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Intralumenal Vesicles and Multivesicular Bodies01:38

Intralumenal Vesicles and Multivesicular Bodies

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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The endoplasmic reticulum or ER makes up for more than half of the membranes in a cell and accounts for 10% of total cell volume. It is also the primary protein and lipid synthesis factory for most cell organelles, such as the Golgi apparatus, lysosomes, secretory vesicles, and the plasma membrane. Despite being the most extensive and functionally complex subcellular organelle, ER was the last to be discovered. After years of deliberation, Keith Porter and George Palade in the year 1954,...
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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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Endoplasmic ReticulumThe endoplasmic reticulum (ER) is an extensive network of membranous sacs and tubules in eukaryotic cells, continuous with the outer membrane of the nucleus. This structural continuity integrates nuclear and cytoplasmic processes and facilitates efficient intracellular transport. This allows mRNA to move directly from the nucleus to ribosomes for efficient protein synthesis. As a result, the ER serves as a central site for the synthesis, processing, and distribution of...
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Protein Translocation Machinery on the ER Membrane

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Sec61 protein conducting channel
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Structure and function of ESCRT-III.

Suman Lata1, Guy Schoehn, Julianna Solomons

  • 1Unit for Virus Host Cell Interaction, UMR 5233 UJF-EMBL-CNRS, 6 rue Jules Horowitz 38042 Grenoble Cedex 9, France.

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The endosomal sorting complex required for transport III (ESCRT-III) machinery is crucial for cellular processes like vesicle formation and cell division. This study reviews ESCRT-III structures, functions, and its role in membrane abscission.

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Expression and Purification of the Human Lipid-sensitive Cation Channel TRPC3 for Structural Determination by Single-particle Cryo-electron Microscopy
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16:43

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Published on: February 18, 2014

Area of Science:

  • Cell Biology
  • Molecular Biology

Background:

  • The endosomal sorting complex required for transport III (ESCRT-III) pathway is essential for multivesicular body formation, viral budding, and cytokinesis.
  • Human ESCRT-III comprises 11 proteins, largely conserved with yeast homologs, playing key roles in membrane remodeling.

Purpose of the Study:

  • To review the current understanding of ESCRT-III structures and functions.
  • To discuss the activation, regulation, and role of ESCRT-III in membrane abscission.

Main Methods:

  • In vitro assembly of charged multivesicular body protein (CHMP) 2A and CHMP3 into helical polymers.
  • Analysis of vacuolar protein sorting (VPS) 4-mediated disassembly of ESCRT-III polymers.

Main Results:

  • CHMP2A and CHMP3 form helical tubular structures, serving as platforms for membrane interaction.
  • VPS4 catalyzes the disassembly of ESCRT-III CHMP2A-CHMP3 polymers.

Conclusions:

  • ESCRT-III's structural organization and dynamic polymer disassembly are critical for membrane abscission.
  • Further research into ESCRT-III regulation and function in various cellular contexts is warranted.