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MBC in Press, published online ahead of print August 16, 2006
Mol. Biol. Cell 10.1091/mbc.E06-03-0253

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Submitted on April 3, 2006
Accepted on August 9, 2006

Synaptic Vesicle Mobility and Presynaptic F-Actin Are Disrupted in an NSF Allele of Drosophila

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

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

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 establishing or maintaining this population of actin.

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




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