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J Cell Biol. 2008 Dec 1;183(5):881-92. doi: 10.1083/jcb.200806088.

Mu2 adaptin facilitates but is not essential for synaptic vesicle recycling in Caenorhabditis elegans.

Author information

1
Howard Hughes Medical Institute and Department of Biology, University of Utah, Salt Lake City, UT 84112, USA.

Abstract

Synaptic vesicles must be recycled to sustain neurotransmission, in large part via clathrin-mediated endocytosis. Clathrin is recruited to endocytic sites on the plasma membrane by the AP2 adaptor complex. The medium subunit (micro2) of AP2 binds to cargo proteins and phosphatidylinositol-4 ,5-bisphosphate on the cell surface. Here, we characterize the apm-2 gene (also called dpy-23), which encodes the only micro2 subunit in the nematode Caenorhabditis elegans. APM-2 is highly expressed in the nervous system and is localized to synapses; yet specific loss of APM-2 in neurons does not affect locomotion. In apm-2 mutants, clathrin is mislocalized at synapses, and synaptic vesicle numbers and evoked responses are reduced to 60 and 65%, respectively. Collectively, these data suggest AP2 micro2 facilitates but is not essential for synaptic vesicle recycling.

PMID:
19047463
PMCID:
PMC2592831
DOI:
10.1083/jcb.200806088
[Indexed for MEDLINE]
Free PMC Article

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