Synapsin I-associated phosphatidylinositol 3-kinase mediates synaptic vesicle delivery to the readily releasable pool
Date
2003
Authors
Cousin, Michael
Malladi, Chandra
Tan, Timothy
Raymond, Clarke
Smillie, Karen
Robinson, Phillip J
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American Society for Biochemistry and Molecular Biology Inc
Abstract
Maintaining synaptic transmission requires replenishment of docked synaptic vesicles within the readily releasable pool (RRP) from synaptic vesicle clusters in the synapsin-bound reserve pool. We show that synapsin forms a complex with phosphatidylinositol 3-kinase (PI 3-kinase) in intact nerve terminals and that synapsin-associated kinase activity increases on depolarization. Disruption of either PI 3-kinase activity or its interaction with synapsin inhibited replenishment of the RRP, but did not affect exocytosis from the RRP. Thus we conclude that a synapsin-associated PI 3-kinase activity plays a role in synaptic vesicle delivery to the RRP. This also suggests that PI 3-kinase contributes to the maintenance of synaptic transmission during periods of high activity, indicating a possible role in synaptic plasticity.
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Keywords: Biochemistry; Complexation; Cytology; Neurology; Synapsin; Proteins; phosphatidylinositol 3 kinase; synapsin I; animal tissue; article; complex formation; depolarization; enzyme activity; exocytosis; nerve cell plasticity; nerve conduction; nerve ending;
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Journal of Biological Chemistry
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Journal article
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2037-12-31
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