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Related Concept Videos

Intralumenal Vesicles and Multivesicular Bodies01:38

Intralumenal Vesicles and Multivesicular Bodies

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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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Essential proteins such as insulin or low-density lipoprotein (LDL) and micronutrients such as iron enter a eukaryotic cell through receptor-mediated endocytosis. Subsequently, the early endosomes fuse with the vesicles containing such receptor-ligand complexes and play a vital role in sorting the incoming ligands and receptors. While the ligands are either degraded inside the vesicle or released into the cytosol, their receptors are returned to the plasma membrane for further rounds of...
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Overview of Protein Sorting and Transport01:45

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Eukaryotic cells have different membrane-bound organelles with distinct protein requirements. The process by which proteins are targeted to a specific organelle is called protein sorting.
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The early endosome containing internalized molecules matures through transformations in its location, morphology, intraluminal pH, and membrane protein composition. Together, these changes result in a more acidic late endosome that contains multiple intraluminal vesicles; therefore, the late endosome is also called a multivesicular body (MVB).
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The ER, Golgi apparatus, endosomes, and lysosomes work in tandem to modify, sort, and package proteins and lipids. An integrated membrane trafficking network facilitates the back and forth shuttling of molecules within different organelles in the same cell or across the cell membrane.
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Related Experiment Videos

Lipid sorting and multivesicular endosome biogenesis.

Christin Bissig1, Jean Gruenberg

  • 1Biochemistry Department, University of Geneva, 1211 Geneva 4, Switzerland.

Cold Spring Harbor Perspectives in Biology
|October 3, 2013
PubMed
Summary
This summary is machine-generated.

Lipids segregate within endosomes through various mechanisms, influencing organelle function and membrane dynamics. This review explores lipid sorting in endosomal membranes and its functional impact.

Related Experiment Videos

Area of Science:

  • Cell Biology
  • Membrane Biology
  • Biochemistry

Background:

  • Intracellular organelles like endosomes possess distinct protein and lipid compositions.
  • Mechanisms for lipid segregation operate at multiple levels, including biophysical properties, molecular interactions, and metabolic enzyme activity.

Purpose of the Study:

  • To review the mechanisms of lipid sorting within endosomal membranes.
  • To discuss the impact of lipids on endosome functions, including membrane properties and protein dynamics.

Main Methods:

  • Literature review of studies on organelle lipid composition.
  • Analysis of research on lipid-protein interactions and membrane biophysics.
  • Synthesis of findings on lipid metabolism and enzyme distribution.

Main Results:

  • Lipid segregation in endosomes is achieved through diverse strategies.
  • Lipids modulate endosomal membrane biophysical parameters.
  • Lipids recruit effector proteins crucial for protein sorting and membrane dynamics.

Conclusions:

  • Lipid sorting is fundamental to endosome identity and function.
  • Understanding lipid dynamics is key to deciphering endosome-mediated cellular processes.
  • Lipids play a critical role in regulating membrane organization and trafficking.