GSBS Student Publications

Student Author(s)

James Ashley

GSBS Program

Neuroscience

UMMS Affiliation

Department of Neurobiology; Budnik Lab; Graduate School of Biomedical Sciences, Neuroscience Program

Date

1-31-2007

Document Type

Article

Medical Subject Headings

Amino Acid Sequence; Animals; Drosophila; Drosophila Proteins; Drug Resistance; Molecular Sequence Data; Presynaptic Terminals; SNARE Proteins; Synaptic Membranes; Tumor Suppressor Proteins

Disciplines

Neuroscience and Neurobiology

Abstract

Targeted membrane addition is a hallmark of many cellular functions. In the nervous system, modification of synaptic membrane size has a major impact on synaptic function. However, because of the complex shape of neurons and the need to target membrane addition to very small and polarized synaptic compartments, this process is poorly understood. Here, we show that Gtaxin (GTX), a Drosophila t-SNARE (target-soluble N-ethylmaleimide-sensitive factor attachment protein receptor), is required for expansion of postsynaptic membranes during new synapse formation. Mutations in gtx lead to drastic reductions in postsynaptic membrane surface, whereas gtx upregulation results in the formation of complex membrane structures at ectopic sites. Postsynaptic GTX activity depends on its direct interaction with Discs-Large (DLG), a multidomain scaffolding protein of the PSD-95 (postsynaptic density protein-95) family with key roles in cell polarity and formation of cellular junctions as well as synaptic protein anchoring and trafficking. We show that DLG selectively determines the postsynaptic distribution of GTX to type I, but not to type II or type III boutons on the same cell, thereby defining sites of membrane addition to this unique set of glutamatergic synapses. We provide a mechanistic explanation for selective targeted membrane expansion at specific synaptic junctions.

Rights and Permissions

Citation: J Neurosci. 2007 Jan 31;27(5):1033-44. Link to article on publisher's site

Related Resources

Link to Article in PubMed

Journal Title

The Journal of neuroscience : the official journal of the Society for Neuroscience

PubMed ID

17267557

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