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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の遠隔部位間の通信は,ユビキチル化因子とポリメラーゼCTDを介して行われる
Baggavalli P Somesh1, Stefan Sigurdsson, Hideaki Saeki
1Mechanisms of Transcription Laboratory, Cancer Research UK London Research Institute, Clare Hall Laboratories, South Mimms, UK.
Cell
|April 10, 2007
まとめ
転写停止は,RNAポリメラーゼII (RNAPII) の至る所に存在することを引き起こします. Rsp5 ダイマーと Ubc5 を含むカップリングされた改変メカニズムは,延伸と DNA 修復の間にRNAPII 普遍性を説明します.
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
- 遺伝学 遺伝学とは
背景:
- ユビキティレーションは,タンパク質の機能を調節する重要な翻訳後の修正である.
- RNAポリメラーゼII (RNAPII) は,遺伝子転写のための中心的な酵素である.
- RNAPIIの普遍化は,転写の調節とDNA損傷反応と関連しています.
研究 の 目的:
- 酵母RNAPII.のユビキティレーションサイトをマッピングする.
- RNAPII全在化のメカニズムと特異性を解明する.
- トランスクリプションの延長とDNA損傷反応におけるユビキティレーションの役割を理解する.
主な方法:
- サイト・ディレクテッド・ミュータジェネシス (SITE-DIRECTED MUTAGENESIS) は,ユビキティレーション・サイトを特定するためのものです.
- インビトロおよびインビボのユビキティレーションアッセイ.
- RNAPII C端末領域 (CTD) の構造と相互作用の分析.
- E3リガゼ (Rsp5) とE2結合酵素 (Ubc5) の相互作用を研究するための生化学分析.
主要な成果:
- イーストRNAPII.の2つの結合ユビキティレーション部位を特定しました.
- RNAPII CTDのRsp5ダイマーがユビキティレーションを媒介することを示した.
- Ubc5 (E2) がRNAPIIとRSP5 (E3) を橋渡しして修正することを示した.
- 遠隔のユビキティレーションサイトがCTDの相互作用を通じて通信することを明らかにした.
- 延伸とDNA損傷反応におけるRNAPII全在化の役割を確立した.
結論:
- RNAPIIのユビキチテレーションは,Rsp5ダイマーによって制御される特定のカップリングされたプロセスです.
- このメカニズムは,CTDの折りたたみによる遠隔サイト間の通信を伴う.
- E2酵素は,ユビキティレーションのための基板認識において重要な役割を果たします.
- この研究は,転写調節とDNA修復経路についての洞察を提供します.
関連する概念動画
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...
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...
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...

