関連する実験動画
Updated: May 3, 2026

07:44
High-throughput Purification of Affinity-tagged Recombinant Proteins
Published on: August 26, 2012
17.8K
RNAポリメラーゼ構造の局所的な再折り畳みによる転写不活性化
Georgiy A Belogurov1, Marina N Vassylyeva, Anastasiya Sevostyanova
1Department of Microbiology, The Ohio State University, 484 West 12th Avenue, Columbus, Ohio 43210, USA.
Nature
|October 24, 2008
まとめ
ミキソピロニン抗生物質は,転写開始複合体の形成を阻害することによって,細菌のRNAポリメラーゼ (RNAP) を阻害する. 構造的研究は,dMyx結合がRNAPスイッチ-2を安定させ,DNA溶解の伝播を妨げることを明らかにしています.
科学分野:
- 微生物学 微生物学とは
- 構造生物学 構造生物学とは
- ドラッグ・ディスカバリー・ディスカバリー・ドラッグ・ディスカバリー・ドラッグ・ディスカバリー
背景:
- 抗生物質の構造の研究は,薬物の設計を支援し,分子メカニズムを明らかにします.
- ミキソピロニン抗生物質は,未定のメカニズムによって細菌のRNAポリメラーゼ (RNAP) を阻害する.
研究 の 目的:
- ミクソピロニンがバクテリアのRNAPを抑制する構造的基礎を解明する.
- dMyxとThermus thermophilus RNAPホロ酵素の相互作用を特徴づけるために.
主な方法:
- Thermus thermophilus RNAPホロ酵素によるdMyxの複雑な構造を決定するためのX線結晶学.
- DNAフットプリント測定は,dMyxがDNA溶解に与える影響を評価するために行われます.
主要な成果:
- 抗生物質dMyxは,DNAテンプレート鎖の近くにあるRNAPクランプヘッド領域のポケットに結合します.
- dMyx結合はβ'-サブユニットスイッチ-2セグメントを安定させ,活性部位へのDNA溶解の伝播を阻害する.
- スイッチ-2の変異はdMyx効果を模倣し,規制チェックポイントとしての役割を示唆した.
結論:
- ミキソピロニンは,前触媒転写開始複合体を標的とした新しい抗生物質のクラスを表しています.
- この研究は,dMyxの作用のメカニズムを提案し,DNAの負荷と調節におけるRNAPスイッチ-2の役割を強調しています.
関連する概念動画
Types of RNA
61.3K
Overview
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
61.3K
Chromatin Structure Regulates pre-mRNA Processing
6.6K
In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
The chromatin structure, especially...
6.6K
Transcription Attenuation in Prokaryotes
14.6K
Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure. Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
There are several different mechanisms used to attenuate transcription. In ribosome mediated...
There are several different mechanisms used to attenuate transcription. In ribosome mediated...
14.6K
Bacterial Transcription
25.6K
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:
25.6K
Types of RNA
13.9K
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in regulating gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA Performs Diverse...
RNA Performs Diverse...
13.9K
Transcriptional Regulation: Riboswitches
1.2K
Riboswitches are RNA elements that regulate gene expression by altering their secondary structures in response to specific effector molecules. These elements, located in the leader regions of certain mRNAs, act as transcriptional regulators by toggling between alternative conformations to control downstream gene expression. Riboswitch-mediated regulation is a precise mechanism for modulating biosynthetic pathways, as exemplified by the riboflavin biosynthesis pathway in Bacillus...
1.2K

