插入序列切除由一种催化分支迁移的蛋白质增强,并促进微同质介导的末端连接
Ren Kishino1, Takashi Saito1, Shuntaro Muto1
1Department of Life Science, Graduate School of Science, Rikkyo University, Tokyo, Japan.
Genes to cells : devoted to molecular & cellular mechanisms
|December 15, 2023
概括
插入序列 (IS) 切除增强剂 (IEE) 有助于在大肠杆菌O157.7中消除IS. IEE使用DNA依赖的ATPase和分支迁移活动来重塑DNA,促进IS切割的微同质介导末端连接.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
背景情况:
- 插入序列 (ISs) 是细菌基因组中发现的移动遗传元素.
- 肠出血性大肠杆菌O157使用IS切割增强剂 (IEE) 进行IS切除.
- 对IS切割的分子机制,特别是IEE的作用,还没有完全理解.
研究的目的:
- 阐明IEE促进大肠杆菌O157.7中IS切除的分子机制.
- 研究IEE的酶活性及其在IS转移和切除中的作用.
- 为了确定微同质介导端连接 (MMEJ) 在IEE依赖的IS切割中的参与.
主要方法:
- 在体外生化试验分析IEE的酶活性 (ATPase,分支迁移).
- 在IS切割产品中的重组位点的DNA序列分析.
- 构建和分析具有受损分支迁移或MMEJ活动的IEE突变.
- 在野生型和突变菌株中评估IS切割频率.
主要成果:
- IEE表现出DNA依赖的ATPase活性,由分支DNA结构激活.
- IEE催化了分叉结构DNA的分支迁移,这表明它在重塑IS转换中间体中的作用.
- 序列分析揭示了IS末端的微同源序列,这些末端参与切割.
- IEE促进了互补的3'-突出的DNA末端的微同质介导末端连接 (MMEJ).
- 缺乏分支迁移或MMEJ活动的突变体显著降低了IS切割频率.
结论:
- 通过重塑分支DNA结构和促进MMEJ,IEE在IS切除中发挥着关键作用.
- IEE的分支迁移和MMEJ活动对于高效的IS减税至关重要.
- 提出了一种IEE和转化酶触发的IS切除模型,将DNA重塑和修复途径整合在一起.
关键词:
在DNA重组的过程中,DNA重组.埃舍里希亚大肠杆菌 (Escherichia coli) 是一个大肠杆菌.这是一种IS-切割增强剂.分支机构迁移移迁移分支机构迁移插入序列的插入序列.微同质学的微同质学更多相关视频
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