细菌CBASS和细菌菌之间的军备竞赛
Lan Wang1,2,3, Leiliang Zhang1,2,3
1Department of Clinical Laboratory Medicine, The First Affiliated Hospital of Shandong First Medical University and Shandong Provincial Qianfoshan Hospital, Jinan, Shandong, China.
Frontiers in immunology
|August 14, 2023
概括
细菌循环寡核酸基抗菌体信号系统 (CBASS) 使用细胞自杀来对抗菌体. 菌体进化了逃避蛋白来克服这种细菌防御,创造了一个正在进行的进化军备竞赛.
科学领域:
- 微生物学 微生物学
- 免疫学 免疫学 免疫学
- 病毒学 病毒学
背景情况:
- 细菌循环寡核酸基抗菌体信号系统 (CBASS) 是一种关键的细菌天生的免疫系统.
- CBASS利用由CD-NTase酶合成的循环寡核酸 (cOs) 触发细胞死亡,抑制菌体复制.
- 菌体已经发展出复杂的机制来逃避CBASS介导的免疫力.
研究的目的:
- 为CBASS天生的免疫系统提供全面的审查.
- 阐明CBASS和菌体抗免疫策略之间的复杂相互作用.
- 探索在原生生物和真核生物系统中保存的病毒免疫逃避机制.
主要方法:
- 文献综述和对CBASS和菌体-细菌相互作用现有研究的综合.
- 对细菌免疫系统和病毒逃避策略的比较分析.
- 探索CBASS激活和菌体反防御的基础分子机制.
主要成果:
- CBASS通过合成CO和激活效应蛋白 (Caps) 来起作用,这些蛋白质会诱导DNA裂变,膜损伤和NAD枯竭.
- 辅助蛋白对于cO合成和CD-NTase激活的初始化至关重要.
- 菌体使用免疫逃避蛋白来破坏Cap对cos的识别,确保它们自己的传播.
结论:
- CBASS代表了强大的细菌防御对菌体感染,其特点是编程细胞死亡.
- 在CBASS和菌体之间的共同进化战斗推动了各种免疫逃避策略的发展.
- 了解这些相互作用为更广泛的病毒宿主动态和潜在的治疗点提供了见解.
相关概念视频
01:26DNA Bacteriophages
52
Bacteriophages, or phages, are viruses that specifically infect bacteria, utilizing their genetic material to hijack host cellular machinery for replication. DNA bacteriophages employ single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA) genomes. These phages exhibit diverse replication strategies and host interactions, influencing their ecological roles and applications in biotechnology and medicine.ssDNA BacteriophagesssDNA phages, with their small genomes, utilize unique strategies to...
52
01:30Lytic Cycle of Bacteriophages
70.9K
Bacteriophages, also known as phages, are specialized viruses that infect bacteria. A key characteristic of phages is their distinctive “head-tail” morphology. A phage begins the infection process (i.e., lytic cycle) by attaching to the outside of a bacterial cell. Attachment is accomplished via proteins in the phage tail that bind to specific receptor proteins on the outer surface of the bacterium. The tail injects the phage’s DNA genome into the bacterial cytoplasm. In the...
70.9K
02:53CRISPR and crRNAs
17.1K
Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
17.1K
00:43Lysogenic Cycle of Bacteriophages
62.3K
In contrast to the lytic cycle, phages infecting bacteria via the lysogenic cycle do not immediately kill their host cell. Instead, they combine their genome with the host genome, allowing the bacteria to replicate the phage DNA along with the bacterial genome. The incorporated copy of the phage genome is called the prophage. Some prophages can re-activate and enter the lytic cycle. This often occurs in response to a perturbation, such as DNA damage, but can also transpire in the absence of...
62.3K
01:20Viral Replication: Lytic Cycle
56
Bacteriophages, or phages, are viruses that specifically infect bacteria. Among them, T-even bacteriophages, such as T4, exhibit a well-characterized lytic replication cycle in Escherichia coli (E. coli). This process ensures the rapid proliferation of the virus while ultimately leading to the destruction of the bacterial host.Attachment and DNA InjectionThe infection process begins with the recognition and binding of the T4 phage to the E. coli cell surface. Tail fibers of the phage...
56
01:16Viral Replication: Lysogenic Cycle
54
The lysogenic cycle is a crucial viral replication strategy that allows bacteriophages to persist within host cells without immediately destroying them. This process is primarily observed in temperate phages, such as bacteriophage lambda (λ), which infects Escherichia coli. The cycle allows the viral genome to persist across bacterial generations while keeping host cells viable.Integration of the Viral GenomeUpon infection, bacteriophage lambda attaches to the bacterial surface and injects...
54