相关实验视频
Updated: Jul 4, 2025

11:53
Substrate Generation for Endonucleases of CRISPR/Cas Systems
Published on: September 8, 2012
27.4K
蛋白质分解裂变的CRISPR-Cas级联
Jurre A Steens1,2, Jack P K Bravo3, Carl Raymund P Salazar1
1Laboratory of Microbiology, Wageningen University and Research, Wageningen, Netherlands.
概括
第三种CRISPR-Cas系统产生循环基酸盐来激活蛋白质. 这项研究表明RNA检测如何触发类似酶的蛋白酶级联,从而导致Haliangium ochraceum中的细菌防御.
科学领域:
- 微生物学
- 分子生物学
- 生物化学
背景情况:
- 已知CRISPR-Cas系统可以产生循环基酸盐.
- 这些循环分子以共方式激活具有感觉域的蛋白质.
- 基于循环寡核酸的抗菌体信号系统 (CBASS) 与CRISPR-Cas之间的相互作用是一个新兴的研究领域.
研究的目的:
- 来自Haliangium ochraceum的与III-BCRISPR-Cas系统相关的基因的特征.
- 阐明该系统中涉及酶类蛋白酶的作用机制.
- 了解CRISPR-Cas激活对细胞过程的下游影响.
主要方法:
- 相关基因的遗传特征.
- 用于研究蛋白质激活和裂变的生物化学测试.
- 对大肠杆菌进行体内实验以观察干扰表型.
主要成果:
- 鉴定出两种类似卡斯巴酶的合作酶,即SAVED-CHAT和PCaspase,它们与*Haliangium ochraceum*型III-B系统相关.
- 证明循环三氨酸单酸 (AMP) 诱导了SAVED-CHAT的寡合化和激活.
- 显示激活的SAVED-CHAT分裂并激活PCaspase,导致大肠杆菌的广泛蛋白质分裂和强烈干扰表型.
结论:
- 基于CRISPR-Cas的RNA检测启动了涉及酶类酶的蛋白质溶解级联.
- 这一连串,包括SAVED-CHAT和PCaspase,提供了一个强大的防御机制.
- 这些发现揭示了RNA导向免疫和细胞死亡途径之间的复杂相互作用.
相关概念视频
CRISPR and crRNAs
17.0K
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...
17.0K
CRISPR
51.0K
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...
51.0K
Caspases
12.5K
Caspase, a family of cysteine proteases, serve as effectors in apoptosis. The ced3 gene in C.elegans was first identified to be involved in apoptosis. This gene encodes the ced-3 caspase that is similar to the interleukin-1-beta converting enzyme or ICE in mammals. In addition to apoptosis, caspases also function in the inflammatory response. Inflammatory caspases are essential in activating pro-inflammatory cytokines that recruit immune cells and block the replication of pathogens inside...
12.5K
Homologous Recombination
50.5K
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...
50.5K
Conservative Site-specific Recombination and Phase Variation
6.0K
Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
The recognition sites for Cre recombinase called LoxP...
6.0K

