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関連する概念動画

Ribosomes01:27

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 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...
Ribosomes01:27

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 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...
Riboswitches01:56

Riboswitches

Riboswitches are non-coding mRNA domains that regulate the transcription and translation of downstream genes without the help of proteins. Riboswitches bind directly to a metabolite and can form unique stem-loop or hairpin structures in response to the amount of the metabolite present. They have two distinct regions – a metabolite-binding aptamer and an expression platform.
The aptamer has high specificity for a particular metabolite which allows riboswitches to specifically regulate...
Ribozymes02:47

Ribozymes

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.
Ribozymes can be...
Ribozymes02:47

Ribozymes

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.
Ribozymes can be...
Ribosomes01:27

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...

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関連する実験動画

Updated: Jul 13, 2026

Localized RNAi and Ectopic Gene Expression in the Medicinal Leech
16:19

Localized RNAi and Ectopic Gene Expression in the Medicinal Leech

Published on: April 17, 2008

枝分かれによるキャピング:新しいリボ酵素は,小さなラリアットを作ります.

Anna Marie Pyle1

  • 1Department of Molecular Biophysics and Biochemistry, Howard Hughes Medical Institute, Yale University, 266 Whitney Avenue, Bass Building Room 334, New Haven, CT 06520, USA.

Science (New York, N.Y.)
|September 6, 2005
PubMed
まとめ

科学者たちは,既知のRNA酵素を拡張する新しい分岐リボ酵素を発見した. この新しい酵素は,群Iのイントロンと驚くべき進化的つながりを共有しています.

科学分野:

  • バイオケミストリー バイオケミストリー
  • 分子生物学は分子生物学である.
  • RNAのカタリシス

背景:

  • 自然に存在するRNA酵素,またはリボ酵素は,様々な細胞プロセスにおいて重要な役割を果たします.
  • 既知のリボ酵素の多様性は歴史的に限られており,その触媒的可能性の完全な理解を妨げています.
  • グループIイントロンは,RNAスプライシングやその他の遺伝子操作に関与する,既知の触媒RNAである.

研究 の 目的:

  • 新しいタイプの分岐型リボ酵素の発見と特徴を報告する.
  • この新しいリボ酵素の進化的および機械的関係を調査する.

主な方法:

  • 触媒活性を決定する生化学的測定法.
  • 配列分析と系統遺伝的比較.
  • 構造的予測と機能的ドメインマッピング.

主要な成果:

  • 独特の触媒特性を持つ新しい分岐リボ酵素の特定.
  • 新しいリボエンザイムとグループIのイントロンの間の予期せぬ配列と構造的な類似性の実証.
  • 系統遺伝学的分析は,潜在的な進化的つながりを示唆しています.

さらに関連する動画

Nanomanipulation of Single RNA Molecules by Optical Tweezers
06:59

Nanomanipulation of Single RNA Molecules by Optical Tweezers

Published on: August 20, 2014

Chemical Triphosphorylation of Oligonucleotides
13:19

Chemical Triphosphorylation of Oligonucleotides

Published on: June 2, 2022

関連する実験動画

Last Updated: Jul 13, 2026

Localized RNAi and Ectopic Gene Expression in the Medicinal Leech
16:19

Localized RNAi and Ectopic Gene Expression in the Medicinal Leech

Published on: April 17, 2008

Nanomanipulation of Single RNA Molecules by Optical Tweezers
06:59

Nanomanipulation of Single RNA Molecules by Optical Tweezers

Published on: August 20, 2014

Chemical Triphosphorylation of Oligonucleotides
13:19

Chemical Triphosphorylation of Oligonucleotides

Published on: June 2, 2022

結論:

  • この分岐リボ酵素の発見は,既知のRNA酵素の多様性を大幅に拡大する.
  • この発見は,これまで考えられていたより,異なる種類のリボ酵素の間の進化的関係がより深いことを示唆している.
  • この研究は,RNAの進化と触媒メカニズムを理解するための新しい道を開きます.