COMEC域之间的分子相互作用允许在自然转化过程中选择性降解非转移链
Matthew J M Stedman1, Sophie Deselaers1, Sebastian A G Braus1
1Institute of Molecular Biology and Biophysics, Department of Biology, ETH Zürich, Otto-Stern-Weg 5, 8093 Zürich, Switzerland.
Nucleic acids research
|September 23, 2025
概括
自然有能力的细菌使用ComEC进行DNA吸收,这对于抗生素耐药性传播至关重要. 这项研究揭示了ComEC.
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:
- 自然转化使细菌能够获得环境DNA,促进横向基因转移.
- 这一过程对于抗生素耐药性基因在包括病原体在内的细菌群体中传播至关重要.
- 在自然转化过程中,ComEC是一种必不可少的蛋白质复合体,负责将DNA穿过细菌细胞质膜.
研究的目的:
- 阐明COMEC在DNA结合,降解和转移中的结构和功能机制.
- 描述ComECβ-lactamase-like域的核酶活性及其OB折叠的DNA结合活性.
- 提供基于生物化学和结构数据的COMEC功能机制模型.
主要方法:
- 高分辨率的COMEC域的结构确定.
- 生物化学测试以表征核酶活性.
- 功能性测试用于评估DNA结合和转位.
- 蛋白质-DNA相互作用的体外表征.
主要成果:
- 确定了COMECOB折叠和β-乳糖酶样域的高分辨率结构.
- 类似β-乳酸酶域的核酶活性由OB的存在增强.
- 在β-lactamase-like域中的一个特定循环和在DNA通道上的芳香残留物被确定为DNA处理的关键.
- 提出了一个COMEC介导的DNA结合,降解和转位的模型.
结论:
- 康埃克利用不同的领域和结构特征来管理转换DNA.
- OB和β-乳糖酶样域之间的相互作用对于高效的DNA处理至关重要.
- 这些发现为ComEC通过细菌膜的DNA转移提供了详细的机制理解.
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