カス9 の 金属依存 活動 を 制御 する 謎めいた 結合 ポケット
bioRxiv : the preprint server for biology
|September 5, 2025
まとめ
マグネシウムのような二重金属は 隠されたポケットに結合して Cas9遺伝子編集酵素を活性化させ その機能を強化します この発見は 遺伝子編集の効率を 改善する鍵となるものです
科学分野:
- 生物化学
- 分子生物学
- 構造生物学
背景:
- Cas9核酵素は 革命的な遺伝子編集ツールです
- 金属に依存する活動と効率は,細胞の種類によって異なります.
- Cas9機能における二価金属の正確な役割は完全に理解されていません.
研究 の 目的:
- Cas9の触媒機能に対する二価金属の影響を明らかにする.
- 異なる細胞環境におけるCas9活性を調節する分子機構を特定する.
- 金属イオンの濃度が 遺伝子編集の効率に どう影響するか
主な方法:
- 広範な分子シミュレーション
- マルコフ状態モデル
- 生化学的測定法
- 核磁共振 (NMR) スペクトロスコーピー
主要な成果:
- 二重金属 (Mg2+,Ca2+,Co2+) は,Cas9 HNH核酸ドメインを活性化する.
- HNH-RuvCインターフェイスで動的に形成された二価金属結合ポケット (DBP) が確認されています.
- DBP残留物の変異は,Cas9の触媒的活性を低下させ,その調節作用を強調する.
- イオン強さはCas9の構成活性に影響し,触媒活動は金属特有である.
結論:
- 暗号化されたDBPはCas9の金属依存性の 重要なレギュラーです
- 金属イオンの相互作用を理解することは,Cas9を様々な遺伝子編集アプリケーションに最適化するために不可欠です.
- 発見は,様々な生物学的システムにおけるCas9の性能を向上させるための基礎を提供する.
さらに関連する動画
関連する概念動画
CRISPR/Cas9 Genome Editing
208
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...
208
CRISPR
52.8K
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...
52.8K
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
Cooperative Binding of Transcription Regulators
6.5K
Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome. Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form...
6.5K
Cis-regulatory Sequences
10.1K
Cis-regulatory sequences are short fragments of non-coding DNA that are present on the same chromosomes as the genes that they regulate. These fragments serve as binding sites for transcriptional regulators, proteins that are responsible for controlling gene transcription and differential gene expression across cell types in eukaryotes. Cis-regulatory sequences can be close to the gene of interest or thousands of bases away in the DNA sequence; however, those sequences that are further away are...
10.1K
Allosteric Proteins-ATCase
5.9K
Binding sites linkages can regulate a protein's function. For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
5.9K


