関連する実験動画
Updated: May 27, 2026

08:49
Peering at Brain Polysomes with Atomic Force Microscopy
Published on: March 16, 2016
ユカリオットのリボソームの構造は3.0 Åの解像度で描かれています
Adam Ben-Shem1, Nicolas Garreau de Loubresse, Sergey Melnikov
1Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch F-67400, France. adam@igbmc.fr
まとめ
研究者らは,酵母菌からの真核80Sリボソームの詳細な原子構造を明らかにした. この画期的な発見は,真核細胞の翻訳とその進化を理解するための枠組みを提供します.
科学分野:
- 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
- 遺伝学 遺伝学とは
背景:
- リボソームは,タンパク質合成を担う重要な分子機械であり,メッセンジャーRNA (mRNA) をポリペプチド鎖に変換する.
- ユカリオットのリボソーム (80S) は,細菌のリボソーム (70S) よりも大きく,複雑で,独自の構造的特徴と規制メカニズムを持っています.
- ユカリオットのリボソームの複雑な構造を理解することは,遺伝子発現とその調節の複雑さを解読する上で極めて重要です.
研究 の 目的:
- Saccharomyces cerevisiaeからの80Sリボソームの高解像度の結晶構造を決定する.
- ユカリオット特有のリボソーム成分と,保存された核との相互作用の建築的詳細を解明する.
- ユカリオットトランスレーションとその進化史を研究するための構造的基礎を提供すること.
主な方法:
- 酵母80Sリボソームの結晶構造を取得するために,X線結晶学を用いた.
- 高解像度 (3.0アングストーム) の構造データを収集,分析した.
- コンピューターモデリングは,リボソームRNA (rRNA) とタンパク質を含むリボソームの原子モデルを構築するために使用されました.
主要な成果:
- Saccharomyces cerevisiaeの80Sリボソームの結晶構造は3.0アングストームの解像度で決定されました.
- 原子モデルには,ほぼ全てのリボソームのRNA塩基とタンパク質のサイドチェーン,および真核生物特異のタンパク質Stm1.1が含まれています.
- 構造は,真核生物特有の要素の詳細な構造,保存されたコアとの統合,およびサブユニット間の架け橋を明らかにします.
結論:
- 酵母80Sリボソームの原子モデルは,真核転写に関する前例のない構造的洞察を提供します.
- この構造的枠組みは,真核細胞の翻訳機構を調査する実験の設計と解釈を容易にする.
- この発見は,真核生物と真核生物の間のリボソームの進化的分岐を理解するのに役立ちます.
関連する概念動画
Ribosomes
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...
Ribosomes
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...
Ribosomes
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...
Ribosomes
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...
Ribosome Profiling
Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
Applications of ribosome profiling
Ribosome profiling has many applications, including in vivo monitoring of translation inside a particular organ or tissue type and quantifying new protein synthesis levels.
The technique helps...
Applications of ribosome profiling
Ribosome profiling has many applications, including in vivo monitoring of translation inside a particular organ or tissue type and quantifying new protein synthesis levels.
The technique helps...
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,...

