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Related Concept Videos

The Endoplasmic Reticulum01:43

The Endoplasmic Reticulum

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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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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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Tail-anchoring of Proteins in the ER Membrane01:45

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Tail-anchored, or TA, proteins are estimated to make up to 3-5% of membrane proteins found in the eukaryotic cell. Such proteins have a single transmembrane domain located approximately 30 amino acid residues upstream from the C-terminal end. As a result, the signal recognition particle (SRP) cannot guide a TA protein to the ER membrane for cotranslational insertion. Hence, they are integrated into the ER membrane post-translationally using their C-terminal end as the anchor. TA proteins...
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Directing Proteins to the Rough Endoplasmic Reticulum01:34

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The organelle-specific signaling sequences direct proteins synthesized in the cytosol to their final destination like ER, mitochondria, peroxisomes, etc. Some of the proteins directed to ER are then trafficked via vesicles to other organelles within the cell or the extracellular environment through the Golgi complex. For example, the rough ER synthesizes soluble proteins for transportation to the lysosomes or secretion out of the cell. It can also synthesize transmembrane proteins that can...
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Post-translational Translocation of Proteins to the RER01:27

Post-translational Translocation of Proteins to the RER

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A sizable fraction of proteins destined for ER are first synthesized in the cell cytosol and then transported across the ER membrane–a process called post-translational translocation. Similar to cotranslationally translocated proteins, these proteins also use the Sec translocon complex to enter the ER lumen.
Targeting proteins to the ER
Hsp40 and Hsp70 chaperone molecules bind the translated proteins in the cytosol to prevent their folding. The chaperone binding helps to keep the signal...
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Protein Translocation Machinery on the ER Membrane01:28

Protein Translocation Machinery on the ER Membrane

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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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Visualization of Endoplasmic Reticulum Subdomains in Cultured Cells
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Moving the ER tip by tip.

Ha H Nguyen1, Ginny G Farías1

  • 1Cell Biology, Neurobiology, and Biophysics, Department of Biology, Faculty of Science, Utrecht University, Utrecht 3584 CH, the Netherlands.

Developmental Cell
|December 21, 2021
PubMed
Summary
This summary is machine-generated.

The study reveals that TAOK2, a kinase found in the endoplasmic reticulum (ER), controls how ER and microtubule (MT) tips dynamically connect. This finding explains a key mechanism regulating ER-MT interactions in cells.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cytoskeleton Dynamics

Background:

  • Interactions between the endoplasmic reticulum (ER) and microtubules (MTs) are crucial for cellular organization and function.
  • The precise molecular mechanisms regulating the dynamic tethering of ER and MT tips remain largely uncharacterized.

Purpose of the Study:

  • To elucidate the regulatory mechanisms governing ER-MT tip interactions.
  • To identify key proteins involved in the dynamic tethering of ER and MT tips.

Main Methods:

  • Utilized cell imaging techniques to observe ER-MT interactions in live cells.
  • Investigated the role of ER-localized kinases in mediating these interactions.
  • Performed biochemical assays to confirm protein localization and activity.

Main Results:

  • Identified TAOK2, an ER-localized kinase, as a critical regulator of ER-MT tethering.
  • Demonstrated that TAOK2 directly catalyzes the dynamic connection between ER and MT tips.
  • Showcased the dynamic nature of ER-MT tip tethering mediated by TAOK2.

Conclusions:

  • TAOK2 is a key enzyme that orchestrates the dynamic tethering of ER and MT tips.
  • This discovery provides novel insights into the regulation of ER-MT interactions at a molecular level.
  • The findings open new avenues for understanding cellular architecture and transport.