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Mol Biol Cell. 2015 Sep 15;26(18):3275-88. doi: 10.1091/mbc.E15-02-0093. Epub 2015 Jul 22.

The EHD protein Past1 controls postsynaptic membrane elaboration and synaptic function.

Author information

1
Rosenstiel Basic Medical Sciences Research Center, Department of Biology, Brandeis University, Waltham, MA 02453.
2
Department of Anatomy and Cell Biology, University of Iowa, Iowa City, IA 52242.
3
Rosenstiel Basic Medical Sciences Research Center, Department of Biology, Brandeis University, Waltham, MA 02453 arodal@brandeis.edu.

Abstract

Membranes form elaborate structures that are highly tailored to their specialized cellular functions, yet the mechanisms by which these structures are shaped remain poorly understood. Here, we show that the conserved membrane-remodeling C-terminal Eps15 Homology Domain (EHD) protein Past1 is required for the normal assembly of the subsynaptic muscle membrane reticulum (SSR) at the Drosophila melanogaster larval neuromuscular junction (NMJ). past1 mutants exhibit altered NMJ morphology, decreased synaptic transmission, reduced glutamate receptor levels, and a deficit in synaptic homeostasis. The membrane-remodeling proteins Amphiphysin and Syndapin colocalize with Past1 in distinct SSR subdomains and collapse into Amphiphysin-dependent membrane nodules in the SSR of past1 mutants. Our results suggest a mechanism by which the coordinated actions of multiple lipid-binding proteins lead to the elaboration of increasing layers of the SSR and uncover new roles for an EHD protein at synapses.

PMID:
26202464
PMCID:
PMC4569317
DOI:
10.1091/mbc.E15-02-0093
[Indexed for MEDLINE]
Free PMC Article

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