菌体抗CBASS和抗Pycsar核酶破坏了细菌的免疫力
Samuel J Hobbs1,2, Tanita Wein3, Allen Lu1,2
1Department of Microbiology, Harvard Medical School, Boston, MA, USA.
Nature
|April 8, 2022
概括
细菌抗菌体防御系统,循环寡核酸基抗菌体信号传递 (CBASS) 和抗菌体耐药性皮里米丁环酶系统 (Pycsar) 被新型菌体蛋白质抵制. 这些抗CBASS (Acb) 和抗Pycsar (Apyc) 蛋白质降解循环核酸信号,阻断细菌免疫力.
科学领域:
- 微生物学
- 分子生物学
- 病毒学
背景情况:
- 细菌利用循环寡核酸基抗菌体信号传递 (CBASS) 和胺环酶系统进行抗菌体抵抗 (Pycsar) 作为抗菌体的防御机制.
- 这些系统依赖循环核酸信号来触发细胞死亡并阻止病毒复制.
- 现有的菌体逃避策略针对CRISPR和限制修饰系统,但不针对CBASS或Pycsar.
研究的目的:
- 研究菌体机制以逃避CBASS和Pycsar菌体免疫力.
- 识别和表征抗菌体防御系统的新型菌体蛋白.
主要方法:
- 在大肠杆菌和细菌中对57个菌体进行了生物化学查.
- 确定了抗CBASS (Acb1) 和抗Pycsar (Apyc1) 蛋白质的晶体结构.
- 进行了体内实验,以评估Acb1和Apyc1在阻断防御中的有效性.
主要成果:
- 菌体编码抗CBASS (Acb) 和抗Pycsar (Apyc) 蛋白质,这些蛋白质会降解循环核酸信号.
- Acb1和Apyc1被确定为不同的蛋白质家族的创始成员.
- 结构和生化分析显示了Acb1和Apyc1对信号降解的不同机制.
- 显示Acb1和Apyc1阻断了下游效应器,并在体内产生了耐药性.
结论:
- 主体循环核酸信号的分裂是一种关键的菌体免疫逃避策略.
- Acb 和 Apyc 蛋白质代表了跨多种菌体克服细菌防御的保存机制.
- 发现Acb和Apyc扩大了我们对菌体与宿主相互作用和细菌免疫力的理解.
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