在Chloroflexota系细菌中功能性古细胞的结构
Shamphavi Sivabalasarma1,2, Najwa Taib3,4, Clara L Mollat1
1Faculty of Biology, Molecular Biology of Archaea, University of Freiburg, Freiburg, Germany.
Nature microbiology
|September 17, 2025
概括
考古物 (Archaea) 是一种古老的物种.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 考古物中的运动是由archaellum驱动的,这是一个由ATP驱动的旋转电机.
- 以前,人们认为菌只存在于古物种中.
- 最近的发现表明,SAR202类 (Chloroflexota) 的细菌菌株中的古细胞基因.
研究的目的:
- 为了研究在Chloroflexota中古细胞基因集群的存在和功能.
- 为了确定细菌archaella的结构和组装.
- 为了了解细菌中archaella的进化起源.
主要方法:
- MacSyFinder分析以确定古基因集群.
- 用于结构预测的AlphaFold3.
- 低温电子显微镜单颗粒分析用于高分辨率的结构确定.
- 为了获得进化见解而进行的基因组学分析.
主要成果:
- 真正的archaellum基因集群在Chloroflexota中广泛存在.
- 细菌中的archaellum结构与考古机械有相似之处.
- 来自Litorilinea aerophila的细菌古在结构上被分解为2.7 Å.
- 通过细菌archaellum介导的表达,组装和功能性游泳机动性得到了证明.
- 遗传学分析发现了从Euryarchaeota到Chloroflexota的两个水平基因转移事件.
结论:
- 在细菌 (Chloroflexota) 中存在并组装了一个功能性的古细胞机器.
- 水平基因转移促进了古细胞和细菌之间古细胞机械的交换.
- 这项研究证明了复杂的运动器官的域间交换.
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