関連する実験動画
Updated: Sep 21, 2025

10:46
Gene Digital Circuits Based on CRISPR-Cas Systems and Anti-CRISPR Proteins
Published on: October 18, 2022
1.9K
タイプIII-EのCRISPR-Cas7-11エフェクター複合体の構造と工学
Kazuki Kato1, Wenyuan Zhou2, Sae Okazaki1
1Structural Biology Division, Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, Japan.
Cell
|June 1, 2022
まとめ
Cas7-11 CRISPR-Casシステムは,バクテリアと哺乳類の細胞にダブルRNAターゲティング能力を提供しています. 構造的な洞察により,AAVベクトルを用いてin vivo RNAノックダウンアプリケーションのためのコンパクトなCas7-11の設計が可能になりました.
科学分野:
- 分子生物学
- 構造生物学
- 遺伝子編集技術
背景:
- タイプIII-EのCRISPR-Casエフェクタ,Cas7-11は,ユニークな二重RNase活動を持っています.
- これらの活動には,前駆体CRISPRRNA (pre- crRNA) 処理とCRISPRRNA (crRNA) 誘導の標的RNA分裂が含まれています.
- Cas7-11は,バクテリアと哺乳類の両方のシステムにおけるRNAターゲティングのための新しいプラットフォームを表しています.
研究 の 目的:
- crRNAと標的RNAに結合するCas7-11複合体の高解像度構造を決定する.
- Cas7-11の二重RNase活動に伴う分子メカニズムを解明する.
- 微小型のCas7-11を in vivoで開発する
主な方法:
- クリオ電子顕微鏡 (cryo-EM) で 2.5 Å の解像度.
- 触媒活性を確認するために生化学分析.
- Cas7-11の合理的なタンパク質工学
主要な成果:
- この研究では,Cas7-11の7つのドメインと4つのリンクアーキテクチャが明らかになりました.
- 構造分析により,crRNA処理および標的RNA認識における特定のドメインの役割が特定されました.
- RNA分裂のための触媒残留物の位置づけに関する構造的発見と相関する生化学データ.
- コンパクトなCas7-11変種 (Cas7-11S) が成功した.
結論:
- 決定された構造は,RNAターゲティングのためのCas7-11の作用機構に関する重要な洞察を提供します.
- 設計されたCas7-11Sは,ヒト細胞のトランスクリプトを効率的に破壊するために,単一ベクトルのAAV包装を容易にする.
- この研究は,RNA調節のためのCas7-11システムの将来的なin vivoアプリケーションを可能にします.
関連する概念動画
CRISPR and crRNAs
17.5K
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...
17.5K
CRISPR
53.1K
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...
53.1K
CRISPR/Cas9 Genome Editing
443
The CRISPR-Cas system serves as a bacterial defense mechanism against invading genetic elements such as viruses and plasmids, forming the foundation for its adaptation as a powerful genome-editing tool. Originally discovered in prokaryotes, this system has been repurposed to revolutionize genetic engineering across a wide range of organisms, including plants, animals, and humans. The core component, Cas9, is an endonuclease derived from Streptococcus pyogenes, capable of introducing...
443
The Antiviral System of Bacteria and Archaea: CRISPR
152
CRISPR stands for Clustered Regularly Interspaced Short Palindromic Repeats is a adaptive immune system found in bacteria and archaea that protects against viral infections. This system enables prokaryotic cells to identify, remember, and neutralize foreign genetic elements, primarily bacteriophages, by storing fragments of the invader’s DNA as a genetic memory.The CRISPR immune response begins during an initial infection. Cas (CRISPR-associated) proteins play a central role in this...
152
Protein Complexes with Interchangeable Parts
2.6K
Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order...
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order...
2.6K
Conservative Site-specific Recombination and Phase Variation
6.2K
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...
6.2K

