期刊
GENETICS
卷 201, 期 1, 页码 117-+出版社
GENETICS SOCIETY AMERICA
DOI: 10.1534/genetics.115.177345
关键词
Caenorhabditis elegans; axonal transport; JIP3; Cdk5; Liprin; SAD-A; dynein
资金
- National Institutes of Health (NIH) Office of Research Infrastructure Programs [P40OD010440]
- National Institute of General Medical Sciences of the NIH [R01GM080765]
- Oklahoma Center for the Advancement of Science and Technology [HR14-003]
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-a). Genetic analysis of all combinations of double and triple mutants in unc-16(+) and unc-16(2) 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 STRAD alpha (a SAD-1-interacting protein) in the CSS system. In an unc-16(2) 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(2) 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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