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Related Concept Videos

Eukaryotic Compartmentalization01:37

Eukaryotic Compartmentalization

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One of the distinguishing features of eukaryotic cells is that they contain membrane-bound organelles, such as the nucleus and mitochondria, that carry out specialized functions. Since biological membranes are only selectively permeable to solutes, they help create a compartment with controlled conditions inside an organelle. These microenvironments are tailored to the organelle's specific functions and help isolate them from the surrounding cytosol.
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Eukaryotic Compartmentalizations01:46

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One of the distinguishing features of eukaryotic cells is that they contain membrane-bound organelles, such as the nucleus and mitochondria, that carry out specialized functions. Since biological membranes are only selectively permeable to solutes, they help create a compartment with controlled conditions inside an organelle. These microenvironments are tailored to the organelle's specific functions and help isolate them from the surrounding cytosol.
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Membrane Domains01:18

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The membrane domains concentrate specific lipids and proteins at one place within the membrane, which helps in cell signaling, adhesion, and other critical cellular processes. These domains can differ in size, composition, function, and lifespan.
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Mechanisms of Membrane Domain Formation00:59

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Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Updated: Dec 1, 2025

Fluorescent Leakage Assay to Investigate Membrane Destabilization by Cell-Penetrating Peptide
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Client proximity enhancement inside cellular membrane-less compartments governed by client-compartment interactions.

Daesun Song1, Yongsang Jo1, Jeong-Mo Choi2,3

  • 1Department of Chemistry, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea.

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Membrane-less organelles enhance protein interactions within cells. This study reveals that recruited proteins show significantly increased proximity inside these compartments, driven by concentration and scaffold networks.

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Area of Science:

  • Cell Biology
  • Biophysics

Background:

  • Membrane-less organelles are crucial for cellular processes, acting as dynamic reaction centers.
  • Liquid-liquid phase separation explains their formation, but internal biomolecular behaviors remain unclear.

Purpose of the Study:

  • To quantitatively measure changes in protein interactions within membrane-less compartments in living cells.
  • To elucidate the mechanisms behind enhanced protein proximity inside these compartments.

Main Methods:

  • Quantitative measurements of protein interactions in living cells.
  • In vitro phase separation models were used to analyze client protein proximity.

Main Results:

  • Protein interaction signals significantly increased inside membrane-less compartments under various conditions.
  • Client protein proximity within compartments was over 16 times higher than expected based on concentration alone.

Conclusions:

  • Phase separation compartmentalization greatly enhances client protein proximity.
  • This enhancement is due to selective recruitment and localization around scaffold protein networks within compartments.