RNA編集ガイドストランドの合理的な設計: シチジンアナログの孤児位置
Erin E Doherty1, Xander E Wilcox1, Lenka van Sint Fiet2
1Department of Chemistry, University of California, Davis, California 95616, United States.
Journal of the American Chemical Society
|May 3, 2021
まとめ
ガイドストランドの改変は,精密なRNA編集のために,RNAに作用するアデノシンデミナーゼ (ADARs) の活性を増強する. 核酸類は酵素-RNA複合体を安定させ,誘導率を高め,誘導RNA編集による疾患変異修正を改善する.
科学分野:
- 分子生物学
- 生物化学
- RNAセラピー
背景:
- RNAに作用するアデノシンデミナーゼ (ADARs) は,二重鎖RNAでアデノシンをイノシンに変換することを触媒とする.
- ヒトのADARは,治療的な変異修正のために特定のRNA部位に誘導することができます.
- ADAR2 - RNAの相互作用に関する構造的な洞察は,修正されたガイドストランドの設計にインパクトを与える.
研究 の 目的:
- ADAR2媒介のRNA編集を強化するためのガイドストランドの核酸類似体を設計し評価する.
- 誘導鎖の改変がADAR2活性と酵素-RNA複合体の構成にどのように影響するかを調査する.
- 潜在的な治療用途のためのサイト指向RNA編集の効率を向上させる.
主な方法:
- ADAR2をターゲットとするガイドストランドのための核酸類の構造誘導設計.
- 修正されたガイドストランドでADAR2の触媒速度を測定する生化学的測定法.
- 改変RNAに結合するADAR2の構造を決定するX線結晶学.
- 人間の細胞とマウスの線維芽細胞での in vitro および in vivo 実験で,編集の成果を評価する.
主要な成果:
- 核酸類は,キーガイドストンドの位置で活性化されたADAR2酵素複合体を安定させました.
- 修正されたガイドストランドは,野生型ADAR2によるアデノシン脱アミネーションの触媒速度を増加させた.
- 結晶構造は,E488とシチジンアナログの間の強化された相互作用を明らかにした.
- ガイドRNAにおける単一の核酸変異は,細胞モデルにおける誘導RNA編集の成果を著しく増加させた.
結論:
- ガイドRNAの改変は,過剰活性ADAR変異体を模倣し,編集効率を高めることができます.
- この戦略は,精密でサイト指向のRNA編集のための内生ADARの採用を進めている.
- 核酸アナログの組み込みは,RNA編集の治療法を最適化するための有望なアプローチを提供します.
関連する概念動画
RNA Editing
9.4K
RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
9.4K
Proofreading
57.8K
Overview
57.8K
Proofreading
7.4K
Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template DNA strand. DNA polymerase has a higher affinity to add the correct base and ensures fidelity during DNA replication. Furthermore, it exhibits proofreading activity during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.
Errors During Replication are Corrected by the DNA Polymerase...
Errors During Replication are Corrected by the DNA Polymerase...
7.4K
RNA Interference
26.9K
RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
26.9K
Transfer RNA Synthesis
12.5K
One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases.
Each of these chemical modifications is carried by a specific enzyme, post-transcription. All of these enzymes have unique base and site-specificity. Methylation, the most common chemical modification, is carried by at least nine different enzymes, with...
Each of these chemical modifications is carried by a specific enzyme, post-transcription. All of these enzymes have unique base and site-specificity. Methylation, the most common chemical modification, is carried by at least nine different enzymes, with...
12.5K
Experimental RNAi
6.7K
RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
6.7K


