期刊
JOURNAL OF NEUROSCIENCE
卷 31, 期 45, 页码 16261-16268出版社
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.0002-11.2011
关键词
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资金
- Ministry of Education, Culture, Sports, Science, and Technology [21790057, 23790070]
- Akiyama Life Science Foundation
- Suzuken Memorial Foundation
- Japanese Society for Promoting Science
- Hokkaido University
- NIH [NS035546]
- Taru Lab
- Chisholm laboratory
- Jin laboratory
- Grants-in-Aid for Scientific Research [23790070, 21790057] Funding Source: KAKEN
Synapses are asymmetric structures that are specialized for neuronal signal transduction. A unique set of proteins is present at the presynaptic active zone, which is a core structure essential for neurotransmitter release. In Caenorhabditis elegans HSN neurons, SYD-2, a Liprin-alpha family protein, acts together with a GAP protein SYD-1 to promote presynaptic assembly. Previous studies have shown that elevating the activity of syd-2 can bypass the requirement of syd-1. Liprin-alpha proteins are composed of coiled-coil-rich regions in the N-terminal half, which mediate interactions with adapter proteins at the presynaptic active zone, and three SAM domains in the C terminus, which bind proteins such as LAR receptor tyrosine phosphatase. To address the molecular mechanism by which SYD-2 activity is regulated, we performed structure-function studies. By monitoring the ability of SYD-2 transgenes to rescue syd-2(lf) and to suppress syd-1(lf) phenotypes in HSN neuron synapses, we identified the N-terminal half of SYD-2 as minimally required for rescuing syd-2(lf) phenotypes. A highly conserved short coiled-coil segment named Liprin Homology 1 (LH1) domain is both necessary and sufficient to suppress syd-1(lf) defects. We show that the LH1 domain forms a dimer and promotes further oligomerization and/or complex formation of SYD-2/Liprin-alpha proteins. The role of the LH1 domain in presynaptic assembly can be partially complemented by artificial dimerization. These findings suggest a model by which the self-assembly of SYD-2/Liprin-alpha proteins mediated by the coiled-coil LH1 domain is one of the key steps to the accumulation of presynaptic components at nascent synaptic junctions.
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