関連する実験動画
Updated: Jun 27, 2026

07:44
High-throughput Purification of Affinity-tagged Recombinant Proteins
Published on: August 26, 2012
まとめ
人間のrRNAプロモーターは,転写を開始するために2つのタンパク質,UBF1とSL1を必要とします. UBF1は上流制御要素と結合し,SL1をRNAポリメラーゼIトランスクリプションを活性化させるように勧誘する.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝子規制 遺伝子規制
- バイオケミストリー バイオケミストリー
背景:
- 人間のリボソームRNA (rRNA) プロモーターは,RNAポリメラーゼIによる細胞転写に不可欠です.
- それは,トランス活性化タンパク質を結合するコアとアップストリーム制御要素 (UCE) を特徴としています.
研究 の 目的:
- 人間のrRNA遺伝子転写の開始における特定の転写因子SL1とUBF1の役割を解明する.
- UCEにおけるタンパク質-DNA相互作用のメカニズムとその転写効率への影響を理解する.
主な方法:
- 転写因子SL1.1の浄化
- タンパク質とDNAの結合相互作用を分析するためのDNAアース足跡測定法.
- 機能的影響を評価するために,変異性およびハイブリッドrRNAプロモーターの分析.
主要な成果:
- SL1単独では,rRNAプロモーターに特異的に結合しません.
- UBF1はUCEを結合し,SL1をプロモーター領域に勧誘する.
- UCEにおけるタンパク質-DNA相互作用は,rRNA合成効率を調節する.
結論:
- 人間のrRNA転写の開始には,UBF1がDNA結合を媒介し,SL1が活性化を誘発するユニークなメカニズムが含まれています.
- UCEにおけるUBF1とSL1の相互作用は,効率的なrRNA合成に不可欠である.
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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...
RNA Polymerase II Accessory Proteins
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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:
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...
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...
Translational Regulation
Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...