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Infection01:20

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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.
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Urinary Tract Infection II: Pathophysiology01:25

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The pathophysiology of urinary tract infections (UTIs) encompasses several progressive stages, beginning with bacterial colonization and culminating in potential systemic complications if untreated. UTIs are primarily initiated by bacteria, such as Escherichia coli, which often originate from the gastrointestinal tract and migrate to the urinary system through the periurethral area. This migration can occur via several routes, including improper hygiene practices, sexual activity, or...
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Cystic fibrosis (CF), an autosomal recessive disorder, significantly affects the function of exocrine glands. This genetically inherited disease is characterized by the production of thick and sticky mucus, which can severely affect various organs and systems in the body.
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Stages of infection describe what happens to a susceptible host once a pathogen invades the human body. The stages of infection are incubation, prodromal, illness, stage of decline, and convalescence. The incubation stage is the period from exposure to a pathogen until symptoms start. The infected person is unaware of impending illness as the pathogens grow and multiply within the body. The duration may vary depending on the type of infection. The incubation period of measles averages ten to...
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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.
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基础科学和病原发生学

Bryan D Ryder1, Nicholas L Yan1, Jason E Gestwicki2

  • 1University of California, San Francisco, San Francisco, CA, USA.

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概括
此摘要是机器生成的。

在NLSYYT激活中的位置5的白对于蛋白质酶门的打开和高效的tau降解至关重要. 这种白氨酸的突变显著降低了蛋白酶体活性和tau降解效率.

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科学领域:

  • 生物化学 生物化学
  • 结构生物学 结构生物学
  • 分子生物学分子生物学

背景情况:

  • 一个优化的激活器,NLSYYT,来自人类的19S,在体外有效地降解蛋白,当与古老蛋白酶激活器PA26.2合并时.
  • 结构-活性关系研究表明,氨酸在5位 (P5) 的硬体力是20S蛋白酶体完全打开门和tau降解的关键.

研究的目的:

  • 调查NLSYYT中P5白氨酸对蛋白酶激活和陶降解的作用.
  • 阐明P5突变影响20S蛋白酶门动态和亲和力的结构机制.

主要方法:

  • 使用NLSYYT衍生基与P5.5突变进行了蛋白质体活性测定.
  • 光极化和OpenSPR测量了PA26突变复合物的亲和力和活性.
  • 通过冷电子显微镜 (Cryo-EM) 确定了PA26突变体与20S蛋白质组结合的结构.
  • 在体外和基于细胞的测试追踪了和酸化 (p-tau) 降解.

主要成果:

  • 在P5白氨酸位置的突变显著降低了蛋白质体活性 (40% - 90%),并削弱了对20S蛋白质体的亲和力.
  • 低温EM结构揭示了P5白氨酸与PSMA5的R20的固体相互作用对于质门的开放至关重要.
  • 像P5W或P5Y这样的突变破坏了这种全网络,导致部分门打开,并降低了tau降解效率.

结论:

  • 在NLSYYT中的P5白氨酸对于20S门的稳定性和功能至关重要.
  • 由于P5突变导致20S门的部分开放,阻碍了tau的进入和降解.
  • 这种理解可以指导蛋白质酶激活剂的设计,以针对的降解策略.