空間的に相関するダイナミクスを視覚化して,RNAのコンフォメーショントランジションを指示する
Qi Zhang1, Andrew C Stelzer, Charles K Fisher
1Department of Chemistry and Biophysics, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109-1055, USA.
Nature
|December 22, 2007
まとめ
研究者は,NMRを用いてRNAのダイナミクスを視覚化し,リガンド誘発の構成変化を導く構造的動きを明らかにした. この研究は,RNAの柔軟性が特定の経路に沿った移行をどのように導いているかを明らかにします.
科学分野:
- バイオケミストリー バイオケミストリー
- 構造生物学 構造生物学とは
- 分子生物物理学 分子生物物理学
背景:
- RNA分子は,細胞機能に不可欠な複雑な3D構造に折りたたまれます.
- これらの構造は,細胞信号の影響を受けた形状的移行を経験します.
- RNAの原子の動きと動態を視覚化することは,実験的に困難でした.
研究 の 目的:
- RNAのダイナミクスを高解像度で視覚化するための新しいNMR戦略を開発し,適用する.
- RNAの構造,柔軟性,および構成的移行の間の関係を調査する.
- RNAのダイナミクスがリガンド誘発の構成変化をどのように導いているかを理解する.
主な方法:
- 核磁共振 (NMR) スペクトロスコーピーを利用しました.
- NMRの基準枠を個々のRNAヘリクに固定する戦略を開発した.
- 余剰二極結合 (RDC) の"相対的"セットを使用して,ヘリックス間の動態を測定しました.
主要な成果:
- RNAにおける大振幅のヘリックス運動を完全な3D回転感度で視覚化しました.
- 観察された相関的な回転 (110度まで) と曲折 (約. 94度) のリンクされたRNAヘリコプターである.
- 動的軌跡に沿って7つの異なるリガンド結合形状を特定しました.
結論:
- RNAのダイナミクスは驚くほど構造化され,定義された3D軌道をたどることができます.
- この構造化ダイナミクスは,特定の構成経路に沿って,リガンド誘発の移行を導く.
- 部分的に構造化されていないRNAでさえ,機能的構成の変化を直接的に導いたダイナミクスを示します.
関連する概念動画
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 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 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...
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution
At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...


