トランス作用のリボスイッチは,Listeria monocytogenesのウイルス性レギュレータPrfAの発現を制御する
Edmund Loh1, Olivier Dussurget, Jonas Gripenland
1Department of Molecular Biology, Umeå University, 90187 Umeå, Sweden.
Cell
|November 17, 2009
まとめ
Listeria monocytogenes の2つのS-アデノシルメチオニン (SAM) リボスイッチ,SreAとSreBは,PrfA調節器を制御することによって,細菌の毒性の遺伝子発現を制御し,トランスで機能することができます. これは,栄養素の利用可能性と毒性を結びつけるノンコーディングRNAの新種のクラスを明らかにします.
科学分野:
- バクテリア学 バクテリア学
- 分子生物学は分子生物学である.
- RNA 生物学 RNA 生物学
背景:
- リボスイッチは,代謝物質によって引き起こされる構造的変化を通じて遺伝子発現を調節するシス作用RNA要素です.
- S-アデノシルメチオニン (SAM) は,様々な細胞プロセスに関与する重要な代謝物質です.
- 細菌の毒性は,しばしば複雑な遺伝ネットワークによって制御される.
研究 の 目的:
- Listeria monocytogenesにおけるSAMリボスイッチSreAとSreBの規制的な役割を調査する.
- これらのリボスイッチが非コーディングRNAとしてトランスで機能できるかどうかを判断する.
- 栄養素の利用可能性と細菌の毒性の関係を解明する.
主な方法:
- Listeria monocytogenesにおけるSreAとSreBの遺伝子解析について.
- ウイルス性レギュレータ PrfA.のmRNAおよびタンパク質発現分析
- リボスイッチの活動を評価するためのリポーターアッセイ.
主要な成果:
- SreAとSreBは,トランスで機能し,規制性非コーディングRNAとして作用することが判明しました.
- これらのリボスイッチは,PrfA mRNAの5'-untranslated領域と結合する.
- SreAとSreBの削除により,PrfAレベルが上昇し,毒性の遺伝子発現が強化されました.
結論:
- SAMリボスイッチSreAとSreBは,Listeria monocytogenesにおける新しいトランス作用の規制的役割を果たしています.
- これらのリボスイッチは,細胞内SAMレベルを細菌の毒性の調節と結びつける.
- バクテリアの病原化に関与する新しい種類の規制性ノンコーディングRNAが特定されました.
関連する概念動画
Types of RNA
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...
Prokaryotic Transcriptional Activators and Repressors
The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
Transcription of prokaryotic...
Transcription of prokaryotic...
Riboswitches
Riboswitches are non-coding mRNA domains that regulate the transcription and translation of downstream genes without the help of proteins. Riboswitches bind directly to a metabolite and can form unique stem-loop or hairpin structures in response to the amount of the metabolite present. They have two distinct regions – a metabolite-binding aptamer and an expression platform.
The aptamer has high specificity for a particular metabolite which allows riboswitches to specifically regulate...
The aptamer has high specificity for a particular metabolite which allows riboswitches to specifically regulate...
Prokaryotic Transcriptional Activators and Repressors
The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
Transcription of prokaryotic...
Transcription of prokaryotic...
Transcriptional Regulation: Riboswitches
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...
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,...


