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関連する概念動画

Regulation of Bacterial Virulence01:28

Regulation of Bacterial Virulence

Pathogenic bacteria employ a range of regulatory mechanisms to modulate the expression of virulence genes in response to environmental and host-derived signals. These mechanisms ensure that virulence factors are expressed only under favorable conditions, thereby optimizing infection and survival strategies.Mechanisms of Virulence RegulationKey regulatory strategies include:Two-Component Systems: These consist of a membrane-bound sensor kinase and a cytoplasmic response regulator. Environmental...
Other Stress Responses in Bacteria01:30

Other Stress Responses in Bacteria

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...
Stringent Response in E. coli01:23

Stringent Response in E. coli

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...
Rab Cascades01:25

Rab Cascades

Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.
The JAK-STAT Signaling Pathway01:20

The JAK-STAT Signaling Pathway

Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as  SH2...

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関連する実験動画

Updated: May 16, 2026

High-throughput Assay to Phenotype Salmonella enterica Typhimurium Association, Invasion, and Replication in Macrophages
11:10

High-throughput Assay to Phenotype Salmonella enterica Typhimurium Association, Invasion, and Replication in Macrophages

Published on: August 11, 2014

Rab32に依存する経路は,サルモネラ型菌の宿主制限に寄与する.

Stefania Spanò1, Jorge E Galán

  • 1Department of Microbial Pathogenesis, Yale University School of Medicine, 295 Congress Avenue, New Haven, CT 06536, USA.

Science (New York, N.Y.)
|November 20, 2012
PubMed
まとめ

サルモネラ・タイフィー型

科学分野:

  • 微生物学 微生物学とは
  • 病原体の宿主特異性について
  • バクテリア病原菌の発生

背景:

  • サルモネラ・タイフィは,厳格な宿主特異性を持つヒト病原体です.
  • この宿主制限の背後にある分子機構は十分に理解されていません.

研究 の 目的:

  • サルモネラ・タイファイの宿主特異性の分子基礎を調査する.
  • 許容しない宿主における生存を可能にする細菌の要因を特定する.

主な方法:

  • サルモネラ・タイフィミュリウム型IIIの分泌システムエフェクタータンパク質の役割を調査した.
  • 宿主因子Rab32とBLOCの成分を枯渇させるためにRNA干渉を利用した.
  • マウスのマクロファージと組織におけるサーモネラ・タイフィの生存率を調べた.

主要な成果:

  • サルモネラ・タイフィムリウムからの単一のタイプIII分泌システムエフェクターにより,サルモネラ・タイフィーがマウスで生き残り,複製することが可能になりました.
  • このエフェクターは,ライソソームに関連した臓器細胞の移動に関与するタンパク質であるRab32を標的とする.
  • Rab32またはBLOCの成分が枯渇すると,マウスのマクロファージでサルモネラ・タイフィの生存が可能になった.

さらに関連する動画

Identification of Host Pathways Targeted by Bacterial Effector Proteins using Yeast Toxicity and Suppressor Screens
07:40

Identification of Host Pathways Targeted by Bacterial Effector Proteins using Yeast Toxicity and Suppressor Screens

Published on: October 25, 2019

Quantification of Cytosolic vs. Vacuolar Salmonella in Primary Macrophages by Differential Permeabilization
09:25

Quantification of Cytosolic vs. Vacuolar Salmonella in Primary Macrophages by Differential Permeabilization

Published on: July 28, 2015

関連する実験動画

Last Updated: May 16, 2026

High-throughput Assay to Phenotype Salmonella enterica Typhimurium Association, Invasion, and Replication in Macrophages
11:10

High-throughput Assay to Phenotype Salmonella enterica Typhimurium Association, Invasion, and Replication in Macrophages

Published on: August 11, 2014

Identification of Host Pathways Targeted by Bacterial Effector Proteins using Yeast Toxicity and Suppressor Screens
07:40

Identification of Host Pathways Targeted by Bacterial Effector Proteins using Yeast Toxicity and Suppressor Screens

Published on: October 25, 2019

Quantification of Cytosolic vs. Vacuolar Salmonella in Primary Macrophages by Differential Permeabilization
09:25

Quantification of Cytosolic vs. Vacuolar Salmonella in Primary Macrophages by Differential Permeabilization

Published on: July 28, 2015

結論:

  • サルモネラ・タイフィムリウムエフェクタータンパク質は,サルモネラ・タイフィの宿主特異性を克服することができます.
  • Rab32およびBLOC複合体は,サルモネラ・タイフィ感染を制限する主要な宿主因子です.
  • ホストの細胞機構をターゲットにすることは,細菌の宿主適応のためのメカニズムです.