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UNC-16 (JIP3) Acts Through Synapse-Assembly Proteins to Inhibit the Active Transport of Cell Soma Organelles to Caenorhabditis elegans Motor Neuron Axons
Abstract
The conserved protein UNC-16 (JIP3) inhibits the active transport of some cell soma organelles, such as lysosomes, early endosomes, and Golgi, to the synaptic region of axons. However, little is known about UNC-16’s organelle transport regulatory function, which is distinct from its Kinesin-1 adaptor function. We used an unc-16 suppressor screen in Caenorhabditis elegans to discover that UNC-16 acts through CDK-5 (Cdk5) and two conserved synapse assembly proteins: SAD-1 (SAD-A Kinase), and SYD-2 (Liprin-α). Genetic analysis of all combinations of double and triple mutants in unc-16(+) and unc-16(−) backgrounds showed that the three proteins (CDK-5, SAD-1, and SYD-2) are all part of the same organelle transport regulatory system, which we named the CSS system based on its founder proteins. Further genetic analysis revealed roles for SYD-1 (another synapse assembly protein) and STRADα (a SAD-1-interacting protein) in the CSS system. In an unc-16(−) background, loss of the CSS system improved the sluggish locomotion of unc-16 mutants, inhibited axonal lysosome accumulation, and led to the dynein-dependent accumulation of lysosomes in dendrites. Time-lapse imaging of lysosomes in CSS system mutants in unc-16(+) and unc-16(−) backgrounds revealed active transport defects consistent with the steady-state distributions of lysosomes. UNC-16 also uses the CSS system to regulate the distribution of early endosomes in neurons and, to a lesser extent, Golgi. The data reveal a new and unprecedented role for synapse assembly proteins, acting as part of the newly defined CSS system, in mediating UNC-16’s organelle transport regulatory function.
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The phenotype of Y71H2AM.2(null) worms reflects in many regards that of worms depleted of the JIP3/4 homolog UNC-16, in particular the redistribution of lysosomes to the more proximal axon.
“The phenotype of the Y71H2AM.2(null)worms interestingly reflects in many regards that of worms depleted of the JIP3/4 homolog UNC-16 (the C. elegans homolog of JIP3/4), in particular the redistribution of lysosomes to the more proximal axon (Celestino et al., 2022;Edwards et al., 2015;Edwards et al., 2013)”
From TMEM55B promotes anterograde transport and distal axonal distribution of LAMP1-positive organelles (2026) · cites this paper as Edwards et al., 2015
UNC-16-deficient worms show a clearly aggravated phenotype, including uncoordinated movement, which is not the case for Y71H2AM.2(null) worms.
“However, UNC-16-deficient worms show a clearly aggravated phenotype, including uncoordinated movement, which is not the case for Y71H2AM.2(null)worms”
From TMEM55B promotes anterograde transport and distal axonal distribution of LAMP1-positive organelles (2026) · cites this paper as Edwards et al., 2015
Citations
Cites
The Molecular Motor Toolbox for Intracellular Transport
Vale, R. D. (2003) · Cell · doi:10.1016/s0092-8674(03)00111-9 · Cited by 1,982
Kinesin superfamily motor proteins and intracellular transport
Hirokawa, N., Noda, Y., Tanaka, Y., & Niwa, S. (2009) · Nature Reviews Molecular Cell Biology · doi:10.1038/nrm2774 · Cited by 1,859 · cited 1×
“Plus-end-directed motors from the large family of kinesins carry synaptic vesicles and organelles outward, while the minus-end-directed motor dynein moves them in the opposite direction (Vale 2003; Holzbaur 2004; Hirokawa et al. 2009, 2010).”
BackgroundAxonal transport deficits and neurodegenerative diseases
Millecamps, S., & Julien, J.-P. (2013) · Nature Reviews Neuroscience · doi:10.1038/nrn3380 · Cited by 755 · cited 1×
“…in the axonal transport machinery with neurodegenerative disorders in mice and humans underscores the importance of a properly functioning transport system for the long-term viability of neurons (Holzbaur 2004; El-Kadi et al. 2007; De Vos et al. 2008; Millecamps and Julien 2013; Maday et al. 2014).”
BackgroundSYD-2 Liprin-α organizes presynaptic active zone formation through ELKS
Dai, Y., Taru, H., Deken, S. L., Grill, B., Ackley, B., Nonet, M. L., & Jin, Y. (2006) · Nature Neuroscience · doi:10.1038/nn1808 · Cited by 218
Hierarchical assembly of presynaptic components in defined C. elegans synapses
Patel, M. R., Lehrman, E. K., Poon, V. Y., Crump, J. G., Zhen, M., Bargmann, C. I., & Shen, K. (2006) · Nature Neuroscience · doi:10.1038/nn1806 · Cited by 178
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Lilley, B. N., Pan, Y. A., & Sanes, J. R. (2013) · Neuron · doi:10.1016/j.neuron.2013.05.017 · Cited by 63
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TMEM55B promotes anterograde transport and distal axonal distribution of LAMP1-positive organelles
Rudnik, S., Li, C. H., Gottschling, D.-C., Veh, A., Barbosa, D. J., Richter, J., Stroobants, S., Schuster, B., Beck, I. M., Sedlack, R., et al. (2026) · doi:10.64898/2026.10.27.762112
Metadata
- Authors
- Edwards, S. L., Morrison, L. M., Yorks, R. M., Hoover, C. M., Boominathan, S., & Miller, K. G.
- Affiliations
- Genetic Models of Disease Laboratory, Oklahoma Medical Research Foundation, Oklahoma City, Oklahoma 73104
- Venue
- Genetics
- Publisher
- Oxford University Press (OUP)
- Published
- 2015-09-01
- Volume
- 201
- Issue
- 1
- Pages
- 117-141
- ISSN
- 1943-2631
- Cited by
- 34
- References
- 7
- Language
- en
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