関連する実験動画
Updated: Jul 13, 2026

07:44
High-throughput Purification of Affinity-tagged Recombinant Proteins
Published on: August 26, 2012
トランスクリプション開始因子TFIIFFの大型サブユニットのcDNAの特徴づけ
T Aso1, H A Vasavada, T Kawaguchi
1Department of Genetics, Yale University School of Medicine, New Haven, Connecticut 06510.
Nature
|January 30, 1992
まとめ
一般的な転写因子TFIIFはRNAポリメラーゼIIと結合し,転写の開始を促進する. そのサブユニットであるRAP30とRAP74は,相互作用し,この重要な細胞過程で役割を果たします.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
- 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による正確な転写開始には,複数の一般的な転写因子が含まれます.
- TFIIF (FC,RAP30/74,β/gammaとも呼ばれる) は,このプロセスの重要な要素である.
- 以前の研究では,トランスクリプション開始複合体の形成におけるTFIIFの役割が示唆されている.
研究 の 目的:
- RNAポリメラーゼII転写におけるTFIIFの役割と特性を調査する.
- TFIIFのサブユニット,特にRAP30とRAP74をクローンして特徴づけること.
- TFIIFのサブユニット間の相互作用とその機能的影響を理解する.
主な方法:
- 転写因子の染色学的な分離.
- 転写開始の運動学的研究.
- 転写始動複合体の電泳と分断.
- テンプレートコンテスト実験.
- RAP74の部分シーケンシングとcDNAクローニング.
- RAP30とRAP74のインビトロとインビボの相互作用研究
主要な成果:
- TFIIFはRNAポリメラーゼIIに直接結合し,非特異性DNAへの親和性を減少させます.
- TFIIFは,トランスクリプション開始複合体の形成の中間段階で作用します.
- TFIIFの小さなサブユニット (RAP30) は,細菌のシグマ因子と同一性を示しています.
- RAP74サブユニットはクローンされ,その製品はRAP30と相互作用します.
- RAP74の予測されたアミノ酸配列にはヘリカーゼモチーフが欠けていますが,充電された領域が含まれています.
結論:
- TFIIFは,RNAポリメラーゼIIによる正確な転写開始に不可欠である.
- RAP30とRAP74の相互作用は,TFIIFの機能にとって極めて重要です.
- TFIIFのメカニズムは,RNAポリメラーゼII-DNAの相互作用を調節することを含む可能性があります.
- TFIIFサブユニットの正確な機能と構造的動機を明らかにするために,さらなる研究が必要である.
さらに関連する動画
関連する概念動画
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 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...
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...
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...

