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相关概念视频

Gene Regulation in Microbial Communities: Quorum Sensing01:28

Gene Regulation in Microbial Communities: Quorum Sensing

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Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
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Bacterial Signaling01:30

Bacterial Signaling

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Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...
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Gram-negative Bacterial Protein Secretion Systems01:17

Gram-negative Bacterial Protein Secretion Systems

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Gram-negative bacteria utilize sophisticated protein secretion systems to transport proteins across their double-membrane envelope into the extracellular environment or host cells. Based on their mechanism of action, these systems are classified into one-step and two-step pathways.One-Step Secretion Systems (Types I, III, IV, and VI)One-step secretion systems bypass the periplasm entirely, forming a continuous channel that spans both the inner and outer membranes:Type I Secretion System (T1SS):...
55
Mechanism of Conjugation01:19

Mechanism of Conjugation

46
Bacterial conjugation is a mechanism of horizontal gene transfer that enables the exchange of genetic material between bacterial cells through direct contact. This process is facilitated by a donor cell carrying a conjugative plasmid, which encodes genes necessary for pilus formation, DNA replication, and transfer. The conjugative plasmid plays a central role in initiating and executing the transfer of genetic material.The tra region of the conjugative plasmid encodes proteins responsible for...
46
Other Stress Responses in Bacteria01:30

Other Stress Responses in Bacteria

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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...
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Pinching-off of Coated Vesicles01:32

Pinching-off of Coated Vesicles

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Vesicle budding is orchestrated by distinct cytosolic proteins such as adaptor proteins, coat proteins, and GTPases. To initiate vesicle budding, membrane-bending proteins containing crescent-shaped BAR domains bind to the lipid heads in the bilayer and distort the membrane to form a protein-coated vesicle bud. Adaptors proteins such as AP2 for clathrin-coated vesicles can nucleate on the deformed membrane. Finally, coat proteins such as clathrin or COPI and COPII assemble into a coat forming...
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相关实验视频

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Applying Fluorescence Resonance Energy Transfer FRET to Examine Effector Translocation Efficiency by Coxiella burnetii during siRNA Silencing
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通过IVA型分泌系统效应器进行定数火.

Jinxing Liao1, Zihan Li1, Dan Xiong1

  • 1College of Plant Protection, Laboratory of Plant Immunity, Key Laboratory of Integrated Management of Crop Diseases and Pests, Nanjing Agricultural University, Nanjing, China.

The ISME journal
|June 20, 2023
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概括

一种新的细菌机制使用效应器转位来阻止乙同素乳 (AHL) 的产生,从而赋予了竞争优势. 这一发现提供了新的策略,通过扰乱定数感应来控制细菌感染.

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Anti-virulent Disruption of Pathogenic Biofilms using Engineered Quorum-quenching Lactonases
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科学领域:

  • 微生物学 微生物学
  • 细菌的传播 细菌的传播
  • 分子生物学分子生物学

背景情况:

  • 蛋白质细菌使用乙同素乳 (AHLs) 进行定数感知,这对于病原体感染至关重要.
  • 酶性AHL降解是一种已知的定数灭策略.
  • 细菌物种间的竞争涉及复杂的通信和防御机制.

研究的目的:

  • 为了识别超越酶降解的新型定数灭机制.
  • 研究IVA型分泌系统 (T4ASS) 效应器在物种间交流中的作用.
  • 探索一种新型效应因子LqqE1在阻断AHL合成方面的潜力.

主要方法:

  • 鉴定了一种来自Lysobacter酶原OH11.11的T4ASS作用因子 (Le1288).
  • 转移了Le1288的位置,变成了Pseudomonas fluorescens 2P24.
  • 研究了Le1288和AHL合成酶PcoI之间的相互作用.
  • 评估了这种新的"限制人数"机制对生态的影响.

主要成果:

  • 称为LqqE1的Le1288通过与AHL合成酶PcoI结合来抑制AHL的产生.
  • LqqE1阻断了PcoI对S-adenosy-L-methionine的识别,这是AHL合成的关键基质.
  • 这种以效应器为媒介的决数灭为L. enzymogenes OH11.11提供了竞争优势.
  • 该机制在其他产生T4ASS的细菌中被观察到,并且具有潜在的应用.

结论:

  • 发现了一种涉及T4ASS效应器转移的新型定数灭机制.
  • LqqE1代表了一种抑制AHL合成的新类定数灭分子.
  • 这一发现突显了效应器介导的物种间沟通的生态意义.
  • 在控制人类和植物病原体中,LqqE1具有潜在的应用,例如Pseudomonas aeruginosa和Ralstonia solanacearum.