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相关概念视频

Gram-negative Bacterial Protein Secretion Systems01:17

Gram-negative Bacterial Protein Secretion Systems

42
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):...
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Protein Translocation Machinery on the ER Membrane01:28

Protein Translocation Machinery on the ER Membrane

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The translocon complex situated on the ER membrane is the main gateway for the protein secretory pathway. It facilitates the transport of nascent peptides into the ER lumen and their insertion into the ER membrane.
Sec61 protein conducting channel
In eukaryotes, the translocon complex comprises a core heterotrimeric translocator channel called the Sec61 complex. This channel includes three transmembrane proteins, Sec61α, Sec61β, and Sec61γ, and is the largest subunit of the...
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Bacterial Translocation and Protein Secretion01:26

Bacterial Translocation and Protein Secretion

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Bacterial protein secretion involves translocation systems to ensure proteins reach their designated locations, including the plasma membrane, periplasm, outer membrane, or the external environment. These translocation systems are vital for bacterial physiology, supporting processes like membrane assembly, enzymatic activity in the periplasm, and interactions with the external environment. The division of labor between Sec and Tat pathways ensures efficiency in handling proteins with diverse...
36
Protein Complex Assembly02:41

Protein Complex Assembly

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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
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Mechanism of Conjugation01:19

Mechanism of Conjugation

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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...
36
Clathrin Coated Vesicles01:12

Clathrin Coated Vesicles

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Clathrin-coated vesicles use endocytosis to transport receptors and lysosomal hydrolases from the Golgi to the lysosome in the late secretory pathway. Clathrin-mediated endocytosis was the first described endocytic process, and Clathrin-coated vesicles remain one of the most well-studied transport vesicles. The molecular machinery that generates clathrin-coated vesicles comprises over 50 proteins that precisely coordinate vesicle formation. Cell surface receptors concentrated in indented sites...
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相关实验视频

Updated: Jul 15, 2025

A Visual Assay to Monitor T6SS-mediated Bacterial Competition
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A Visual Assay to Monitor T6SS-mediated Bacterial Competition

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乙杆菌VI型分泌系统包括一个非正规的膜复合体.

Ona Kandolo1, Yassine Cherrak1, Isaac Filella-Merce2,3

  • 1Laboratoire d'Ingénierie des Systèmes Macromoléculaires (LISM), Institut de Microbiologie, Bioénergies and Biotechnologie (IM2B), Aix-Marseille Université, Centre National de la Recherche Scientifique (CNRS)-UMR 7255, Marseille, France.

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概括

这种细菌是Acinetobacter baumannii.

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Conjugative Mating Assays for Sequence-specific Analysis of Transfer Proteins Involved in Bacterial Conjugation
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Monitoring the Assembly of a Secreted Bacterial Virulence Factor Using Site-specific Crosslinking
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相关实验视频

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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
  • 细菌病原体的产生

背景情况:

  • 宝曼尼菌 (Acinetobacter baumannii) 是一种重要的机会性病原体,以其快速获得耐药性而闻名.
  • 在Acinetobacter中,VI型分泌系统 (T6SS) 在机动性和细菌间竞争中起作用.
  • 虽然研究了T6SS调节,但它的组装和架构,特别是膜复合体 (MC),仍然不太了解.

研究的目的:

  • 描述 A. baumannii T6SS 膜复合体 (MC) 的特征,并了解它如何在没有 TssJ 脂蛋白的情况下组装.
  • 为了确定参与A. baumannii MC生物发生的特定蛋白质.
  • 阐明A. baumannii用来弥补TssJ缺失的机制.

主要方法:

  • 蛋白质组学分析以确定MC的组成.
  • 生物化学试验用于研究蛋白质相互作用和局部化.
  • 显微镜技术可视化MC组装动态.

主要成果:

  • A. baumannii MC由五种蛋白质组成,利用了三种特定于Acinetobacter的包膜蛋白.
  • 缺少TssJ是由TsmK蛋白补偿的,该蛋白稳定了MC.
  • 在TssM中,一种新的域促进了同类寡合化,这对于T6SS通道形成至关重要.

结论:

  • A. baumannii已经发展出一种独特的T6SS MC组装机制.
  • 特定物种的蛋白质 (TsmK和TssM) 在MC生物发生和TssJ功能替代中起着至关重要的作用.
  • 这些发现为细菌T6SSs的进化多样性和组装提供了洞察力.