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Related Concept Videos

Endoplasmic Reticulum01:39

Endoplasmic Reticulum

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The Endoplasmic Reticulum (ER) in eukaryotic cells is a substantial network of interconnected membranes with diverse functions, from calcium storage to biomolecule synthesis. A primary component of the endomembrane system, the ER manufactures phospholipids critical for membrane function throughout the cell. Additionally, the two distinct regions of the ER specialize in the manufacture of specific lipids and proteins.
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The Endoplasmic Reticulum01:43

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The endoplasmic reticulum or ER makes up for more than half of the membranes in a cell and accounts for 10% of total cell volume. It is also the primary protein and lipid synthesis factory for most cell organelles, such as the Golgi apparatus, lysosomes, secretory vesicles, and the plasma membrane. Despite being the most extensive and functionally complex subcellular organelle, ER was the last to be discovered. After years of deliberation, Keith Porter and George Palade in the year 1954,...
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The Endoplasmic Reticulum01:43

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Assembly of the Lipid Bilayer in the ER01:28

Assembly of the Lipid Bilayer in the ER

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Biological membranes are more than just a barrier separating cell cytoplasm from the outside environment. They are highly dynamic and help maintain the integrity and physiological stability of the cells as well as membrane-bound organelles. Membranes also play vital roles in cell-to-cell and intracellular communication.
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Golgi Apparatus01:49

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As they leave the Endoplasmic Reticulum (ER), properly folded and assembled proteins are selectively packaged into vesicles. These vesicles are transported by microtubule-based motor proteins and fuse together to form vesicular tubular clusters, subsequently arriving at the Golgi apparatus, a eukaryotic endomembrane organelle that often has a distinctive ribbon-like appearance.
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Golgi Apparatus01:09

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Properly folded and assembled proteins are selectively packaged into vesicles that exit the ER. Motor proteins transport these vesicles to the Golgi apparatus for adding modifications that make these proteins functional at their destination.
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Study of Endoplasmic Reticulum and Mitochondria Interactions by In Situ Proximity Ligation Assay in Fixed Cells
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Study of Endoplasmic Reticulum and Mitochondria Interactions by In Situ Proximity Ligation Assay in Fixed Cells

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Endoplasmic Reticulum-Plasma Membrane Associations:Structures and Functions.

Alessandra Gallo1, Christian Vannier1, Thierry Galli1

  • 1Membrane Traffic in Health & Disease Group (INSERM ERL U950), F-75013 Paris, France;

Annual Review of Cell and Developmental Biology
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PubMed
Summary
This summary is machine-generated.

Membrane contact sites (MCSs) facilitate lipid and calcium exchange between organelles. This review details ER-PM MCS structure, function, and protein-mediated lipid transfer, crucial for cell growth and development.

Keywords:
ER-PM junctionsendoplasmic reticulumlipid transfer proteinsmembrane traffickingnonvesicular lipid transporttethers

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Last Updated: Mar 19, 2026

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Area of Science:

  • Cell Biology
  • Biochemistry

Background:

  • Membrane contact sites (MCSs) are critical cellular junctions where organelles communicate.
  • These sites, with inter-membrane distances <30 nm, facilitate lipid and calcium exchange.

Purpose of the Study:

  • To review the structure and function of MCSs between the endoplasmic reticulum (ER) and plasma membrane (PM).
  • To elucidate the mechanisms of tethering structures and protein-mediated lipid exchange at ER-PM MCSs.

Main Methods:

  • Literature review focusing on structural and functional aspects of MCSs.
  • Analysis of protein-mediated mechanisms for nonvesicular lipid transfer.

Main Results:

  • Tethering structures are key to forming and maintaining ER-PM MCSs.
  • Specific proteins mediate nonvesicular lipid exchange, impacting organelle identity.
  • ER-PM MCSs regulate cell growth and development.

Conclusions:

  • MCSs, particularly between ER and PM, are vital for cellular homeostasis and signaling.
  • Understanding protein-mediated lipid exchange at MCSs offers insights into cell growth regulation.