Intracellular Protein Trafficking
Intracellular Protein Trafficking - Related Videos
07:55
Imaging the Intracellular Trafficking of APP with Photoactivatable GFP
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Cited by 6 •
2015
While the transport of cell surface proteins is relatively easily studied, visualizing the trafficking of intracellular proteins is much more difficult. Here, we use constructs incorporating photoactivatable GFP and demonstrate a method to accurately follow the amyloid precursor protein from the Golgi apparatus to down-stream compartments and follow its clearance.
10:41
Confocal and Super-Resolution Imaging of Polarized Intracellular Trafficking and Secretion of Basement Membrane Proteins During Drosophila Oogenesis
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Cited by 3 •
2022
The basement membrane is essential for tissue and organ morphogenesis during development. To better understand the mechanisms leading to proper placement of this structure, the protocol presented describes methods to visualize and characterize the intracellular trafficking and secretion of basement membrane proteins in epithelial cells using confocal and super-resolution microscopy.
08:55
Visualizing Intracellular SNARE Trafficking by Fluorescence Lifetime Imaging Microscopy
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Cited by 5 •
2017
This protocol describes a new method allowing for the quantitative visualization of complex formation of SNARE proteins, based on Förster resonance energy transfer, and fluorescence lifetime imaging microscopy.
04:58
Isolation of Cell-Surface and Intracellular Proteins from an Astrocyte Culture
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2025
This video demonstrates the isolation of cell-surface and intracellular proteins from an astrocyte culture. The astrocyte culture is placed on ice to inhibit endocytosis, and then the cell-surface proteins are labeled with a biotinylation reagent. The cells are lysed to release the biotinylated cell-surface proteins and non-biotinylated intracellular proteins. Finally, streptavidin-coated beads are used to separate the biotinylated cell-surface proteins from the intracellular proteins.
11:27
Analysis of SCAP N-glycosylation and Trafficking in Human Cells
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Cited by 17 •
2016
We describe a modified method for membrane fraction isolation from human cells and sample preparation for the detection of SCAP N-glycosylation and total protein by using western blot. We further introduce a GFP-labeling method to monitor SCAP trafficking using confocal microscopy. This protocol can be used in regular biology laboratories.
FAQs
Targeting signals act as address information on proteins. Transport machinery recognizes these signals and directs the molecules into the appropriate route, rather than allowing distribution to be random. This recognition links a protein’s molecular features to a specific organelle or membrane destination, helping preserve compartment-specific functions throughout the cell.
Vesicle-mediated transport connects the endoplasmic reticulum, Golgi apparatus, endosomes, lysosomes, and plasma membrane as an organized network. Movement along these routes supports secretion, membrane maintenance, organelle function, and protein degradation. The pathway selected therefore affects not only where a protein arrives, but also whether it contributes to surface activity, compartment function, or cellular disposal.
Accurate sorting keeps proteins associated with the compartments where they can perform their intended functions. If targeting or transport fails, proteins may be misplaced and cellular organization can be disrupted. This principle provides a mechanistic link between trafficking defects and broad biological consequences, including neurodegeneration, immune dysfunction, and metabolic disease.
An informative analysis follows the connection between four elements: a protein’s targeting signal, the transport machinery that recognizes it, the route it enters, and the destination it reaches. Comparing these elements across pathways helps distinguish sorting into the endoplasmic reticulum, Golgi apparatus, endosomes, lysosomes, or plasma membrane and clarifies the resulting cellular role.
Protein trafficking directly supports secretion, membrane maintenance, organelle function, and protein degradation. These outcomes show why the process matters beyond transport itself: correct delivery helps maintain cellular membranes, sustain specialized organelle activities, and remove proteins through the appropriate degradative route. Examining these functions can connect a trafficking pathway to a broader cellular consequence.
In biology, intracellular protein trafficking provides a framework for understanding how cells organize biochemical activities across separate compartments. Its study links molecular recognition and transport routes to larger processes such as secretion, degradation, and membrane maintenance. It also offers context for interpreting disease-related changes, because defects in sorting or movement can affect nervous, immune, and metabolic functions.