関連する実験動画
Updated: Jul 19, 2026

07:44
High-throughput Purification of Affinity-tagged Recombinant Proteins
Published on: August 26, 2012
まとめ
一般的な転写因子であるBTF3は,正確な転写開始に不可欠です. 浄化されたBTF3はRNAポリメラーゼB (II) に結合し,DNAと相互作用することなく活性転写複合体を形成します.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝子転写 遺伝子転写
- タンパク質対タンパク質の相互作用
背景:
- 正確な転写開始は,遺伝子発現に不可欠です.
- RNAポリメラーゼB (II) はmRNA合成の中心的な酵素である.
- 一般的な転写因子は,転写において規制的な役割を果たします.
研究 の 目的:
- 一般転写因子BTF3.3を精製し,特徴づけること.
- 転写開始におけるBTF3の役割を調査する.
- BTF3のRNAポリメラーゼB (II) とDNAとの相互作用を決定する.
主な方法:
- HeLa細胞抽出物からBTF3を浄化する.
- アデノウイルス-2 主要遅発プロモーター (Ad2MLP) を用いたインビトロ転写アッセイ.
- タンパク質-DNAとタンパク質-タンパク質の相互作用の分析.
主要な成果:
- BTF3は27 kDaのタンパク質として精製されました.
- BTF3は,Ad2MLPおよび他のRNAポリメラーゼBプロモーターから正確な転写を開始するために必要です.
- 浄化されたBTF3はRNAポリメラーゼB (II) に結合し,転写活性複合体を形成する.
- BTF3は,DNAと相互作用したり,プレイニシテーション複合体の形成に不可欠ではないようです.
結論:
- BTF3は,RNAポリメラーゼB (II) と直接相互作用する一般的な転写因子です.
- BTF3の機能は,DNAの相互作用ではなく,ポリメラーゼ結合による転写開始を促進することを含む.
- これらの発見は,真核生物の遺伝子転写の調節における重要なメカニズムを明らかにしています.
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...
RNA Polymerase II Accessory Proteins
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
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...
RNA Polymerase II Accessory Proteins
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...

