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Updated: Jul 8, 2025

An Assay for Quantifying Protein-RNA Binding in Bacteria
Published on: June 12, 2019
菌体抗CBASS蛋白同时隔离循环三核酸和二核酸
Xueli Cao1, Yu Xiao2, Erin Huiting3
1Beijing Advanced Innovation Center for Soft Matter Science and Engineering, State Key Laboratory of Chemical Resource Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China.
菌体Acb2蛋白通过结合周期性二核酸 (CDN) 和周期性三核酸 (CTN) 来抑制基于周期性寡核酸的抗菌体信号系统 (CBASS). 这种广谱抑制可以防止CBASS介导的免疫力.
科学领域:
- 分子生物学分子生物学
- 免疫学 免疫学 免疫学
- 微生物遗传学 微生物遗传学
背景情况:
- 基于循环寡核酸的抗菌体信号传导系统 (CBASS) 是对菌体感染的关键细菌防御机制.
- 菌体已经进化了像Acb2这样的抗CBASS蛋白,通过隔离循环寡核酸信号来抵消这些免疫系统.
- 了解这些分子相互作用是解读宿主-病原体动态的关键.
研究的目的:
- 研究Acb2蛋白与CBASS信号分子相互作用的分子机制.
- 确定Acb2对循环二核酸 (CDN) 和循环三核酸 (CTN) 的结合亲和性和特异性.
- 评估Acb2对各种CBASS系统的广泛抑制潜力.
主要方法:
- 生物化学分析以表征Acb2与CDN和CTN的结合.
- 抑制试验测量Acb2对人类细胞STING活性的影响.
- 在多种菌体和菌体基因组中对Acb2同类的基因组学分析.
主要成果:
- Acb2有效地封存由CBASS系统产生的多个CDN,抑制干扰素基因刺激器 (STING) 活动.
- Acb2与CBASS循环三核酸 (CTNs) 在不同于CDN的位置以高亲和力结合,其中一个六合体同时结合两个CTN和三个CDN.
- 遗传学分析表明,大多数Acb2同类物具有对CTN和CDN的双重结合能力.
结论:
- 通过隔离几乎所有已知的CBASS信号分子,Acb2作为基于cGAS的免疫的宽谱抑制剂.
- Acb2的双结合口袋为菌体提供了对细菌CBASS系统的强有力的防御机制.
- 这项研究揭示了菌体用来克服宿主免疫力的复杂分子策略.
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