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Related Concept Videos

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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
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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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Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
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Cell division and enlargement are processes that require precise control. The control ensures that cell division cannot proceed unless the cell has grown to a specific size. A spherical, dividing cell requires an approximately 1.6X increase in its surface area to double its volume. The secretory pathway also has a significant role in cell membrane enlargement. Secretory vesicles that bud off from the Golgi apparatus and later fuse with the plasma membrane during exocytosis are a major source of...
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Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
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Reconstitution of Septin Assembly at Membranes to Study Biophysical Properties and Functions
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Membrane reshaping by protein condensates.

Samsuzzoha Mondal1, Tobias Baumgart1

  • 1Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104, United States.

Biochimica Et Biophysica Acta. Biomembranes
|January 15, 2023
PubMed
Summary
This summary is machine-generated.

Protein phase separation drives dynamic membrane reshaping, offering new insights into cell signaling and membrane dynamics beyond classical models. These protein condensates influence membrane morphology through both macroscopic and molecular interactions.

Keywords:
CondensatesEndocytosisMembrane curvaturePhase separation

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Area of Science:

  • Cell Biology
  • Biophysics
  • Biochemistry

Background:

  • Proteins form dynamic assemblies on cell membranes, crucial for processes like signaling and endocytosis.
  • Phase separation is a key mechanism for organizing these protein assemblies.
  • Protein condensates can alter membrane shape, impacting cellular functions.

Purpose of the Study:

  • To review mechanisms of curvature generation by protein condensates.
  • To contrast condensate-driven mechanisms with classical membrane remodeling.
  • To highlight the role of protein phase separation in membrane dynamics.

Main Methods:

  • Literature review of studies on protein phase separation and membrane remodeling.
  • Analysis of mechanisms involving protein condensates and membrane morphology.
  • Comparison of condensate-driven curvature with scaffolding and helix insertion.

Main Results:

  • Protein condensates modulate membrane morphology through lateral and 3D phase separation.
  • Condensate-driven membrane reshaping occurs in endocytosis, autophagosome formation, and vacuole morphogenesis.
  • Mechanisms depend on interfacial energies and molecular interactions like protein-lipid binding.

Conclusions:

  • Protein phase separation represents a novel mechanism for membrane remodeling.
  • Condensate-driven curvature generation integrates macroscopic and microscopic factors.
  • Understanding these processes is vital for cell signaling and membrane dynamics research.