サイト指向リボースメチル化は,AAUAAA認識とポリ (A) 添加にとって重要なポリアデニレーション基板の2'-OH群を特定します
V J Bardwell1, M Wickens, S Bienroth
1Department of Biochemistry, College of Agriculture and Life Sciences, University of Wisconsin, Madison 53706.
Cell
|April 5, 1991
まとめ
メッセンジャーRNA (mRNA) のポリアデニレーションを調査した結果,AAUAAA配列内の特定の糖接触が,特異性因子による認識に不可欠であることが明らかになりました. 糖と塩基の両方の認識は,このRNA-タンパク質相互作用に不可欠です.
科学分野:
- 分子生物学は分子生物学である.
- RNA 処理 RNA 処理
- バイオケミストリー バイオケミストリー
背景:
- ポリアデニレーションは,真核伝達 RNA (mRNA) の重要な転写後の改変である.
- 3'非翻訳領域のAAUAAAヘクサマー配列は,ポリアデニレーションの重要な認識部位である.
- この認識における特定のRNA-タンパク質相互作用の役割,特に砂糖の部分を含む役割は完全に理解されていません.
研究 の 目的:
- mRNAポリアデニレーション中のシーケンス固有の認識のための砂糖接触の重要性を調査する.
- AAUAAA配列内の特定の位置におけるリボースメチル化がポリアデニル化効率と因子結合に与える貢献を決定する.
主な方法:
- 選択されたリボースの位置で2'-O-メチル (2'-O-CH3) 改変を伴う化学合成RNA基板.
- これらの改変RNA基板を用いたインビトロポリアデニレーション試験.
- 改変RNA配列に結合する特異性因子の評価.
主要な成果:
- 効率的なポリアデニレーションは,AAUAAA配列と3'-末端アデノシンを除くすべての位置で甲基化されたRNA基板で発生しました.
- AAUAAA配列内の単一リボースのメチル化により,ポリ (A) アディションと特異性因子結合の両方が著しく抑制されました.
- 抑制の程度は,リボースメチル化の核酸位によって変化し,糖との接触の異なる重要性を示した.
結論:
- 特殊性因子は,塩基と糖分の両方を含むRNA-タンパク質接触を通じてAAUAAA配列を認識します.
- AAUAAA内の異なるヌクレオチド位置における特定のリボース接触は,効率的なポリアデニレーションに不可欠です.
- 認識メカニズムは,塩基特異と糖特異の相互作用の組み合わせを含み,RNA-タンパク質結合の複雑さを強調しています.
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...
pre-mRNA Processing
In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl guanosine). This 5’ cap helps the...
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl guanosine). This 5’ cap helps the...
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 Editing
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...
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...
Pre-mRNA Processing: Modification of pre-mRNA Ends
In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a cap to the 5' end of the growing transcript. In this process, a 5' phosphate is replaced by modified guanosine that has a methyl group attached (7-methyl guanosine). This 5' cap helps the cell...
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a cap to the 5' end of the growing transcript. In this process, a 5' phosphate is replaced by modified guanosine that has a methyl group attached (7-methyl guanosine). This 5' cap helps the cell...


