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U6-U4RNA複合体から派生したRNAドメインの触媒活性
J H Yang1, R Cedergren, B Nadal-Ginard
1Howard Hughes Medical Institute, Department of Cellular and Molecular Physiology, Harvard Medical School, Boston, MA.
まとめ
プレ-mRNAスプライシングに不可欠なU6-U4RNA複合体は,ハンマーヘッドリボ酵素に似た保存ドメインを有しています. 特定の変異により,この複合体はRNA分裂活性を示すことができ,スプライシングにおける触媒的役割を示唆する.
科学分野:
- 分子生物学は分子生物学である.
- RNAのカタリシス
- 遺伝子発現の表現について
背景:
- U6RNAは,核前駆メッセンジャーRNA (pre-mRNA) のスプライシングに不可欠である.
- U6-U4 RNA複合体の構造は,異なる種にわたって保存されています.
- U6-U4複合体内の保存ドメインは,ハンマーヘッドRNAモチーフとの類似性を共有しています.
研究 の 目的:
- U6-U4RNA複合体の潜在的触媒活性について調査する.
- U6RNAの保存されたハンマーヘッドのようなドメインの機能的重要性を探求する.
- RNAの改変がU6-U4複合体に触媒的性質を与えるかどうかを判断する.
主な方法:
- U6-U4 RNA複合体の二次構造の比較分析.
- U6およびU4RNAのサイト指向型変異.
- In vitro RNA クリーバージ アッセイ.
- RNA基板水解の特徴について.
主要な成果:
- U6-U4RNA複合体の保存ドメインは,ハンマーヘッドRNAモチーフを模倣する.
- 哺乳類のU6-U4複合体は,固有の触媒活性を示さなかった.
- U6とU4RNAにおける特定の核酸代用は,RNAの分裂活性を誘導した.
- 孤立した保存ドメインは,RNA基板分裂を含むハンマーヘッドリボ酵素の特徴を示した.
結論:
- U6-U4 RNA複合体には,機能的なハンマーヘッドリボエンザイムのようなドメインが含まれています.
- RNAの改変は,U6-U4複合体内の潜在的触媒的ポテンシャルを活性化することができます.
- この触媒ドメインは,プレ-mRNAスプライシングメカニズムに役割を果たす可能性があります.
関連する概念動画
Bacterial RNA Polymerase
Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
Eukaryotic RNA Polymerases
RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
All three eukaryotic RNAPs require specific transcription factors, of which the...
All three eukaryotic RNAPs require specific transcription factors, of which the...
tRNA Activation
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Initiation is the first step of transcription in eukaryotes. Prokaryotic RNA Polymerase (RNAP) can bind to the template DNA and start transcribing. On the other hand, transcription in eukaryotes requires additional proteins, called transcription factors, to first bind to the promoter region in the DNA template. This binding helps recruit the specific RNAP that can assemble on the DNA and start transcription.
The promoters and enhancers and their accessory proteins allow tight regulation of...
The promoters and enhancers and their accessory proteins allow tight regulation of...
Bacterial RNA Polymerase
Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
Eukaryotic RNA Polymerases
RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
All three eukaryotic RNAPs require specific transcription factors, of which the...
All three eukaryotic RNAPs require specific transcription factors, of which the...

