アルギニン媒介RNA認識: アルギニンフォーク
B J Calnan1, B Tidor, S Biancalana
1Whitehead Institute for Biomedical Research, Nine Cambridge Center, MA 02142.
Science (New York, N.Y.)
|May 24, 1991
まとめ
HIV-1 Tatタンパク質ペプチドのアルギニン残基は,特異的にTAR RNAの膨らみと結合し,トランザクティベーションに不可欠です. このアルギニン-RNAの相互作用は,アルギニンを強調しています.
科学分野:
- 分子生物学は分子生物学である.
- ウイルス学 ウイルス学 ウイルス学
- バイオケミストリー バイオケミストリー
背景:
- ヒト免疫不全ウイルス1型 (HIV-1) のタットタンパク質は,ウイルスの遺伝子発現に不可欠です.
- タットタンパク質は,ウイルスRNAのトランザクティベーション応答 (TAR) 要素と相互作用する.
- Tatの基本領域は,TAR RNAを結合することが知られているが,正確な分子相互作用は完全に解明されていない.
研究 の 目的:
- 特定のアミノ酸残基,特にアルギニンの役割が,TAT由来ペプチドがTARRNAに結合する過程を調査する.
- これらの相互作用が,タットタンパク質のトランザクティベーション活動に与える貢献度を決定する.
- アルギニン媒介によるRNA膨張の認識の構造的基礎を解明する.
主な方法:
- TARRNAを用いたペプチド合成と結合分析.
- タットタンパク質のサイト指向型変異.
- インビトロトランザクティベーションアッセイ.
- エチル化の干渉実験.
- 分子モデリングと構造分析.
主要な成果:
- 9つのアルギニン (R9) を含んだペプチドは,TAR RNAに特定の結合を示した.
- R9を持つ変異したTatタンパク質は,完全なトランザクティベーション活性を示した.
- 9つのライシン (K9) を含むペプチドは,TARに結合が薄く,対応するタンパク質は限界的活性を示している.
- 特定の結合とトランザクティベーションに不可欠な単一のアルギニン残基の特定.
- エチル化の干渉とモデリングは,RNAの膨らみにおけるアルギニンが隣接するリン酸と接触することを示唆しています.
結論:
- アルギニンのサイドチェーンは,TATペプチドがTARRNAの膨らみに特異的に結合する上で重要な役割を果たします.
- RNAのリン酸とアルギニン媒介の水素結合ネットワークは,RNAの構造的モチーフの認識を容易にする可能性がある.
- アルギニンは,タンパク質が特定のRNA構造,特にループと膨張を認識するために利用する一般的な残留物である可能性があります.
関連する概念動画
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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...
01:23RNA Interference
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...
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Different Types of RNA Have the Same Basic Structure
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