関連する実験動画
Updated: May 31, 2026

13:19
Chemical Triphosphorylation of Oligonucleotides
Published on: June 2, 2022
シングルサブユニットRNAポリメラーゼによるトランスクリプト開始の反応経路における時間分解のイベント:ラマン結晶学的証拠
Yuanyuan Chen1, Ritwika Basu, Michael L Gleghorn
1Department of Biochemistry, Case Western Reserve University, Cleveland, Ohio 44106, United States.
Journal of the American Chemical Society
|July 13, 2011
まとめ
この研究では,ラマン顕微鏡を用いて,N4ファグRNAポリメラーゼ (RNAP) のナクレオチジル伝達反応をリアルタイムで観察した. 発見は,フォスフォディエステル結合形成の重要なステップと,触媒処理中の酵素構成の変化を明らかにしています.
科学分野:
- バイオケミストリー バイオケミストリー
- 分子生物学は分子生物学である.
- 構造生物学 構造生物学とは
背景:
- N4ファグRNAポリメラーゼ (RNAP) は,ウイルスのRNA複製に不可欠である.
- リン酸エステル結合形成の運動学を理解することは,RNAPの機能を理解する鍵です.
研究 の 目的:
- N4ファグRNAP単一結晶におけるナクレオチジル伝達反応をリアルタイムでモニターする.
- カタリシス中の構造変化と基板/金属結合ダイナミクスを解明する.
主な方法:
- 単一のRNAP-DNA複合結晶のリアルタイムラマン顕微鏡.
- 核酸三酸塩 (NTP) サブストラットと二価イチオンの水晶浸漬.
- 同位体でラベル付けされたNTPとX線結晶学データを利用してスペクトル割り当て.
主要な成果:
- 2〜7分以内に基板結合とO-ヘリクスの形状の変化が観察されました.
- トラッキングされた二価金属結合とリボース三リン酸コンフォームの変化.
- フォスフォディエステル結合形成は,約15分で完了し,金属は約40分で放出されます.
結論:
- O-ヘリックス運動は,基板結合によってのみ誘発することができます.
- 晶体内の反応動態学は,さらなる研究のために一時的な中間物質を明らかにします.
- この研究は,分子レベルでRNAP触媒のダイナミックな見方を提供しています.
関連する概念動画
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...
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...
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...
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...
Ribosomal RNA Synthesis
Ribosome synthesis is a highly complex and coordinated process involving more than 200 assembly factors. The synthesis and processing of ribosomal components occurs not only in the nucleolus but also in the nucleoplasm and the cytoplasm of eukaryotic cells.
Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...
Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...

