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Vol. 17, Issue 11, 4709-4719, November 2006

This Article Full Text Full Text (PDF) Supplemental Material All Versions of this Article: E06-03-0253v1 17/11/4709    most recent Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Nunes, P. Articles by Stewart, B. A. Search for Related Content PubMed PubMed Citation Articles by Nunes, P. Articles by Stewart, B. A.

Synaptic Vesicle Mobility and Presynaptic F-Actin Are Disrupted in a N-ethylmaleimide–sensitive Factor Allele of Drosophila

Paula Nunes^*, Nicola Haines^*, Venkat Kuppuswamy, David J. Fleet, and Bryan A. Stewart^*

Departments of *Biology and Computer Science, University of Toronto, Mississauga, Ontario, Canada L5L 1C6

Submitted April 3, 2006; Accepted August 9, 2006
Monitoring Editor: Erika Holzbaur

N-ethylmaleimide sensitive factor (NSF) can dissociate the soluble NSF attachment receptor (SNARE) complex, but NSF also participates in other intracellular trafficking functions by virtue of SNARE-independent activity. Drosophila that express a neural transgene encoding a dominant-negative form of NSF2 show an 80% reduction in the size of releasable synaptic vesicle pool, but no change in the number of vesicles in nerve terminal boutons. Here we tested the hypothesis that vesicles in the NSF2 mutant terminal are less mobile. Using a combination of genetics, pharmacology, and imaging we find a substantial reduction in vesicle mobility within the nerve terminal boutons of Drosophila NSF2 mutant larvae. Subsequent analysis revealed a decrease of filamentous actin in both NSF2 dominant-negative and loss-of-function mutants. Lastly, actin-filament disrupting drugs also decrease vesicle movement. We conclude that a factor contributing to the NSF mutant phenotype is a reduction in vesicle mobility, which is associated with decreased presynaptic F-actin. Our data are consistent with a model in which actin filaments promote vesicle mobility and suggest that NSF participates in establishing or maintaining this population of actin.

This article was published online ahead of print in MBC in Press (http://www.molbiolcell.org/cgi/doi/10.1091/mbc.E06-03-0253) on August 16, 2006.

Address correspondence to: Bryan Stewart (bstewart{at}utm.utoronto.ca)

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