Sentryn Acts with a Subset of Active Zone Proteins To Optimize the Localization of Synaptic Vesicles in <i>Caenorhabditis elegans</i>

Genetics - Tập 210 Số 3 - Trang 947-968 - 2018
Stacey L. Edwards1, Logan M Morrison1, Laura Manning2, Natalia Stec1, Janet E. Richmond2, Kenneth G. Miller1
1Genetic Models of Disease Laboratory, Oklahoma Medical Research Foundation, Oklahoma 73104
2Department of Biological Sciences, University of Illinois at Chicago, Illinois 60607

Tóm tắt

Abstract Synaptic vesicles (SVs) transmit signals by releasing neurotransmitters from specialized synaptic regions of neurons. In the synaptic region, SVs are tightly clustered around small structures called active zones. The motor KIF1A transports SVs outward through axons until they are captured in the synaptic region. This transport must be guided in the forward direction because it is opposed by the dynein motor, which causes SVs to reverse direction multiple times en route. The core synapse stability (CSS) system contributes to both guided transport and capture of SVs. We identified Sentryn as a CSS protein that contributes to the synaptic localization of SVs in Caenorhabditis elegans. Like the CSS proteins SAD Kinase and SYD-2 (Liprin-α), Sentryn also prevents dynein-dependent accumulation of lysosomes in dendrites in strains lacking JIP3. Genetic analysis showed that Sentryn and SAD Kinase each have at least one nonoverlapping function for the stable accumulation of SVs at synapses that, when combined with their shared functions, enables most of the functions of SYD-2 (Liprin-α) for capturing SVs. Also like other CSS proteins, Sentryn appears enriched at active zones and contributes to active zone structure, suggesting that it is a novel, conserved active zone protein. Sentryn is recruited to active zones by a process dependent on the active zone-enriched CSS protein SYD-2 (Liprin-α). Our results define a specialized group of active zone enriched proteins that can affect motorized transport throughout the neuron and that have roles in both guided transport and capture of SVs.

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