Cargo Sorting
Cargo Sorting - Related Videos
08:06
Identification of Kinesin-1 Cargos Using Fluorescence Microscopy
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Cited by 1 •
2016
Here, a protocol is presented to identify Kinesin-1 cargos. A motorless mutant of the Kinesin-1 heavy chain (KIF5B) aggregates in the cytoplasm and induces aggregation of its cargos. Both aggregates are detected under fluorescence microscopy. A similar strategy can be employed to identify cargos of other motor proteins.
02:35
Visualizing Intracellular Transport of Cargo in Cultured Astrocytes
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2025
Source: Creighton, B. A., et al. Visualizing and Analyzing Intracellular Transport of Organelles and Other Cargos in Astrocytes. J. Vis. Exp. (2019)This video demonstrates the visualization of intracellular cargo transport in cultured astrocytes using a fluorescent acidotropic probe that selectively labels acidic endolysosomal vesicles. Time-lapse imaging and Z-stack acquisition with a confocal microscope allow tracking of fluorescently labeled cargo throughout the three-dimensional cell volume.
09:00
Cargo Loading onto Kinesin Powered Molecular Shuttles
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Cited by 4 •
2010
Molecular shuttles consisting of functionalized microtubules gliding on surface-adhered kinesin motor proteins can serve as a nanoscale transport system. Here, the assembly of a typical shuttle system is described.
11:09
Characterizing the Composition of Molecular Motors on Moving Axonal Cargo Using "Cargo Mapping" Analysis
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Cited by 8 •
2014
Intracellular transport of cargoes, such as vesicles or organelles, is carried out by molecular motor proteins that track on polarized microtubules. This protocol describes the correlation of the directionality of transport of individual cargo particles moving inside neurons, to the relative amount and type of associated motor proteins.
10:16
Targeted Plasma Membrane Delivery of a Hydrophobic Cargo Encapsulated in a Liquid Crystal Nanoparticle Carrier
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Cited by 3 •
2017
A liquid crystal nanoparticle (LCNP) nanocarrier is exploited as a vehicle for the controlled delivery of a hydrophobic cargo to the plasma membrane of living cells.
FAQs
Sorting begins when molecular sorting signals on cargo are recognized by adaptor proteins. These adaptors connect selected cargo with coat complexes on a donor membrane, allowing the cargo to become concentrated rather than distributed randomly. This selective capture helps determine which proteins, lipids, or other molecules enter a transport vesicle and supports delivery to the appropriate cellular compartment.
Coat complexes organize the donor membrane around selected cargo and promote formation of a budding transport vesicle. Their action links cargo capture to physical membrane remodeling, so the vesicle carries a concentrated molecular load. In this way, coats are not merely structural coverings; they help couple recognition of cargo to its departure from the donor compartment.
After a vesicle buds, coordinated tethering and SNARE activity help it connect with and fuse to a specific target compartment. Tethering contributes to the initial connection, while SNARE activity supports membrane fusion. This two-stage targeting process helps preserve the distinct functions and identities of the endoplasmic reticulum, Golgi apparatus, endosomes, lysosomes, and plasma membrane.
A useful pathway sequence follows cargo from signal recognition through adaptor binding and coat recruitment, concentration into a budding vesicle, and delivery to a target compartment. Analysis can then focus on tethering and SNARE activity at the fusion stage. Tracing these linked events connects molecular selection with movement between the endoplasmic reticulum, Golgi apparatus, endosomes, lysosomes, and plasma membrane.
Cargo sorting provides a framework for understanding how major cellular compartments exchange molecular material while retaining specialized roles. Following these routes reveals how the endoplasmic reticulum, Golgi apparatus, endosomes, lysosomes, and plasma membrane communicate. This perspective is useful when studying secretion, receptor recycling, and degradation, because each outcome depends on cargo reaching the compartment where it functions or is processed.
Disrupted trafficking pathways can disturb secretion, receptor recycling, and cellular homeostasis. Consequently, cargo sorting research provides context for investigating infection, neurodegeneration, and inherited trafficking disorders. These studies connect failures in molecular delivery with broader changes in cell function and help organize research around which cellular processes are affected when cargo does not reach its proper destination.