プレリボソームRNAのサイト固有のリボースメチル化:小核核RNAの新たな機能
Z Kiss-László1, Y Henry, J P Bachellerie
1Laboratorie de Biologie Moléculaire Eucaryote du CNRS, Toulouse, France.
Cell
|June 28, 1996
まとめ
小核RNAs (snoRNAs) は,リボソームRNAを改変するために不可欠です. これらの反感覚スノRNAは,前駆体リボソームRNAの特定の部位にメチル化を誘導し,真核細胞における小さなRNAのより広範な役割を明らかにします.
科学分野:
- 分子生物学は分子生物学である.
- RNA 生物学 RNA 生物学
- 細胞生物学 細胞生物学
背景:
- ユカリオット細胞は,成熟したリボソームRNA (rRNA) との互補性を持つフィブリラリナー関連小核核RNA (snoRNA) を利用する.
- 多くのスノRNAの正確な機能,特にアンチセンセスの変種は,まだ完全に理解されていません.
研究 の 目的:
- 新種のアンチセンセススノRNAを特徴づけ,リボソームのRNA処理におけるその役割を明らかにする.
- スノRNAが前駆体rRNAの局所特有の改変を媒介するメカニズムを調査する.
主な方法:
- 21種類の新しいヒトアンチセンセススノRNAsの特徴化.
- 酵母U24snoRNAを用いた遺伝的枯渇と再構成の研究.
- スノRNAと前駆体rRNAの塩基配列相互作用の分析.
主要な成果:
- 先駆体rRNAの改変に関与する新しいアンチセンセススノRNAを特定しました.
- プレ-rRNAのサイト固有の2'-O-メチル化にアンチセンセスのsnoRNAが必要であることを実証した.
- アンチセンセススノRNAは,アンチセンセス要素とD/D'ボックスの導きによる,プレ-rRNAとの直接の塩基配列によって機能することを示した.
結論:
- アンチセンセススノRNAは,プリ-rRNAの2'-O-メチル化に不可欠である.
- このメカニズムは,直接ベースペアリングと特定のシーケンス認識を伴う.
- ユーカリオット小RNAは,リボヌクレオチドの共振的改変を含む,これまで認識されていたよりも多様な機能を発揮します.
関連する概念動画
01:27Ribosomes
Ribosomes translate genetic information encoded by messenger RNA (mRNA) into proteins. Both prokaryotic and eukaryotic cells have ribosomes. Cells that synthesize large quantities of protein—such as secretory cells in the human pancreas—can contain millions of ribosomes.Ribosome Structure and AssemblyRibosomes are composed of ribosomal RNA (rRNA) and proteins. In eukaryotes, rRNA is transcribed from genes in the nucleolus—a part of the nucleus that specializes in ribosome production. Within the...
02:53Ribosomal 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,...
01:27Ribosomes
Ribosomes translate genetic information encoded by messenger RNA (mRNA) into proteins. Both prokaryotic and eukaryotic cells have ribosomes. Cells that synthesize large quantities of protein—such as secretory cells in the human pancreas—can contain millions of ribosomes.Ribosome Structure and AssemblyRibosomes are composed of ribosomal RNA (rRNA) and proteins. In eukaryotes, rRNA is transcribed from genes in the nucleolus—a part of the nucleus that specializes in ribosome production. Within the...
02:53Ribosomal 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,...
01:27Ribosomes
Ribosomes translate genetic information encoded by messenger RNA (mRNA) into proteins. Both prokaryotic and eukaryotic cells have ribosomes. Cells that synthesize large quantities of protein—such as secretory cells in the human pancreas—can contain millions of ribosomes.
Ribosome Structure and Assembly
Ribosomes are composed of ribosomal RNA (rRNA) and proteins. In eukaryotes, rRNA is transcribed from genes in the nucleolus—a part of the nucleus that specializes in ribosome production. Within...
Ribosome Structure and Assembly
Ribosomes are composed of ribosomal RNA (rRNA) and proteins. In eukaryotes, rRNA is transcribed from genes in the nucleolus—a part of the nucleus that specializes in ribosome production. Within...
01:27Ribosomes
Ribosomes translate genetic information encoded by messenger RNA (mRNA) into proteins. Both prokaryotic and eukaryotic cells have ribosomes. Cells that synthesize large quantities of protein—such as secretory cells in the human pancreas—can contain millions of ribosomes.
Ribosome Structure and Assembly
Ribosomes are composed of ribosomal RNA (rRNA) and proteins. In eukaryotes, rRNA is transcribed from genes in the nucleolus—a part of the nucleus that specializes in ribosome production. Within...
Ribosome Structure and Assembly
Ribosomes are composed of ribosomal RNA (rRNA) and proteins. In eukaryotes, rRNA is transcribed from genes in the nucleolus—a part of the nucleus that specializes in ribosome production. Within...