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Related Concept Videos

Clathrin Coated Vesicles01:12

Clathrin Coated Vesicles

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Clathrin-coated vesicles use endocytosis to transport receptors and lysosomal hydrolases from the Golgi to the lysosome in the late secretory pathway. Clathrin-mediated endocytosis was the first described endocytic process, and Clathrin-coated vesicles remain one of the most well-studied transport vesicles. The molecular machinery that generates clathrin-coated vesicles comprises over 50 proteins that precisely coordinate vesicle formation. Cell surface receptors concentrated in indented sites...
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Membrane-enclosed structures called vesicles transport proteins and lipids across the cell. The vesicles derive their cargo from the plasma membrane, Golgi, ER, or endosome. Coated vesicles are spherical, protein-coated carriers with a 50–100 nm diameter that mediate bidirectional transport between the ER and the Golgi. The distribution of proteins between the ER and Golgi complex is dynamic and is maintained by different coated vesicles. Their formation is driven by the assembly of...
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Structure of Cadherins01:25

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The cadherins were one of the first cell adhesion molecules discovered; the term “cadherins”   is based on their calcium-dependent adhering properties. The first cadherins discovered on the epithelial, neuronal, and placental cells were named E-cadherin, P-cadherin, and N-cadherin, respectively. These classical cadherins share sequence and structural similarities. Other cadherins, including those involved in cell signaling, are grouped into non-classical cadherins. This...
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Vesicle budding is orchestrated by distinct cytosolic proteins such as adaptor proteins, coat proteins, and GTPases. To initiate vesicle budding, membrane-bending proteins containing crescent-shaped BAR domains bind to the lipid heads in the bilayer and distort the membrane to form a protein-coated vesicle bud. Adaptors proteins such as AP2 for clathrin-coated vesicles can nucleate on the deformed membrane. Finally, coat proteins such as clathrin or COPI and COPII assemble into a coat forming...
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Structure of Porins01:21

Structure of Porins

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Mitochondria, chloroplasts, and gram-negative bacteria have transmembrane, beta-barrel proteins called porins to mediate the free diffusion of ions and metabolites across the membrane. Mitochondrial porin precursors contain conserved amino acid sequences called beta signals at their C-terminal. Beta signals have a  motif of PoXGXXHyXHy (Po-Polar, X-Any amino acid, G-Glycine, Hy-LargeHydrophobic), which are crucial for precursor recognition to initiate precursor assembly. Beta-barrel...
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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.
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Related Experiment Video

Updated: Sep 23, 2025

In Vitro Reconstitution of the Actin Cytoskeleton Inside Giant Unilamellar Vesicles
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The structure of caveolin finally takes shape.

Robert G Parton1,2, Brett M Collins1

  • 1Institute for Molecular Bioscience, The University of Queensland, St. Lucia, Queensland 4072, Australia.

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|May 11, 2022
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Summary

Cryo-electron microscopy has revealed the structure of caveolin, a key membrane protein. This breakthrough offers new insights into the function of caveolae, crucial cellular structures.

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Area of Science:

  • Cell biology
  • Structural biology
  • Biochemistry

Background:

  • Caveolae are small, flask-shaped invaginations of the plasma membrane found in many cell types.
  • Caveolin is the primary structural protein of caveolae, playing a vital role in their formation and function.
  • Understanding caveolin structure is essential for elucidating caveolae-mediated cellular processes.

Purpose of the Study:

  • To determine the high-resolution structure of caveolin using cryo-electron microscopy.
  • To provide novel structural insights into the molecular mechanisms of caveolin assembly and function within caveolae.

Main Methods:

  • Cryo-electron microscopy (cryo-EM) was employed to visualize caveolin.
  • Advanced image processing techniques were used to reconstruct the 3D structure of the protein complex.

Main Results:

  • The study presents the detailed cryo-EM structure of caveolin.
  • Structural data reveals new information about caveolin oligomerization and its interaction with the cell membrane.
  • These findings illuminate the molecular basis of caveolin's role in caveolae formation.

Conclusions:

  • The determined structure of caveolin provides unprecedented molecular details.
  • This structural understanding enhances our knowledge of caveolae biogenesis and function.
  • The findings pave the way for future research into caveolin-related cellular signaling and disease.