在有能力的Bacillus subtilis细胞中细胞内蛋白质和DNA动态
Dawit Kidane1, Peter L Graumann
1Institut für Mikrobiologie, Fachbereich Biologie II, Universität Freiburg, Verfügungsgebäude, Stefan-Meier-Str. 19, 79104 Freiburg, Germany.
Cell
|July 13, 2005
概括
在Bacillus subtilis中,DNA修复蛋白RecA和RecN在有能力的细胞中显示出明显的极性定位. 在这里,我们可以看到RecN RecN.
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 是一个遗传学.
背景情况:
- 细菌能力包括吸收外部DNA进行遗传转变.
- DNA修复和重组蛋白在整合外来DNA中起着至关重要的作用.
- 蛋白质的细胞局部化对于高效的生物过程至关重要.
研究的目的:
- 研究DNA修复蛋白RecA和RecN在Bacillus subtilis有能力的细胞中的定位和动态.
- 阐明能力因素和外部DNA在ReCA和ReCN的局部化中的作用.
- 了解自然转化过程中单链DNA (ssDNA) 处理的机制.
主要方法:
- 显微镜观察活生生的Bacillus subtilis细胞中的蛋白质定位.
- 基因操纵以评估RecN和RecA本地化对能力因素 (ComGA,ComK) 的依赖性.
- 生物化学试验研究 RecN 蛋白与 ssDNA 的相互作用.
主要成果:
- 在细胞极点与能力蛋白ComGA共聚的ReCA蛋白,依赖于ComGA和ComK.
- RecN蛋白在细胞极之间表现出动态振荡,独立于能力因素.
- 在外部DNA添加时,recN振荡停止,表明ssDNA相互作用.
- 纯化的Recn证明了依赖ATP的ssDNA结合.
- 外部DNA诱导了来自能力机器的ReCA线索形成.
结论:
- 有能力的 Bacillus subtilis 细胞在细胞极处具有动态的 ssDNA 结合装置.
- 这种装置,涉及ReCA和ReCN,有助于吸收和处理外部ssDNA进行重组.
- 蛋白质局部化和动态是转化过程中外来DNA有效整合的关键.
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