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Updated: Jun 18, 2026

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High-throughput Purification of Affinity-tagged Recombinant Proteins
Published on: August 26, 2012
RNAポリメラーゼプロモーターの構造的組織は,オープン複合体である
N Naryshkin1, A Revyakin, Y Kim
1Howard Hughes Medical Institute, Department of Chemistry, Rutgers University, Piscataway, New Jersey 08854, USA.
Cell
|July 13, 2000
まとめ
研究者らは,細菌のRNAポリメラーゼ (RNAP) とプロモーターDNAの相互作用を,フォトクロスリンクを用いてマッピングした. この詳細な地図は,RNAP-プロモーターオープン複合体 (RPo) のタンパク質-DNA結合と,アクティベータがその構造にどのように影響するかを示しています.
科学分野:
- 分子生物学は分子生物学である.
- バイオケミストリー バイオケミストリー
- 構造生物学 構造生物学とは
背景:
- バクテリアのRNAポリメラーゼ (RNAP) は,転写の開始に不可欠です.
- オープンコンプレックス (RPo) でのRNAPプロモーターDNA相互作用を理解することは,遺伝子調節を解読する鍵です.
- 以前のモデルでは,これらの相互作用の詳細な原子レベルの解像度が欠けていました.
研究 の 目的:
- RNAP-プロモーターオープン複合体 (RPo) 内のタンパク質-DNA相互作用を正確にマッピングする.
- 実験的なクロスリンクデータに基づいて,RPOの詳細な構造モデルを構築する.
- RPo.に転写活性化剤の構造的影響を調査する.
主な方法:
- 組織的なサイト固有のタンパク質-DNAのフォトクロスリンクを採用した.
- RNAPサブユニットとプロモーターDNAリン酸塩の間の100以上の異なるクロスリンクをマッピングしました.
- クロスリンクデータを活用して,高解像度のRPo.Po.構造モデルを構築しました.
主要な成果:
- RPo.で100以上のタンパク質-DNAクロスリンクの包括的な地図を提供しました.
- 特定のRNAPセグメントとDNAリン酸塩の間の詳細な接触点を確立しました.
- 触媒的に有能な RPo.Po.の洗練された構造モデルの構築を可能にしました.
結論:
- この研究は,RNAP-プロモーターDNAの相互作用に関する前例のない詳細な見解を提供します.
- 生成されたRPOの構造モデルは,転写開始を理解するための基礎として機能します.
- この方法論は,トランスクリプションアクティベーターがRPO構造をどのように調節するかを分析することを可能にします.
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...
The Eukaryotic Promoter Region
The eukaryotic promoter region is a segment of DNA located upstream of a gene. It contains an RNA polymerase binding site, a transcription start site, and several cis-regulatory sequences. The proximal promoter region is located in the vicinity of the gene and has cis-regulatory sequences and the core promoter. The core promoter is the binding site for RNA polymerase and is usually located between -35 and +35 nucleotides from the transcription start site. The distal promoter regions are...
Bacterial Transcription
RNA polymerase (RNAP) carries out DNA-dependent RNA synthesis in both bacteria and eukaryotes. Bacteria do not have a membrane-bound nucleus. So, transcription and translation occur simultaneously, on the same DNA template.
Transcription can be divided into three main stages, each involving distinct DNA sequences to guide the polymerase. These are:
Transcription can be divided into three main stages, each involving distinct DNA sequences to guide the polymerase. These are:
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...
The Eukaryotic Promoter Region
The eukaryotic promoter region is a segment of DNA located upstream of a gene. It contains an RNA polymerase binding site, a transcription start site, and several cis-regulatory sequences. The proximal promoter region is located in the vicinity of the gene and has cis-regulatory sequences and the core promoter. The core promoter is the binding site for RNA polymerase and is usually located between -35 and +35 nucleotides from the transcription start site. The distal promoter regions are...

