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Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

2.6K
The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
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The Proteasome01:13

The Proteasome

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Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
1.6K
The Proteasome02:18

The Proteasome

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Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
10.0K
The Proteasome02:18

The Proteasome

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4.4K
Infection01:20

Infection

11.8K
When a pathogen enters the body and reproduces, it can cause an infection, damage body cells, and cause illness symptoms that eventually lead to disease. Therefore, its prevention requires breaking the chain of infection.
The chain begins with pathogens: bacteria, viruses, fungi, prions, or parasites such as protozoa helminths. These can be present on the skin as transient or resident flora, or they can be acquired from the environment. Identifying and treating the type of infection and...
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Stringent Response in E. coli01:23

Stringent Response in E. coli

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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...
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Updated: Jan 12, 2026

Quantifying Tissue-Specific Proteostatic Decline in Caenorhabditis elegans
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Quantifying Tissue-Specific Proteostatic Decline in Caenorhabditis elegans

Published on: September 7, 2021

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病原体如何在感染期间维持蛋白质稳定?

Carissa Chan1, Eduardo A Groisman1

  • 1Department of Microbial Pathogenesis, Yale School of Medicine, New Haven, Connecticut, USA.

Molecular microbiology
|November 4, 2025
PubMed
概括
此摘要是机器生成的。

细菌Hsp70伴侣DnaK与核糖体结合,并在饥饿期间减缓蛋白质合成,这是感染期间的关键压力. 这种伴侣活动与其在蛋白质折叠中的作用不同,并且在各个生物体中各不相同.

关键词:
这就是DnaK的意思.在Hsp70中,它是Hsp70的.在J-域的cochaperone中.在PhoPPP的PhoP在RpoH中使用RpoH.的含量是多少? 的含量是多少?蛋白质折叠 蛋白质的折叠蛋白质合成 蛋白质合成这是一个触发因素.

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Using a Bacterial Pathogen to Probe for Cellular and Organismic-level Host Responses
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Using a Bacterial Pathogen to Probe for Cellular and Organismic-level Host Responses

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Using Caenorhabditis elegans as a Model System to Study Protein Homeostasis in a Multicellular Organism
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Using Caenorhabditis elegans as a Model System to Study Protein Homeostasis in a Multicellular Organism

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相关实验视频

Last Updated: Jan 12, 2026

Quantifying Tissue-Specific Proteostatic Decline in Caenorhabditis elegans
09:18

Quantifying Tissue-Specific Proteostatic Decline in Caenorhabditis elegans

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Using a Bacterial Pathogen to Probe for Cellular and Organismic-level Host Responses
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Using Caenorhabditis elegans as a Model System to Study Protein Homeostasis in a Multicellular Organism
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Using Caenorhabditis elegans as a Model System to Study Protein Homeostasis in a Multicellular Organism

Published on: December 18, 2013

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科学领域:

  • 微生物学 微生物学
  • 分子生物学分子生物学
  • 细胞生物学 细胞生物学

背景情况:

  • 分子陪伴者对于通过协助蛋白质折叠来维持蛋白质静止至关重要.
  • 细胞调节蛋白质合成和折叠能力,以防止有毒聚合物的形成.
  • 细胞质Mg2+饥饿是一种影响细菌蛋白质稳定性的感染相关压力.

研究的目的:

  • 为了研究Hsp70伴侣DnaK在Mg2+饥饿期间调节蛋白质合成中的作用. 在*Salmonella enterica* Typhimurium血清中.
  • 了解DnaK在压力下的功能如何与其正规角色以及其他伴侣 (如触发因子) 不同.
  • 探索差异性伴侣表达在细菌病原发生的含义.

主要方法:

  • 在Mg2+缺乏条件下研究了S. typhimurium*中的DnaK与核糖体的相互作用.
  • 评估了DnaK结合对蛋白质合成率的影响.
  • 在PhoP调节的感染相关条件下分析了DnaK,cochaperones (J域蛋白,GrpE) 和触发因子的表达模式.

主要成果:

  • 在S. typhimurium*中,DnaK与核糖体结合,并在Mg2+饥饿期间降低蛋白质合成.
  • 这种对蛋白质合成的抑制作用是独立于J域的cochaperones和GrpE的.
  • 病毒性调节器PhoP在感染相关的压力过程中可调节DnaK,但不能调节其他陪伴者/辅助者.
  • 在细菌 (抑制) 和真核生物 (促进) 之间,核糖体中的Hsp70伴侣活性不同,并且根据生长条件而有所变化.

结论:

  • 在Mg2+饥饿期间,DnaK在调节蛋白质合成方面发挥着独特的作用,与其折叠功能分开.
  • 由PhoP指挥的陪伴者和辅助者的差异表达,有助于*S. typhimurium*的发病.
  • 核糖体中的Hsp70伴侣活性取决于上下文,根据细胞条件和生物体类型而异,突出显示功能分歧.