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Intraluminal vesicles (ILVs) are small vesicles 50-80 nm in diameter formed during the maturation of early endosomes. A specialized endosome containing numerous ILVs is called a multivesicular body (MVB). ILVs contain internalized molecules such as antigens, nucleic acids, proteins, and metabolites. Some of these molecules are released from the MVBs inside exosomes and are transported to other cells. Other MVBs contain molecules that are retained in the ILVs and are later degraded within the...
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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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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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Assembly of the Lipid Bilayer in the ER01:28

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Biological membranes are more than just a barrier separating cell cytoplasm from the outside environment. They are highly dynamic and help maintain the integrity and physiological stability of the cells as well as membrane-bound organelles. Membranes also play vital roles in cell-to-cell and intracellular communication.
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Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
Flippase
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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
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Membrane scission by the ESCRT-III complex.

Thomas Wollert1, Christian Wunder, Jennifer Lippincott-Schwartz

  • 1Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, US Department of Health and Human Services, Bethesda, Maryland 20892, USA.

Nature
|February 24, 2009
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Summary
This summary is machine-generated.

The endosomal sorting complex required for transport (ESCRT)-III proteins Vps20, Snf7, and Vps24 can detach vesicles. Vps4 ATPase activity is crucial for ESCRT-III recycling and multiple budding cycles.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The endosomal sorting complex required for transport (ESCRT) machinery is vital for cellular processes like multivesicular body formation, viral budding, and cytokinesis.
  • ESCRT-III, a core component, comprises proteins that assemble into filaments to drive membrane remodeling events.

Purpose of the Study:

  • To reconstitute and visualize the budding and scission of intralumenal vesicles mediated by ESCRT-III.
  • To determine the minimal protein requirements for ESCRT-III function in vesicle detachment and recycling.

Main Methods:

  • Reconstitution of ESCRT-III-dependent intralumenal vesicle budding and scission using giant unilamellar vesicles.
  • Visualization of the process using fluorescence microscopy.

Main Results:

  • Three ESCRT-III subunits (Vps20, Snf7, Vps24) were sufficient for intralumenal vesicle detachment.
  • Vps2 and the ATPase activity of Vps4 were essential for ESCRT-III recycling and multiple rounds of vesicle budding.
  • The minimal functional ESCRT-III and Vps4 complex represents an ancient conserved set of proteins.

Conclusions:

  • The study identifies the minimal ESCRT-III components necessary for vesicle scission.
  • Vps4-mediated ATPase activity is critical for the dynamic cycling of ESCRT-III, enabling sustained membrane remodeling.
  • These findings shed light on the evolutionary conservation of the ESCRT system.