拡張されたシャイン-ダルガーノモチーフは,Staphylococcus aureusにおける翻訳開始を制御する
Maximilian P Kohl1, Roberto Bahena-Ceron2, Béatrice Chane-Woon-Ming1
1Université de Strasbourg, CNRS, Architecture et Réactivité de l'ARN, Strasbourg, France.
Nature communications
|February 12, 2026
まとめ
Staphylococcus aureusは,拡張されたShine-Dalgarno相互作用と注釈されていない小さなORFを含むユニークな翻訳開始メカニズムを使用して,バイオフィルムを適応させ形成します. これらの種特有の特徴は,E. coliなどの他の細菌と異なる.
科学分野:
- 微生物学 微生物学とは
- 分子生物学は分子生物学である.
- バクテリアの遺伝学
背景:
- トランスレーションの開始は,細菌の適応に極めて重要です.
- 翻訳開始の種固有のメカニズムは十分に理解されていません.
- 黄金球菌 (Staphylococcus aureus) は,ヒトにとって重要な病原体である.
研究 の 目的:
- Staphylococcus aureus.の翻訳開始部位をマッピングするために.
- 翻訳開始の種特有のメカニズムを理解するために.
- 翻訳制御における上流ORF (uORF) の役割を調査する.
主な方法:
- 翻訳開始サイトの高解像度マッピング.
- mRNA-リボソーム複合体の冷凍電子顕微鏡 (cryo-EM)
- バクテリアのリボソーム解読の比較分析.
主要な成果:
- 拡張されたシャイン-ダルガーノ (SD) 相互作用を含む,S. aureusにおける明確な翻訳開始特徴を特定した.
- 数多くの注釈のない小さな開いた読書フレーム (ORF) を発見した.
- S. aureusの開始部位がE. coliのリボソームによって常に認識されるわけではないことが示されました.
- 栄養素感知とバイオフィルム形成を結びつける新しいuORF媒介トランスレーション制御メカニズムを特徴付けました.
結論:
- S. aureusは,適応のためのユニークな翻訳開始戦略を採用しています.
- 拡張SD相互作用は,他の細菌に対する特異性を与える.
- uORFの翻訳は,栄養素感知経路を通じてバイオフィルム形成を調節する.
関連する概念動画
Initiation of Translation
39.2K
Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
39.2K
Initiation of Translation
8.2K
8.2K
Translation
157.3K
Lesson: Translation
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of...
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of...
157.3K
Translation
18.1K
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of Life
Proteins are...
Translation Produces the Building Blocks of Life
Proteins are...
18.1K
Termination of Translation
27.9K
The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
27.9K
Improving Translational Accuracy
15.0K
Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
15.0K


