リボソーム上のmRNAのトランスレーションオペレータ:抑制タンパク質がリボソーム結合を排除する方法
Lasse Jenner1, Pascale Romby, Bernard Rees
1Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch, France.
まとめ
この研究は,メッセンジャーRNA (mRNA) 構造が細菌のリボソームに結合する方法を明らかにし,抑制タンパク質による翻訳調節のメカニズムを説明します. このリボソーム-mRNAの相互作用を理解することは,遺伝子発現を制御するための鍵です.
科学分野:
- 構造生物学 構造生物学とは
- 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
背景:
- リボソームは,タンパク質合成を司る細胞機構である.
- メッセンジャーRNA (mRNA) は,DNAからリボソームに遺伝情報を伝達する.
- 翻訳操作者は,タンパク質合成を制御するmRNAの規制要素である.
研究 の 目的:
- Thermus thermophilus リボソームに結合するmRNAの構造的基礎を決定する.
- 翻訳事業者が翻訳の開始を規制するメカニズムを明らかにする.
- 抑制タンパク質がmRNA結合リボソームとどのように相互作用するかを理解する.
主な方法:
- Thermus thermophilus リボソームの共結晶化とイニシアター転送RNA (tRNA) と構造化されたmRNA.
- 高解像度 (5.5アングストーム) クリオ電子顕微鏡.
- 比較構造分析 mRNA と mRNA の有無,および構造化されていない mRNA による.
主要な成果:
- mRNA経路と30Sリボソームサブユニットのトランスレーションオペレータの幹ループの正確な位置を決定した.
- イニシエーターtRNAとオペレータ結合は,イニシエーション複合体の特徴である空のtRNA出口部位を持つリボソームで観察されました.
- オペレーターの規制領域は,抑制器媒介翻訳阻害を可能にするように配置されています.
結論:
- この研究は,抑制器媒介による翻訳制御のための分子メカニズムを提供します.
- これは,リボソーム上の特定のmRNAの位置づけが,規制機能に与える重要性を強調している.
- この発見は,mRNA制御要素がリボソーム内でどのように機能するかについての一般的なモデルを示唆しています.
さらに関連する動画
11:49A Novel Saturation Mutagenesis Approach: Single Step Characterization of Regulatory Protein Binding Sites in RNA Using Phosphorothioates
Published on: August 21, 2018
09:45An Oligonucleotide-based Tandem RNA Isolation Procedure to Recover Eukaryotic mRNA-Protein Complexes
Published on: August 18, 2018
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...
Nuclear Export of mRNA
Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
Nonsense-mediated mRNA Decay
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Types of 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 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...
Nuclear Export of mRNA
Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
Nonsense-mediated mRNA Decay
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
