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Related Concept Videos

Introduction to Membrane Traffic01:44

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The ER, Golgi apparatus, endosomes, and lysosomes work in tandem to modify, sort, and package proteins and lipids. An integrated membrane trafficking network facilitates the back and forth shuttling of molecules within different organelles in the same cell or across the cell membrane.
The transport of soluble and membrane proteins is mediated by transport vesicles that collect cargo from one cellular compartment and deliver it to another by fusing with the target organelle membrane. The Rab...
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ER Retrieval Pathway01:45

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In the secretory pathway, vesicles transport proteins from one cellular compartment to another in forward transport to deliver the protein to its correct location. Occasionally, misfolded proteins and incorrect proteins escape their original compartments, and a retrieval pathway is used to return the escaped proteins to their original compartment.
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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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Export of Misfolded Proteins out of the ER01:32

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After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...
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After budding out from the ER membrane, some COPII vesicles lose their coat and fuse with one another to form larger vesicles and interconnected tubules called vesicular tubular clusters or VTCs. These clusters constitute a compartment at the ER-Golgi interface known as ERGIC (Endoplasmic Reticulum Golgi Intermediate Compartment). The ERGIC is a mobile membrane-bound cargo transport system that sorts proteins secreted from ER and delivers them to the Golgi.
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Related Experiment Video

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Author Spotlight: Image-Based Methods to Study Membrane Trafficking Events in Stomatal Lineage Cells
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Membrane trafficking: returning to the fold(ER).

Ana M Perez-Linero1, Manuel Muñiz1

  • 1Departamento de Biología Celular, Facultad de Biología, Universidad de Sevilla, 41012 Sevilla, Spain; Instituto de Biomedicina de Sevilla (IBiS), Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla, 41013 Sevilla, Spain.

Current Biology : CB
|April 2, 2015
PubMed
Summary
This summary is machine-generated.

A novel cargo receptor was discovered that retrieves escaped endoplasmic reticulum (ER) folding machinery from the Golgi apparatus. This finding is crucial for maintaining secretory organelle function and homeostasis.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Organelle Biology

Background:

  • Secretory organelles require precise retrieval mechanisms to maintain cellular homeostasis.
  • Escaped proteins from the endoplasmic reticulum (ER) can disrupt Golgi apparatus function.
  • Understanding protein trafficking is key to cellular health.

Purpose of the Study:

  • To identify novel mechanisms for retrieving mislocalized proteins.
  • To characterize the function of a newly discovered cargo receptor.
  • To elucidate the process of maintaining secretory organelle composition.

Main Methods:

  • Proteomic analysis to identify potential cargo receptors.
  • Biochemical assays to confirm receptor-cargo interactions.
  • Cellular imaging to track protein localization and retrieval.

Main Results:

  • A novel class of cargo receptor was identified.
  • This receptor specifically binds and retrieves ER folding machinery from the Golgi.
  • The retrieval process is essential for preventing organelle dysfunction.

Conclusions:

  • The identified cargo receptor plays a critical role in protein quality control.
  • This mechanism ensures the fidelity of the secretory pathway.
  • Disruption of this pathway could lead to various cellular pathologies.