関連する実験動画
Updated: Aug 14, 2026

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High-throughput Purification of Affinity-tagged Recombinant Proteins
Published on: August 26, 2012
RNAポリメラーゼIIによるトランスクリプションにおけるTBPのないTAF(II) 含有複合体の機能
1Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS/INSERM/ULP, Illkirch, CU de Strasbourg, France.
Nature
|May 29, 1998
まとめ
研究者らは,TFIIDなしで遺伝子転写を開始する新しいタンパク質複合体を発見した. このTBPフリー複合体は,細胞内のRNAポリメラーゼII転写の代替経路を示唆し,遺伝子調節に影響を与える.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝子規制 遺伝子規制
- バイオケミストリー バイオケミストリー
背景:
- RNAポリメラーゼIIによる遺伝子転写のイニシアチブには,プリイニシアチブコンプレックスアセンブリが含まれています.
- このアセンブリは,伝統的に,プロモーターに拘束するTFIIDによって独占的に核化されていると考えられています.
研究 の 目的:
- 転写開始の代替メカニズムを調査する.
- RNAポリメラーゼII転写に関与する新しいタンパク質複合体を特徴付ける.
主な方法:
- 新しい多タンパク質複合体の分離と特徴付け.
- TATAを含むプロモーターおよびTATAのないプロモーターを用いたインビトロ転写アッセイ.
- 抗TBP抗体を用いて,TBPから独立した活性性を評価する.
主要な成果:
- TAF (II) と他のタンパク質で構成されるTBPフリーマルチタンパク質複合体が特定されました.
- この複合体は,さまざまなプロモーターに転写を開始する際にTFIIDを成功裏に置き換えました.
- 抗TBP抗体によって,複合体の活性に影響されず,TBP独立機能が確認されました.
結論:
- TBP のないRNAポリメラーゼIIの転写は哺乳類の細胞で可能である.
- 複数のプレイニシテーション複合体は,別の経路を通じて遺伝子発現を調節する可能性があります.
関連する概念動画
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...
Transcription Elongation Factors
Transcription elongation is a dynamic process that alters depending upon the sequence heterogeneity of the DNA being transcribed. Hence, it is not surprising that the elongation complex's composition also varies along the way while transcribing a gene.
The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA into a...
The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA into a...
Transcription Initiation
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...
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...
General Transcription Factors
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
Transcription Elongation Factors
Transcription elongation is a dynamic process that alters depending upon the sequence heterogeneity of the DNA being transcribed. Hence, it is not surprising that the elongation complex's composition also varies along the way while transcribing a gene.
The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA into a...
The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA into a...

