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Tail-anchored, or TA, proteins are estimated to make up to 3-5% of membrane proteins found in the eukaryotic cell. Such proteins have a single transmembrane domain located approximately 30 amino acid residues upstream from the C-terminal end. As a result, the signal recognition particle (SRP) cannot guide a TA protein to the ER membrane for cotranslational insertion. Hence, they are integrated into the ER membrane post-translationally using their C-terminal end as the anchor. TA proteins...
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Exosomes are stable, lipid bilayer-enclosed vesicles capable of crossing biological barriers. They can carry a wide range of molecules required for intercellular communication. Once exosomes are released from the cell where they originated, they enter a recipient cell through various pathways such as fusion, receptor-mediated endocytosis, macropinocytosis, and phagocytosis.
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Once a transport vesicle has recognized its target organelle, the vesicular membrane needs to fuse with the target membrane to unload the cargo. Transmembrane proteins called SNAREs present on organelle membranes and their vesicles, mediate vesicle fusion.
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After budding out from the ER membrane, some COPII vesicles lose their coat and fuse with one another to form larger vesicles and interconnected tubules called vesicular tubular clusters or VTCs. These clusters constitute a compartment at the ER-Golgi interface known as ERGIC (Endoplasmic Reticulum Golgi Intermediate Compartment). The ERGIC is a mobile membrane-bound cargo transport system that sorts proteins secreted from ER and delivers them to the Golgi.
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Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
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Purification and Analysis of Caenorhabditis elegans Extracellular Vesicles
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Tetherin is an exosomal tether.

James R Edgar1, Paul T Manna1, Shinichi Nishimura2,3

  • 1University of Cambridge, Cambridge Institute for Medical Research, Cambridge, United Kingdom.

Elife
|September 23, 2016
PubMed
Summary
This summary is machine-generated.

Inactivating vacuolar ATPase increases exosome production. Tetherin protein regulates exosome release, influencing their cell surface association versus release into the medium, impacting intercellular communication.

Keywords:
V-ATPasecell biologyexosomeshumantetherin

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Area of Science:

  • Cell Biology
  • Extracellular Vesicles
  • Molecular Biology

Background:

  • Exosomes are extracellular vesicles involved in intercellular communication, antigen presentation, and disease progression.
  • Their biogenesis involves endosomal fusion with the plasma membrane.

Purpose of the Study:

  • To investigate the role of vacuolar ATPase and tetherin in exosome production and release.
  • To understand the mechanisms controlling exosome fate and localization.

Main Methods:

  • Inactivation of vacuolar ATPase in HeLa cells.
  • Knockout and rescue experiments involving tetherin.
  • Analysis of exosome association with the plasma membrane and release into the medium.

Main Results:

  • Inactivating vacuolar ATPase significantly increased exosome production.
  • Tetherin knockout reduced plasma membrane-associated exosomes by 4-fold, increasing release into the medium.
  • Wild-type tetherin rescued the phenotype, but a GPI anchor-deficient mutant did not.

Conclusions:

  • Vacuolar ATPase activity influences exosome biogenesis.
  • Tetherin plays a critical role in tethering exosomes to the cell surface, modulating their release and potential for intercellular signaling.