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Overview of Secretory Vesicles01:33

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Secretory vesicles, also known as dense core vesicles (DCVs), are membrane-bound vesicles that transport secretory proteins, such as hormones or neurotransmitters. Regulated secretory vesicles transport proteins from the trans-Golgi network to the exterior of the cell. Proteins present in regulated secretory vesicles are required to be rapidly exocytosed in large amounts upon a specific stimulus.
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Integral membrane proteins are proteins adhered to the lipid bilayer of a cell organelle or membrane. They can be of two types: transmembrane integral proteins that span the lipid bilayer and monotopic proteins that are attached to either side of the membrane but do not pass through it.
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Cotranslational Protein Translocation01:20

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Translocation of proteins across membranes is an ancient process that occurs even in bacteria and archaebacteria. In fact, the components of the translocation machinery are still conserved between prokaryotes and eukaryotes.
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Exocytosis00:50

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Exocytosis is a process that releases molecules outside the cell. Like other bulk transport mechanisms, exocytosis requires energy.
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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.
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Progress on the function of Mycobacterium T7SS (ESX) secretion system.

Zhi-Yong Jiang1, Jian-Ping Xie1

  • 1Institute of Modern Biopharmaceuticals, School of Life Sciences, Southwest University, Chongqing 400715, China.

Yi Chuan = Hereditas
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The ESX secretion system in Mycobacterium is crucial for exporting effector proteins that impact host immunity. Understanding its mechanisms offers new avenues for tuberculosis drug and vaccine development.

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Area of Science:

  • Microbiology
  • Immunology
  • Molecular Biology

Background:

  • Mycobacterium infections impair host immunity through secreted effector proteins.
  • The ESX (type VII) secretion system is vital for exporting these proteins in mycobacteria and actinomycetes.
  • The precise secretion mechanisms and functions of the ESX system are not fully understood.

Purpose of the Study:

  • To review the components, functions, and classification of the ESX secretion system.
  • To elucidate the process of substrate transfer via the ESX system.
  • To discuss the implications of the ESX system in antibiotic resistance, bacterial persistence, host-phage interactions, and its potential as a drug target.

Main Methods:

  • Literature review of existing research on the ESX secretion system.
  • Analysis of the structural components and functional roles of the ESX system.
  • Discussion of the biological significance and therapeutic potential of the ESX system.

Main Results:

  • The ESX system is a complex protein export machinery essential for mycobacterial virulence.
  • Substrate transfer to the extracellular environment is mediated by specific ESX components.
  • The ESX system is implicated in key bacterial processes including immune evasion and survival.

Conclusions:

  • The ESX system's role in effector protein secretion is critical for Mycobacterium pathogenesis.
  • Further research into the ESX system can reveal novel strategies for combating tuberculosis.
  • Targeting the ESX system may lead to the development of new anti-tuberculosis drugs and vaccine antigens.