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Related Concept Videos

Introduction to Membrane Proteins01:16

Introduction to Membrane Proteins

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The cell membrane, or plasma membrane, is an ever-changing landscape. It is described as a fluid mosaic where various macromolecules are embedded in the phospholipid bilayer. Among the macromolecules are proteins. The protein content varies across cell types. For example, mitochondrial inner membranes contain ~76% protein content, while myelin contains ~18% protein content. Individual cells contain many types of membrane proteins—red blood cells contain over 50—and different cell...
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A key characteristic of life is the ability to separate the external environment from the internal space. To do this, cells have evolved semi-permeable membranes that regulate the passage of biological molecules. Additionally, the cell membrane defines a cell’s shape and interactions with the external environment. Eukaryotic cell membranes also serve to compartmentalize the internal space into organelles, including the endomembrane structures of the nucleus, endoplasmic reticulum and...
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A cell's plasma membrane demarcates the cell's borders and determines the nature of its interaction with the environment. Cells exclude certain substances, take in others, and excrete some others in controlled quantities. The plasma membrane must be flexible to allow certain cells, such as red and white blood cells, to change their shape while passing through narrow capillaries. These are the more obvious plasma membrane functions. In addition, the plasma membrane's surface carries...
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Membrane Fluidity01:23

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Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
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Lipids are an essential component of all biological membranes. The average lipid content in mammalian membranes is 50%, though it can be as low as 20% in the inner mitochondrial membrane or as high as 80% in the myelin sheath present around the nerve cells.
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ESCRTs in membrane sealing.

Maja Radulovic1,2, Harald Stenmark3,2

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The endosomal sorting complex required for transport (ESCRT) machinery regulates cell membrane dynamics. This review highlights ESCRT proteins

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The endosomal sorting complex required for transport (ESCRT) machinery is crucial for cellular membrane dynamics.
  • Initially studied in yeast for vacuolar cargo sorting, ESCRT proteins are now recognized for diverse membrane remodeling roles.
  • Dysfunctional ESCRT machinery is linked to various human diseases.

Purpose of the Study:

  • To review the critical role of ESCRT proteins in membrane deformation.
  • To specifically focus on the function of ESCRT in membrane sealing and repair processes.

Main Methods:

  • This mini-review synthesizes existing research on ESCRT machinery.
  • Literature analysis focusing on ESCRT's involvement in membrane dynamics.

Main Results:

  • ESCRT machinery assembles on the cytosolic side of membranes.
  • It stabilizes concave membranes, facilitates budding, and mediates scission of membrane necks.
  • ESCRT proteins are essential for processes including cell division, nuclear envelope repair, and plasma membrane repair.

Conclusions:

  • The ESCRT machinery is a versatile regulator of membrane remodeling.
  • Its function in membrane sealing and repair is vital for cellular integrity.
  • Understanding ESCRT's role is key to addressing diseases linked to its dysfunction.