在Sinorhizobium meliloti中的化疗受体需要最小的五链来提供适应性辅助
Alfred Agbekudzi1, Birgit E Scharf1
1Department of Biological Sciences, Life Sciences I, Virginia Tech, Blacksburg, Virginia, USA.
Molecular microbiology
|May 27, 2024
概括
Sinorhizobium meliloti使用一个五基因为细菌化学反应适应. 这个系统增强了适应蛋白与化疗受体的结合,这对于感知化学信号至关重要.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 细菌化学反应依赖于感官适应.
- 甲基接受化学反应蛋白 (MCPs) 是关键参与者,经过翻译后被修改.
- 在大肠杆菌中,适应蛋白CheR和CheB与MCP上的C终端五基因相互作用.
研究的目的:
- 调查Sinorhizobium meliloti化学反应中五基因 (N/D) WE(E/N) F的功能.
- 确定这种基因在调解与适应蛋白CheR和CheB的相互作用中的作用.
- 探索S. meliloti.对化学受体功能和适应性的更广泛影响.
主要方法:
- 异热定位热量计 (ITC) 用于测量结合亲缘关系.
- 在MCP五基因的部位定向突变发生.
- 对野生型和突变菌株中各种吸引剂的化学作用的表型分析.
- 功能性测试涉及五基因与缺乏五基因的化学受体的融合.
主要成果:
- 与未经修改的CheB相比,五对CheR和激活的CheB表现出更强的结合亲和力.
- 在MCP五的保守型素的突变显著损害了对多种吸引物的化学反应.
- 五基因基因在通过链接器与缺乏五基因的化疗受体融合时赋予了化疗作用.
- S. meliloti 使用五依赖的适应系统,与大肠杆菌相比,其结合单元较少.
结论:
- 五基因对S. meliloti的化学反应适应是必不可少的.
- 这种图案促进了适应蛋白与化学传感阵列的高效对接.
- S. meliloti的适应系统是强大的,可能由更高的CheR和CheB丰度支持.
- 这些发现揭示了细菌感官适应的保存但适应性的机制.
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