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関連する概念動画

tRNA Activation02:26

tRNA Activation

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Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...
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tRNA Activation02:26

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Yeast Signaling

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Yeasts are single-celled organisms, but unlike bacteria, they are eukaryotes (cells with a nucleus). Cell signaling in yeast is similar to signaling in other eukaryotic cells. A ligand, such as a protein or a small molecule released from a yeast cell, attaches to a receptor on the cell surface. The binding stimulates second-messenger kinases to activate or inactivate transcription factors that further regulate gene expression. Many of the yeast intracellular signaling cascades have similar...
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Chromatin Structure Regulates pre-mRNA Processing02:41

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In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
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One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases.
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Ribozymes02:47

Ribozymes

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The term ribozyme is used for RNA that can act as an enzyme. Ribozymes are mainly found in selected viruses, bacteria, plant organelles, and lower eukaryotes. Ribozymes were first discovered in 1982 when Tom Cech’s laboratory observed Group I introns acting as enzymes. This was shortly followed by the discovery of another ribozyme, Ribonulcease P, by Sid Altman’s laboratory. Both Cech and Altman received the Nobel Prize in chemistry in 1989 for their work on ribozymes.
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Updated: Feb 4, 2026

In vitro tRNA Methylation Assay with the Entamoeba histolytica DNA and tRNA Methyltransferase Dnmt2 Ehmeth Enzyme
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酵母リボヌクレアゼPによる前駆体tRNA処理に関する構造的洞察

Pengfei Lan1, Ming Tan2,3, Yuebin Zhang4

  • 1Shanghai Institute of Precision Medicine, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200125, China.

Science (New York, N.Y.)
|September 29, 2018
PubMed
まとめ

重要な酵素であるリボヌクレアゼP (RNase P) は,構造的に単体およびプレ- tRNAで分析されました. アンカーで誘導されるフック状のタンパク質はRNAを安定させ,tRNA前処理を可能にします.

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Last Updated: Feb 4, 2026

In vitro tRNA Methylation Assay with the Entamoeba histolytica DNA and tRNA Methyltransferase Dnmt2 Ehmeth Enzyme
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科学分野:

  • 分子生物学
  • 構造生物学
  • 生物化学

背景:

  • リボ核酶P (RNase P) は,tRNAの成熟に不可欠な重要なリボ酵素である.
  • これは前駆体tRNA (pre- tRNA) の5'- リーダー配列を処理する.
  • そのメカニズムを理解することは tRNA 生成の鍵です

研究 の 目的:

  • Saccharomyces cerevisiae RNase Pの冷凍電子顕微鏡構造を決定する
  • tRNA前結合と触媒の構造的基礎を解明する.
  • ユカリオットRNase P機能の分子理解を提供するために.

主な方法:

  • クリオ電子顕微鏡 (cryo-EM) で 3.5 アングストームの解像度.
  • RNase P単独およびプレ-tRNAPheとの複合体の構造分析
  • 分子ダイナミクスシミュレーションで 反応経路を調べる

主要な成果:

  • 酵母RNase Pのタンパク質成分は,プレ-tRNAを結合するフック状の構造を形成する.
  • この構造は,L型tRNAを認識するアンカーを備えた"測定装置"として機能します.
  • 触媒性マグネシウムイオンは,保存されたRNA要素とtRNA前基板によって調整され,基板結合により構成変化が誘発される.

結論:

  • この研究は,酵母RNase Pの詳細な構造と,tRNA前との相互作用を明らかにした.
  • tRNA前分裂のための2つの金属イオンSN2経路を含む分子メカニズムが提案されています.
  • これらの発見は,真核RNase Pによるプレ-tRNAの処理に関する洞察を提供します.