関連する実験動画
Updated: Jul 4, 2026

12:26
Optical Tweezers to Study RNA-Protein Interactions in Translation Regulation
Published on: February 12, 2022
RNAのC2'-エンドヌクレオチドにおけるゆっくりとした構成動態
Costin M Gherghe1, Stefanie A Mortimer, Joseph M Krahn
1Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, USA.
Journal of the American Chemical Society
|June 19, 2008
まとめ
PRIMER EXTENSION (SHAPE) 化学で分析されたRNAセレクティブ2′-ヒドロキシルアサイレーションを使用して検出されたRNAのゆっくりとした構成の変化は,分子スイッチとして作用する特定のC2′-エンド核酸体を明らかにします. これらのダイナミクスは,RNAの折りたたみと機能に不可欠です.
科学分野:
- バイオケミストリー バイオケミストリー
- 分子生物学は分子生物学である.
- 構造生物学 構造生物学とは
背景:
- RNA分子は,ピコ秒から数分まで,幅広い時間スケールで局所構成のダイナミクスを示します.
- 遅い動きは,RNAの折りたたみ,リガンド結合,リボヌクレオプロテイン組立に不可欠ですが,大規模で複雑なRNAで研究することは困難です.
- PRIMER EXTENSION (SHAPE) によるRNAセレクティブ2'-ヒドロキシルアキレーション分析化学は,リボース2'-ヒドロキシル位置でのアキレーションをモニタリングすることによって,ニュクレオチドの柔軟性を探知する.
研究 の 目的:
- 局所RNAの構成動態,特にC2'-endo構成が,RNAの反応性と機能を支配する役割を調査する.
- 改変したSHAPE化学を用いてRNAの構成変化の時間スケールを特徴付ける.
- 生物学的プロセスに影響を与えるRNA構造内の潜在的な分子スイッチを特定する.
主な方法:
- RNAのコンフォーマーションダイナミクスを探査するために,アシライティング反応剤の異なる電友性を持つRNA SHAPE化学を使用しました.
- 異なる時間領域におけるニュクレオチドの柔軟性と反応性を監視する.
- モデルRNAシステムと,定義された三次構造を持つ大きなRNAの両方に適用された方法.
主要な成果:
- C2'-endo核酸がSHAPE反応剤に対して均一に反応しないことが実証された.反応性は,反応剤の電友性と核酸の構成状態に依存する.
- 特定された特定のC2'-endoヌクレオチドは,非常に遅い形状変化 (10^-4 s^-1の順序) を表しています.
- これらの遅いダイナミクスは,モデルと複雑な生物学的RNA構造の両方で観察可能であることを示した.
結論:
- C2'-endoコンフォーメーションだけでは,SHAPEの反応性を決定するものではなく,コンフォーメーションの相互変換のダイナミクスが鍵となる.
- 特定のC2'-endo核酸は,独自の局所動力学により,ゆっくりとした分子スイッチとして機能します.
- これらの遅いダイナミクスは,RNAの折り畳み経路と機能的メカニズムにおける重要な,しかしながら過小評価されている役割を果たしている可能性があります.
関連する概念動画
RNA Structure
The basic structure of RNA consists of a string of ribonucleotides attached by phosphodiester bonds. 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) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...
RNA Structure
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...
RNA Structure
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...
RNA Stability
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...
RNA Stability
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...
Ribosomal RNA Synthesis
Ribosome synthesis is a highly complex and coordinated process involving more than 200 assembly factors. The synthesis and processing of ribosomal components occurs not only in the nucleolus but also in the nucleoplasm and the cytoplasm of eukaryotic cells.
Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...
Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...

