関連する実験動画
Updated: Aug 19, 2025

11:53
Substrate Generation for Endonucleases of CRISPR/Cas Systems
Published on: September 8, 2012
27.4K
タイプVのCRISPR関連トランポゾン複合体の構成基盤
Michael Schmitz1, Irma Querques1, Seraina Oberli1
1Department of Biochemistry, University of Zurich, Zurich 8057, Switzerland.
Cell
|November 26, 2022
まとめ
この研究は,CRISPR- Casシステムにおけるリボソームタンパク質S15の予期せぬ役割を明らかにし,特にタイプV- K要素によるRNA誘導トランスポーゼーションを明らかにした. この発見はCRISPRに関連したトランスポゾンアセンブリの重要なメカニズムを明らかにし,プログラム可能なDNA挿入ツールの開発を支援しています.
科学分野:
- 分子生物学
- 遺伝学
- 構造生物学
背景:
- CRISPR-Casシステムは,RNA誘導トランスポーゼーションのためにTn7のような要素によって適応されています.
- タイプV-KのCRISPR関連トランポゾンは,トランポゼーションのためにCas12k,TnsC,TniQ,およびTnsBを使用する.
研究 の 目的:
- タイプV-KのCRISPR関連トランポゾンアセンブリの構造とメカニズムを明らかにする.
- RNA 誘導トランスポーゼーションに関与する成分と相互作用を特定する.
主な方法:
- Cas12k-トランポゾン複合体の構造を決定するために,冷凍電子顕微鏡を用いる.
- 構造的発見と機能的役割を検証するトランスポーゼーション活動アッセイ
主要な成果:
- 標的DNA結合複合体の冷凍電子顕微鏡構造は,リボソームタンパク質S15の予期せぬ存在を明らかにした.
- 複雑な組み立てには,ガイドRNA,TniQ,S15,Cas12k,TnsCの相互作用が含まれ,Rループの完成につながります.
- TniQは,Cas12k近接フィラメントの端でTnsCポリメリゼーションを核化する.
- リボソームタンパク質S15は,タイプVのCRISPR関連トランポゾン機構の機能的成分として特定されています.
結論:
- この研究は,CRISPR関連トランポゾンにおけるRNA媒介組成の重要なメカニズムを明らかにした.
- この発見は,S15がトランスポーゼーションを誘導する役割を強調し,プログラム可能なDNA挿入ツールの開発の可能性を示唆しています.
関連する概念動画
DNA-only Transposons
14.6K
DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. Insertion of transposons can alter gene functions in multiple ways. They can mutate the gene, alter gene expression by introducing a novel promoter or insulator sequence, introduce new splice sites, and change the mRNA transcripts produced, or remodel chromatin structure.
The donor site from where the transposon is excised is either degraded or...
The donor site from where the transposon is excised is either degraded or...
14.6K
CRISPR and crRNAs
17.3K
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...
17.3K
Overview of Transposition and Recombination
16.0K
Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...
16.0K
CRISPR
52.7K
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...
52.7K
LTR Retrotransposons
17.7K
LTR retrotransposons are class I transposable elements with long terminal repeats flanking an internal coding region. These elements are less abundant in mammals compared to other class I transposable elements. About 8 percent of human genomic DNA comprises LTR retrotransposons. Some of the common examples of LTR retrotransposons are Ty elements in yeast and Copia elements in Drosophila.
The internal coding region of LTR retrotransposons and their mechanism of transposition closely resembles a...
The internal coding region of LTR retrotransposons and their mechanism of transposition closely resembles a...
17.7K
Mechanism of Conjugation
90
Bacterial conjugation is a mechanism of horizontal gene transfer that enables the exchange of genetic material between bacterial cells through direct contact. This process is facilitated by a donor cell carrying a conjugative plasmid, which encodes genes necessary for pilus formation, DNA replication, and transfer. The conjugative plasmid plays a central role in initiating and executing the transfer of genetic material.The tra region of the conjugative plasmid encodes proteins responsible for...
90

