関連する実験動画
Updated: Jun 22, 2025
11:53
Substrate Generation for Endonucleases of CRISPR/Cas Systems
Published on: September 8, 2012
27.3K
CRISPR-Cas複合体を分解するアンチCRISPR
Chantel N Trost1,2, Jing Yang3,4, Bianca Garcia1
1Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada.
Nature
|July 3, 2024
まとめ
新しい抗CRISPRタンパク質であるAcrIF25は,大きなCRISPR- Casエフェクタ複合体を酵素活動なしに分解します. このタンパク質阻害剤は 亜単位を一つずつ除去し 新しいバイオテクノロジーの応用を可能にします
科学分野:
- 分子生物学
- 生物化学
背景:
- 生物学的システムは,マクロ分子複合体の活動を調節するためにタンパク質阻害剤を使用します.
- アンチCRISPRタンパク質は90種類を超える主要な抑制剤のクラスで,様々な抑制メカニズムを使用しています.
- 既存の阻害剤は,ステリック阻害,酵素改変,または翻訳後の改変の混乱によって機能する.
研究 の 目的:
- 抗CRISPRタンパク質AcrIF25の特徴について
- AcrIF25がタイプI-FのCRISPR-Casシステムを阻害するメカニズムを解明する.
主な方法:
- 構造的および生化学的分析が用いられた.
- CRISPR- Casエフェクタ複合体とのAcrIF25の相互作用を調査した.
主要な成果:
- AcrIF25は,エフェクタ複合体を分解することによって,タイプI-FのCRISPR- Casシステムを阻害します.
- AcrIF25は,酵素活性なしに,CRISPR RNAからCas7サブユニットを配列的に結合して除去する.
- 外部エネルギー源なしで 大規模なマクロ分子複合体を分解する 初めてのタンパク質です
結論:
- AcrIF25は, Cas7サブユニットを連続的に除去することによって,タイプI-FのCRISPR-Casエフェクタ複合体を分解します.
- AcrIF25は酵素活性なしに機能し,マクロ分子複合阻害剤の新しいパラダイムを確立しました.
- このメカニズムは バイオテクノロジーの応用が可能です
さらに関連する動画
関連する概念動画
01:59CRISPR
50.4K
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...
50.4K
02:53CRISPR and crRNAs
16.9K
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...
16.9K
02:31Homologous Recombination
50.4K
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...
50.4K
01:24Caspases
12.4K
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...
12.4K