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Related Concept Videos

Overview of Protein Sorting and Transport01:45

Overview of Protein Sorting and Transport

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Eukaryotic cells have different membrane-bound organelles with distinct protein requirements. The process by which proteins are targeted to a specific organelle is called protein sorting.
Protein sorting can be of two types: signal-based sorting and vesicle-based trafficking. In signal-based sorting, specific amino acid sequences called sorting signals target proteins to the proper location inside the cell either via gated transport or by protein translocation.  In gated transport, folded...
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The Early Endosome: Endocytosis of Transferrin01:28

The Early Endosome: Endocytosis of Transferrin

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Essential proteins such as insulin or low-density lipoprotein (LDL) and micronutrients such as iron enter a eukaryotic cell through receptor-mediated endocytosis. Subsequently, the early endosomes fuse with the vesicles containing such receptor-ligand complexes and play a vital role in sorting the incoming ligands and receptors. While the ligands are either degraded inside the vesicle or released into the cytosol, their receptors are returned to the plasma membrane for further rounds of...
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Nuclear Protein Sorting01:34

Nuclear Protein Sorting

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Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
Proteins targeted to the nucleus carry nuclear localization signals or NLS recognized by import receptors in the cytosol. Similarly, proteins with nuclear export signals are recognized by export receptors. Import and export receptors are...
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Mitochondrial Protein Sorting01:39

Mitochondrial Protein Sorting

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Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death.  Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
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Signal Sequences and Sorting Receptors01:41

Signal Sequences and Sorting Receptors

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Signal sequences are short amino acid sequences that guide newly synthesized proteins to their proper location within the cell. Classical signal sequences are fifteen to sixty amino acids long and present at the N-terminus of a polypeptide chain. Each signal sequence has a conserved segment of basic residues towards their N terminus, a hydrophobic core, and a C-terminus rich in polar residues. The C-terminus also contains a signal cleavage site and features a -3 -1 sequence motif. The -3-1...
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Role of ER in the Secretory Pathway01:17

Role of ER in the Secretory Pathway

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Eukaryotic cells have a special pathway that enables communication between various intracellular membrane-bound compartments and also with the extracellular environment. This pathway is termed as the secretory pathway.
Components of the secretory pathway
About a third of proteins synthesized in the cell are sorted via the secretory route. They shuffle between different compartments in membrane-bound vesicles until they reach their final destination. The main intracellular compartments involved...
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Related Experiment Video

Updated: Aug 7, 2025

Analysis of Endocytic Uptake and Retrograde Transport to the Trans-Golgi Network Using Functionalized Nanobodies in Cultured Cells
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Analysis of Endocytic Uptake and Retrograde Transport to the Trans-Golgi Network Using Functionalized Nanobodies in Cultured Cells

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Protein sorting from endosomes to the TGN.

Dominik P Buser1, Anne Spang1

  • 1Biozentrum, University of Basel, Basel, Switzerland.

Frontiers in Cell and Developmental Biology
|March 10, 2023
PubMed
Summary
This summary is machine-generated.

Retrograde transport from endosomes to the trans-Golgi network recycles essential proteins and lipids. This process relies on specific sorting machineries for efficient cargo delivery and balancing cellular membrane traffic.

Keywords:
AP-1Rab9SNXTGNclathrinendosomeretrograde transportretromer

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Membrane Trafficking

Background:

  • Retrograde transport from endosomes to the trans-Golgi network (TGN) is crucial for recycling proteins and lipids.
  • This pathway counterbalances anterograde membrane traffic, maintaining cellular homeostasis.
  • Key cargoes include lysosomal enzymes, SNARE proteins, transporters, and toxins.

Purpose of the Study:

  • To review the diverse retrograde transport pathways from endosomes to the TGN.
  • To highlight the sorting machineries responsible for cargo recognition and concentration.
  • To discuss experimental approaches for analyzing endosome-to-TGN transport.

Main Methods:

  • Literature review of retrograde transport mechanisms.
  • Analysis of protein and lipid cargo sorting at endosomes.
  • Discussion of experimental techniques for studying endosome-TGN trafficking.

Main Results:

  • Identified various retrograde transport pathways regulated by distinct sorting machineries.
  • Emphasized the importance of selective cargo recognition for efficient retrograde movement.
  • Detailed the roles of sorting machineries in concentrating cargo for transport.

Conclusions:

  • Retrograde transport is vital for cellular function, involving complex sorting mechanisms.
  • Understanding these pathways is key to comprehending membrane traffic regulation.
  • Experimental analysis provides insights into the dynamics of endosome-to-TGN transport.