Key Points
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Nearly every aspect of neuronal function depends on the accurate localization of polarized membrane proteins to the axon or dendrites.
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Selective sorting, selective transport and selective delivery are the key events for maintaining neuronal polarity.
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Some of the sorting signals and sorting adaptors that mediate the targeting of dendritic proteins have been identified. By contrast, little is known about the mechanisms underlying axonal protein sorting.
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Selective microtubule-based transport is crucial for the targeting of both axonal and dendritic proteins. The basis for selective transport depends on the regulation of motor proteins, but the underlying mechanisms remain controversial.
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There must be links between the process of protein sorting, which determines the cargoes present in a vesicle and hence the identity of a vesicle, and the recruitment of the correct motors, SNAREs (soluble N-ethylmaleimide-sensitive factor attachment protein receptors) and tethers, which determine the fate of a vesicle. Almost nothing is yet known about these links.
Abstract
As polarized cells, neurons maintain different sets of resident plasma membrane proteins in their axons and dendrites, which is consistent with the different roles that these neurites have in electrochemical signalling. Axonal and dendritic proteins are synthesized together within the somatodendritic domain; this raises a fundamental question: what is the nature of the intracellular trafficking machinery that ensures that these proteins reach the correct domain? Recent studies have advanced our understanding of the processes underlying the selective sorting and selective transport of axonal and dendritic proteins and have created potential avenues for future progress.
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Acknowledgements
The work in the authors' laboratory is supported by the US National Institutes of Health (NIH MH066179). The authors thank S. Kaech for her comments on the manuscript and S. Henderson for help in creating the figures. The images in Figure 2, panels b and c, are supplied by M.B. and G.B.
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Supplementary information
Supplementary information S1 (movie)
A movie of a cultured neuron co-expressing axonal and dendritic proteins. Movie shows proteins being transported within the neuron. (M.B. and G.B., unpublished observations). (MOV 1071 kb)
Glossary
- Polarized cells
-
Cells composed of two distinct domains, which differ in molecular composition. Examples include epithelial cells, oocytes and neurons.
- Cargoes
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In the context of protein trafficking, cargoes refer to membrane proteins that must be moved from one compartment to another.
- Endosomes
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Intracellular organelles involved in the trafficking of proteins internalized from the plasma membrane.
- Coat proteins
-
Protein components that bind to the cytosolic face of membranes, serving to concentrate cargoes into new vesicles and to induce bud formation. Some coat proteins form an electron-dense 'coat' that is visible by electron microscopy, hence the name.
- Glycoproteins
-
Proteins that are post-translationally modified by the addition of sugar chains to ectodomain amino acid residues.
- Tethering proteins
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Also known as tethering factors. Proteins that initiate the first interaction between a vesicle and the target membrane where the vesicle will undergo fusion.
- Motor adaptors
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Proteins that link kinesin or dynein motors to vesicles or other cargoes.
- Submembranous scaffolding proteins
-
Proteins that form complexes located just beneath the plasma membrane that bind to and concentrate specific sets of plasma membrane and cytosolic proteins.
- Canonical sorting motifs
-
Sorting sequences that share a common three-dimensional structure that allows them to interact with identified binding pockets in heterotetrameric adaptor proteins.
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Bentley, M., Banker, G. The cellular mechanisms that maintain neuronal polarity. Nat Rev Neurosci 17, 611–622 (2016). https://doi.org/10.1038/nrn.2016.100
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DOI: https://doi.org/10.1038/nrn.2016.100
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