结构和功能特征MrpR,主抑制剂的细菌细菌的prophageSPββ
Katharina Kohm1,2, Ekaterina Jalomo-Khayrova3, Aileen Krüger4
1FG Synthetic Microbiology, Institute for Biotechnology, BTU Cottbus-Senftenberg, Senftenberg, Germany.
Nucleic acids research
|August 21, 2023
概括
这种SPβ的prophage.
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,特别是菌体,表现出动态的生活方式,在 lysogeny 和 lytic 周期之间切换.
- 细菌细菌SPβ原体的 lysogenic 状态由MrpR (YopR) 蛋白调节,这是 lysis-lysogeny 决策中的一个关键元素.
- 了解这种调节是控制菌体行为和宿主菌体相互作用的关键.
研究的目的:
- 调查MrpR蛋白在SPβ预原体的溶解-溶解决定中的作用.
- 描述mrpR基因中对温度敏感突变的结构和功能影响.
- 为了确定参与SPβ先导体的性循环诱导的新型组件.
主要方法:
- 使用一种热敏的SPβ c2突变菌株 Bacillus subtilis.
- 使用MrpR蛋白质的结构特征.
- 执行MrpR DNA 结合活性的全基因组概况.
- 进行抑制剂突变分析以确定新的调节因素.
主要成果:
- 在mrpR基因中的单个核酸交换赋予了MrpRG136E蛋白的温度敏感性,在热处理时诱导SPβ c2溶解周期.
- 结构分析显示MrpR是一种DNA结合蛋白,与功能性氨酸重组酶不同,由于G136E突变导致DNA结合受损.
- MrpR充当主抑制剂,与SPbeta重复元件 (SPBRE) 结合,以维持溶解发生.
- SPβ c2 的热诱导切除取决于血清复合酶 SprA.
- 通过抑制剂突变分析确定了一种对SPβ溶解周期诱导至关重要的新型成分.
结论:
- MrpR蛋白质是SPβ溶解发生的主抑制剂,与SPBRE结合,以保持集成状态.
- 对温度敏感的MrpRG136E突变破坏了MrpR的结构和DNA结合,从而使热引起的prophage激活.
- 这项研究揭示了一种对SPβ益诱导至关重要的新因素,扩大了我们对菌体调节网络的理解.
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