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関連する概念動画

Types of RNA01:23

Types of RNA

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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...
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Bacterial RNA Polymerase00:43

Bacterial RNA Polymerase

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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...
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Nucleic Acid Structure01:25

Nucleic Acid Structure

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The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms  a 5′ to 3′ phosphodiester linkage.
DNA Structure
DNA...
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Nonsense-mediated mRNA Decay02:27

Nonsense-mediated mRNA Decay

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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,...
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Prokaryotic Gene Structure and Organization01:28

Prokaryotic Gene Structure and Organization

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Prokaryotic genomes exhibit a streamlined organization of coding and non-coding regions essential for gene expression and protein synthesis. While coding regions contain the genetic instructions for proteins or functional RNAs, non-coding regions regulate the precise transcription and translation of these genes.Coding Regions: Proteins and RNAsThe primary coding regions, known as structural genes, include sequences transcribed into messenger RNA (mRNA) and ultimately translated into...
182
Translational Regulation01:29

Translational Regulation

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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,...
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人間のmRNAの解読は,細菌と運動的に,構造的に異なる.

Mikael Holm1, S Kundhavai Natchiar1, Emily J Rundlet1,2

  • 1Department of Structural Biology, St Jude Children's Research Hospital, Memphis, TN, USA.

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まとめ

ヒトのリボソームは,異なる運動および構造的メカニズムによって,細菌よりも高いタンパク質合成フィデリティを達成する. ユカリオット延長因子1Aとリボソーム構造要素は,正確なアミノアシル-tRNAの組み込みを調整し,老化と病気に影響を与えます.

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Dual DNA Rulers to Study the Mechanism of Ribosome Translocation with Single-Nucleotide Resolution
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Using SecM Arrest Sequence as a Tool to Isolate Ribosome Bound Polypeptides
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Using SecM Arrest Sequence as a Tool to Isolate Ribosome Bound Polypeptides

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MS2-Affinity Purification Coupled with RNA Sequencing in Gram-Positive Bacteria
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Dual DNA Rulers to Study the Mechanism of Ribosome Translocation with Single-Nucleotide Resolution
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Using SecM Arrest Sequence as a Tool to Isolate Ribosome Bound Polypeptides
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科学分野:

  • 分子生物学
  • 生物化学
  • 構造生物学

背景:

  • リボソームは,アミノアシル-tRNA基板を使用してメッセンジャーRNA (mRNA) を解読することによってタンパク質を合成する.
  • バクテリアのシステムは 主にリボソームの解読に関する現在の理解を伝える.
  • ユーカリオットのリボソームは細菌のリボソームよりも高い解読精度を示し,人間の健康や病気に影響を及ぼします.

研究 の 目的:

  • ヒトのリボソームの忠誠性の 分子基礎を調査する
  • ヒトのリボソームの解読メカニズムと 細菌の解読メカニズムを比較する

主な方法:

  • 単一分子イメージング
  • 冷凍電子顕微鏡 (冷凍EM)

主要な成果:

  • ヒトのリボソームの解読は 細菌の解読とは 運動的・構造的に異なる.
  • 人間のリボソームのアミノアシル-tRNAの移動経路は変化し,著しく遅くなっています.
  • ヒトのリボソームにおけるエウカリオット特有の構造要素とエウカリオット延長因子1A (eEF1A) は,忠誠性にとって極めて重要です.

結論:

  • ヒトのリボソームは 独特の運動と構造の特徴によって より高い解読精度を達成します
  • リボソームとeEF1Aの明確な形状の変化は,真核生物の解読精度を調節する.
  • これらのメカニズムを理解することで 老化に関連した病気や ウイルス感染症や癌の 治療対象となる可能性があります