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菌体Mu使用β滑动用于晚期基因转录
1Department of Molecular Biosciences and LaMontagne Center for Infectious Diseases, The University of Texas at Austin, Austin, TX 78712.
概括
菌体MuC蛋白 (MuC) 与大肠杆菌β滑动,对于DNA复制至关重要,相互作用以激活菌体转录. 这种相互作用对MuC至关重要.
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:
- 菌体 Mu C 蛋白 (MuC) 对于菌体晚期基因的转录至关重要,需要核心RNA聚合酶 (RNAP) 和 σ70.
- 在大肠杆菌中,MuC的过度表达是致命的,导致宿主复制过度启动.
- 抑制MuC致命性涉及调节DNA复制启动和终止 (dnaA,diaA,dnaX) 的基因.
研究的目的:
- 调查MuC引起致死性和激活转录的分子机制.
- 为了确定MuC与参与DNA复制的宿主因素的相互作用.
- 探索 MuC-Clamp 相互作用对转录调节的更广泛影响.
主要方法:
- 在大肠杆菌中对MuC杀伤性抑制剂的遗传分析.
- 在MuC中,可谓的Clamp-binding motif (CBM) 的位点定向突变发生.
- 在体内和体外测定以评估MuC依赖转录和MuC-Clamp相互作用.
- 贝塔滑动的温度敏感突变分析.
主要成果:
- MuC含有两个功能性CBM,对其致命性和转录活性至关重要.
- 同时表达Hda和DnaN (β-滑动) 挽救了MuC的致命性,表明MuC干扰了功能.
- MuC直接与大肠杆菌β滑动 (DnaN) 相互作用,激活菌体晚期基因转录.
- 贝塔滑动对于MuC-依赖的转录是必不可少的,但对于 σ70-依赖的转录不是.
结论:
- 菌体MuC劫持了必不可少的DNA复制过程性因素,即β滑动,以调节转录.
- 这项研究揭示了一个新的机制,其中复制因子被选择为转录调节.
- 在其他Mor/MuC家族蛋白质中发现CBM的存在表明,对转录的合是一种广泛的现象.
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