可扩展和具有成本效益的平台.
- 工程P2X2受体变体显示出化学遗传细胞控制应用的潜力.
- A304W突变对无敏状态的不稳定提供了对受体门与次优激动剂的机械洞察力.
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