小さな CAG リピートRNAは,RNAの凝縮を促進する粘着性のある末端を持つ二重構造を形成する
Liqi Wan1,2, Chengwei Zhang3, Yu Liu1
1Hangzhou Institute of Medicine, Chinese Academy of Sciences, Hangzhou, Zhejiang 310022, China.
Journal of the American Chemical Society
|January 14, 2025
まとめ
短いCAGのリピートRNAは生物分子の凝縮を促し,病気に関連した凝縮物を形成します. 特定のRNAの構造は 長さだけでなく この段階の移行を促進し 病気のメカニズムや バイオマテリアルデザインの洞察を提供します
科学分野:
- 生物化学
- 分子生物学
- バイオ物理学
背景:
- 生物分子の凝縮は 重要な膜のない臓器を形成しますが 異常な凝縮は 人間の病気と関連しています
- リボ核酸 (RNA) は,タンパク質および他のRNAを含む相変異を経由して凝縮物形成に不可欠である.
- 特に短いRNAの場合,RNA相移行の物理化学的原理は完全に理解されていません.
研究 の 目的:
- ハンチントン病の病原性因子である小さなCAG繰り返す (sCAG) RNAの相移行行動を調査する.
- sCAG RNA駆動生物分子凝縮の構造とメカニズムを明らかにする.
- sCAG RNAコンデンサートの細胞の局所化と影響を調査する.
主な方法:
- 溶液核磁気共鳴 (NMR) スペクトロスコーピー
- 粗粒子の分子動力学 (MD) シミュレーション
- RNA凝縮のインビトロおよび細胞内研究.
主要な成果:
- sCAG RNA (6〜7回) は,インビトロと細胞内の両方で相転換を経験する.
- sCAG RNAは,分子間クロスリンクを媒介するGC豊富な3'-粘着性末端を持つ二重構造を形成する.
- これらの構造的特徴は RNA コンデンサートの形成を促進し,細胞内の核の斑点に定着します.
結論:
- GCが豊富な粘着性末端のような特定のRNA構造モチーフは,シーケンス長さに関係なく,相移行と凝縮物形成を駆動することができます.
- この発見は,生物分子凝縮と疾患の病原性におけるRNAの役割の理解を進める.
- 異常なRNA凝縮を標的とした新しいRNAベースのバイオマテリアルと治療戦略の設計の可能性を開きます.
関連する概念動画
RNA Structure
70.9K
Overview
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
70.9K
Nucleic Acid Structure
5.9K
The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms a 5′ to 3′ phosphodiester linkage.
DNA Structure
DNA...
DNA Structure
DNA...
5.9K
RNA Stability
33.2K
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
33.2K
Single-Strand DNA Binding Proteins
13.9K
For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
13.9K
RNA Splicing
56.0K
Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
56.0K
siRNA - Small Interfering RNAs
16.5K
Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the...
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the...
16.5K


