相关实验视频
Updated: Jun 5, 2025
11:53
Substrate Generation for Endonucleases of CRISPR/Cas Systems
Published on: September 8, 2012
27.3K
与逆转录酶-Cas1融合蛋白相关的VI型CRISPR-Cas系统的适应性免疫
María Dolores Molina-Sánchez1, Francisco Martínez-Abarca1, Vicenta Millán1
1Department of Soil and Plant Microbiology, Estación Experimental del Zaidín, Consejo Superior de Investigaciones Científicas, Structure, Dynamics and Function of Bacterial Genomes, Grupo de Ecología Genética de la Rizosfera, C/Profesor Albareda 1, 18008 Granada, Spain.
Nucleic acids research
|December 14, 2024
概括
反转录酶-Cas1 (RT-Cas1) 融合蛋白是新型细菌CRISPR-Cas系统中基于RNA的间隔器获取的关键. 这些系统提供了对RNA入侵者的适应性免疫力,独立于其他系统.
科学领域:
- 微生物学 微生物学
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 六型CRISPR-Cas系统准RNA,但间隔器获取机制尚未完全理解.
- 之前的工作在一些VI-A型系统中确定了逆转录酶-Cas1 (RT-Cas1) 融合蛋白.
- 肠道微生物组拥有多样化的细菌系统,具有潜在的新型适应性免疫机制.
研究的目的:
- 研究RT-Cas1融合蛋白在VI-B型CRISPR-Cas系统中的作用.
- 描述一种涉及RNA间隔器获取的新型VI-B1型变异系统.
- 阐明CORA在这些RNA向系统中的功能.
主要方法:
- 从肠道微生物群中分离出细菌菌株.
- 克里斯普尔-卡斯系统表征 (VI-B1变体).
- 用于间隔器获取,阵列处理和干扰的功能测试.
- 对逆转录酶活性和CORA功能 (金属离子运输,RNA干扰调制) 的分析.
主要成果:
- RT-Cas1融合蛋白被VI-B型系统招募,形成一个VI-B1变体.
- 这些系统用于从RNA,CRISPR阵列处理和干扰中获取间隔器.
- 相关的逆转录酶使RNA间隔器获取成为可能.
- 科拉携带双价金属离子,并降低CAS13b介导的RNA干扰.
结论:
- 第六类RT-CRISPR系统独立调解针对RNA入侵者的适应性免疫力.
- 反转录酶对于这些系统中RNA衍生的间隔器获取至关重要.
- 在VI-B1系统内,CORA在Cas13b活动中起着监管作用.
相关概念视频
02:53CRISPR and crRNAs
16.7K
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...
16.7K
01:59CRISPR
49.3K
Genome editing technologies allow scientists to modify an organism’s DNA via the addition, removal, or rearrangement of genetic material at specific genomic locations. These types of techniques could potentially be used to cure genetic disorders such as hemophilia and sickle cell anemia. One popular and widely used DNA-editing research tool that could lead to safe and effective cures for genetic disorders is the CRISPR-Cas9 system. CRISPR-Cas9 stands for Clustered Regularly Interspaced...
49.3K
02:31Homologous Recombination
50.2K
The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
50.2K
01:29Immune Response Against Viral Pathogens
745
The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
745