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関連する概念動画

Stringent Response in E. coli01:23

Stringent Response in E. coli

457
Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
457
Regulation of the Unfolded Protein Response01:31

Regulation of the Unfolded Protein Response

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Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
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Other Stress Responses in Bacteria01:30

Other Stress Responses in Bacteria

500
Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...
500
Translational Regulation01:29

Translational Regulation

766
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,...
766
Global Regulatory Systems01:28

Global Regulatory Systems

845
Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...
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Directing Proteins to the Rough Endoplasmic Reticulum01:34

Directing Proteins to the Rough Endoplasmic Reticulum

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The organelle-specific signaling sequences direct proteins synthesized in the cytosol to their final destination like ER, mitochondria, peroxisomes, etc. Some of the proteins directed to ER are then trafficked via vesicles to other organelles within the cell or the extracellular environment through the Golgi complex. For example, the rough ER synthesizes soluble proteins for transportation to the lysosomes or secretion out of the cell. It can also synthesize transmembrane proteins that can...
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関連する実験動画

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Functional Complementation Analysis FCA: A Laboratory Exercise Designed and Implemented to Supplement the Teaching of Biochemical Pathways
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Functional Complementation Analysis FCA: A Laboratory Exercise Designed and Implemented to Supplement the Teaching of Biochemical Pathways

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厳格なコントロールのリボソーム依存活性化

Alan Brown1, Israel S Fernández1, Yuliya Gordiyenko1

  • 1MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge, CB2 0QH, UK.

Nature
|June 10, 2016
PubMed
まとめ

バクテリアの生存は ストレスを感じ取ることに依存しています 研究者らは構造的にRelA酵素が停滞したリボソームに結合して 厳格な反応を誘発し 重要な生存メカニズムとなり 新しい抗菌薬の標的となる ことを明らかにした.

科学分野:

  • 微生物学
  • 分子生物学
  • 構造生物学

背景:

  • 細菌はストレス反応を通して 環境の変化に適応します
  • 栄養不足によって引き起こされる 厳格な制御は 細菌の代謝と遺伝子発現を 生存のために再プログラムします
  • RelAによって合成されるアラームホルモン (p) ppGppは,この反応の核心です.

研究 の 目的:

  • RelAがバクテリアのリボソームに結合する構造的メカニズムを解明する.
  • RelAがアミノアシレートされたtRNAと未充電をどのように区別するかを理解する.
  • 抗菌薬の開発においてRelAをターゲットにするための構造的基盤を提供すること.

主な方法:

  • 細菌のリボソームに結合するRelAの構造を決定するために,冷凍電子顕微鏡 (cryo-EM) を使用した.
  • 構造的発見を検証するために生化学的測定が暗示された.

主要な成果:

  • 凍結EM構造は,他の転化因子とは異なる,停滞したリボソームのRelAのユニークな結合部位を明らかにします.
  • RelAのマルチドメインアーキテクチャは,歪んだAサイトtRNAと相互作用する.
  • RelAのTGSドメインは,アミノアシレイテッドtRNAの結合をステリックに防止し, (p) ppGpp合成を促進する.

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A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues
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関連する実験動画

Last Updated: Mar 19, 2026

Functional Complementation Analysis FCA: A Laboratory Exercise Designed and Implemented to Supplement the Teaching of Biochemical Pathways
09:27

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Published on: June 24, 2016

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Rapid In Vivo Fixation and Isolation of Translational Complexes from Eukaryotic Cells
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Rapid In Vivo Fixation and Isolation of Translational Complexes from Eukaryotic Cells

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A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues
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A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues

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結論:

  • この構造は,停滞したリボソームによるRelA活性化と,充電されたtRNAに対する差別化を説明する.
  • このメカニズムは ストレス下での細菌の生存に不可欠な 厳格な反応を誘発します
  • RelAは病原菌に対する新しい治療法の開発に有望なターゲットです.