除了PPR-RNA识别代码之外:许多方面对RNA编辑因子PPR56的多重定位特性具有重要意义
Yingying Yang1, Kira Ritzenhofen1, Jessica Otrzonsek1
1IZMB-Institut für Zelluläre und Molekulare Botanik, Abteilung Molekulare Evolution, Universität Bonn, Bonn, Germany.
PLoS genetics
|August 21, 2023
概括
的Physcomitrium patens PPR56蛋白有效编辑大肠杆菌中的线粒体RNA,揭示了100多个目标之外的编辑. 修改提高了编辑效率,为RNA编辑机制提供了洞察力.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 遗传学 是一个遗传学.
背景情况:
- 线粒体C-to-URNA编辑对于植物的基因表达至关重要.
- 来自Physcomitrium patens的PPR56蛋白含有DYW类型的cytidine deaminase域.
- 大肠杆菌中的异质表达允许研究RNA编辑因子.
研究的目的:
- 研究PR56RNA编辑活动的机制基础.
- 在细菌系统中通过PPR56调解的非目标RNA编辑事件的特征.
- 探索提高RNA编辑效率和特异性的策略.
主要方法:
- 在大肠杆菌中表达PPR56的表达.
- 使用转录组方法分析本地和非目标RNA编辑站点.
- PPR56蛋白和点RNA序列的局部定向突变发生.
- 工程 PPR56 变体用于改变目标特异性.
- 在大型mRNA上配对和末端附加的目标配置.
主要成果:
- PPR56在本地目标 (nad3,nad4) 上表现出高保真度,但也在大肠杆菌中诱导了100多个非目标C-to-U编辑.
- 单独和组合修改的PPR56和目标调节编辑活动.
- 工程PPR56变种显示了改变的目标特异性.
- 将目标放在并列或mRNA末端可以加强弱点的编辑,将cox3确定为新的候选目标.
结论:
- 细菌系统适合对PPR56.6进行机理学研究.
- 在直接的PPR结合部位之外的转录特征可以增强RNA编辑.
- 通过蛋白质和向工程来调节PPR56活性,以实现潜在的应用.
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