Related Experiment Video
Updated: Aug 13, 2026
12:15
In Vitro Polymerization of F-actin on Early Endosomes
Published on: August 28, 2017
The Lipids of the Early Endosomes: Making Multimodality Work
Senthil Arumugam1, Amandeep Kaur1
1European Molecular Biology Laboratory Australia Node for Single Molecule Science and ARC Centre of Excellence in Advanced Molecular Imaging, School of Medical Sciences, University of New South Wales, Sydney, 2052, New South Wales, Australia.
Chembiochem : a European Journal of Chemical Biology
|April 5, 2017
Summary
Early endosomes utilize distinct lipid chemistries, including cholesterol, phosphoinositides, and phosphatidylserine, to regulate their functions. These lipids enable specific mechanisms essential for endosome activity and cargo processing.
Area of Science:
- Cell Biology
- Biochemistry
- Biophysics
Background:
- Early endosomes are crucial for intracellular trafficking, receiving cargo from the plasma membrane.
- Endosomal membrane organization is less understood than the plasma membrane, despite lipids' critical roles.
- Lipid composition dictates membrane properties and cellular functions.
Purpose of the Study:
- To explore the biochemical and biophysical phenomena governing early endosomal membranes.
- To highlight the roles of specific lipids in early endosome function.
- To elucidate the multimodal nature of early endosomes through lipid-specific mechanisms.
Main Methods:
- Literature review and synthesis of existing research on endosomal lipids.
- Analysis of biochemical and biophysical data related to membrane bilayers.
- Focus on key lipids: cholesterol, phosphoinositides, and phosphatidylserine.
Main Results:
- Early endosomes employ unique lipid compositions distinct from the plasma membrane.
- Cholesterol, phosphoinositides, and phosphatidylserine play significant roles in endosome functions.
- Lipid-protein interactions and membrane properties are central to endosome mechanisms.
Conclusions:
- Early endosomes are sophisticated organelles with specialized lipid chemistries.
- Distinct lipid-specific mechanisms underpin the functional diversity of early endosomes.
- Understanding these lipid dynamics is key to comprehending endocytic pathways.
Related Concept Videos
01:38Receptor-mediated Endocytosis
Overview
01:20Receptor-mediated Endocytosis
Receptor-mediated endocytosis is when bulk amounts of specific molecules are imported into a cell after binding to cell surface receptors. The molecules bound to these receptors are taken into the cell through inward folding of the cell surface membrane, which is eventually pinched off into a vesicle within the cell. Structural proteins, such as clathrin, coat the budding vesicle.
Clathrin-Mediated Endocytosis of LDL
One well-characterized example of receptor-mediated endocytosis is the...
Clathrin-Mediated Endocytosis of LDL
One well-characterized example of receptor-mediated endocytosis is the...
01:28The Early Endosome: Endocytosis of Transferrin
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...
01:28Maturation of Endosomes
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).
Changes in location
The maturing endosome moves along microtubules from the periphery of the cell towards the perinuclear region. This movement of the...
Changes in location
The maturing endosome moves along microtubules from the periphery of the cell towards the perinuclear region. This movement of the...
01:38Intralumenal 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...
01:44Introduction to Membrane Traffic
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.
The transport of soluble and membrane proteins is mediated by transport vesicles that collect cargo from one cellular compartment and deliver it to another by fusing with the target organelle membrane. The Rab...
The transport of soluble and membrane proteins is mediated by transport vesicles that collect cargo from one cellular compartment and deliver it to another by fusing with the target organelle membrane. The Rab...