相关实验视频
Updated: Jun 10, 2025

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Substrate Generation for Endonucleases of CRISPR/Cas Systems
Published on: September 8, 2012
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与CRISPR相关的Cas蛋白的分类学分布,遗传学关系和域保护
Weerakkody Ranasinghe1, Dorcie Gillette2, Alexis Ho1
1Department of Biological Sciences, Sam Houston State University, Huntsville, TX, USA.
Bioinformatics and biology insights
|October 14, 2024
概括
克里斯普尔-卡斯蛋白 (Cas3,Cas9和Cas10) 迅速进化,保存方式不同. 在负选择下,Cas3和Cas9显示保存域,而Cas10显示中性或正性选择,表明快速分歧.
科学领域:
- 微生物学 微生物学
- 遗传学 遗传学 是一个
- 进化生物学 进化生物学
背景情况:
- 克里斯普尔 (Clustered Regularly Interspaced Short Palindromic Repeats) 是一种细菌的防御系统,它可以对细菌进行抗击.
- 克里斯普尔系统 (I,II,III型) 使用特征蛋白Cas3,Cas9和Cas10.
- 这些蛋白质可能由于各种选择性压力而迅速进化.
研究的目的:
- 分析Cas3,Cas9和Cas10蛋白质的进化分布,系系和结构功能约束.
- 了解关键的CRISPR相关蛋白质的进化动态.
主要方法:
- 同类蛋白质的基因组分析.同类蛋白质的基因组分析.
- 卡斯蛋白家族的遗传学分析.
- 结构功能约束分析.
主要成果:
- Cas3, Cas9 和 Cas10 在 Bacteroidetes, Firmicutes 和 Proteobacteria 中普遍存在.
- 蛋白质共享30-50%的氨基酸特征,表明了快速的进化.
- 在负选择下,Cas3和Cas9具有保存域;Cas10域显示中性/正性选择.
结论:
- 与CRISPR相关的蛋白质表现出不同的进化轨迹.
- Cas3和Cas9更保守,这表明有功能限制.
- Cas10的快速分歧意味着结构功能约束不那么严格.
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