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Related Concept Videos

Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

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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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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.
Another mechanism for membrane domain formation involves membrane proteins interacting with...
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Membrane Domains01:18

Membrane Domains

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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.
Protein Domains
The membrane comprises a group of distinct proteins responsible for carrying out a cell's specific function. For example, the plasma membrane of the human sperm, or a single germ cell, contains a unique set of proteins in the...
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Protein-protein Interfaces02:04

Protein-protein Interfaces

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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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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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Protein Translocation Machinery on the ER Membrane01:28

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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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Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy
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Method to Visualize and Analyze Membrane Interacting Proteins by Transmission Electron Microscopy

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Size-dependent protein segregation at membrane interfaces.

Eva M Schmid1, Matthew H Bakalar2, Kaushik Choudhuri3

  • 1Department of Bioengineering, University of California, Berkeley, CA.

Nature Physics
|December 17, 2016
PubMed
Summary
This summary is machine-generated.

Protein size differences passively segregate molecules at membrane interfaces. Even small size variations, like a ~5 nm increase, can exclude proteins, impacting cell signaling and organelle interactions.

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Related Experiment Videos

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Area of Science:

  • Biophysics
  • Cell Biology
  • Biochemistry

Background:

  • Cell-cell junctions exhibit specific protein organization patterns, e.g., E-cadherin enrichment and CD45 exclusion.
  • Understanding protein organization mechanisms is crucial for cell signaling and intracellular transport.

Purpose of the Study:

  • To investigate the role of protein size in membrane protein organization at interfaces.
  • To determine if passive mechanisms, independent of the cytoskeleton, can drive protein segregation.

Main Methods:

  • Reconstitution of membrane interfaces using giant unilamellar vesicles (GUVs).
  • Decoration of GUVs with synthetic binding and non-binding proteins of varying sizes.
  • In vitro measurements combined with Monte Carlo simulations.

Main Results:

  • Protein size differences significantly alter organization at reconstituted membrane interfaces.
  • A ~5 nm increase in non-binding protein size can lead to its exclusion from the interface.
  • Exclusion is influenced by lateral crowding, binding affinity, and membrane fluctuations.

Conclusions:

  • Passive protein size differences are a potent mechanism for segregating proteins at membrane interfaces.
  • This mechanism has implications for understanding signaling at cell-cell junctions and protein sorting in organelles.