Abstract
Synaptojanin 1 is a polyphosphoinositide phosphatase concentrated in presynaptic nerve terminals, where it dephosphorylates a pool of phosphatidylinositol 4,5-bisphosphate implicated in synaptic vesicle recycling. Like other proteins with a role in endocytosis, synaptojanin 1 undergoes constitutive phosphorylation in resting synapses and stimulation-dependent dephosphorylation by calcineurin. Here, we show that cyclin-dependent kinase 5 (Cdk5) phosphorylates synaptojanin 1 and regulates its function bothin vitroand in intact synaptosomes. Cdk5 phosphorylation inhibited the inositol 5-phosphatase activity of synaptojanin 1, whereas dephosphorylation by calcineurin stimulated such activity. The activity of synaptojanin 1 was also stimulated by its interaction with endophilin 1, its major binding partner at the synapse. Notably, Cdk5 phosphorylated serine 1144, which is adjacent to the endophilin binding site. Mutation of serine 1144 to aspartic acid to mimic phosphorylation by Cdk5 inhibited the interaction of synaptojanin 1 with endophilin 1. These results suggest that Cdk5 and calcineurin may have an antagonistic role in the regulation of synaptojanin 1 recruitment and activity, and therefore in the regulation of phosphatidylinositol 4,5-bisphosphate turnover at synapses.
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Dates
Type | When |
---|---|
Created | 21 years, 7 months ago (Jan. 13, 2004, 1:28 p.m.) |
Deposited | 1 year, 7 months ago (Jan. 11, 2024, 5:09 p.m.) |
Indexed | 11 months, 1 week ago (Sept. 20, 2024, 11:37 a.m.) |
Issued | 21 years, 7 months ago (Jan. 2, 2004) |
Published | 21 years, 7 months ago (Jan. 2, 2004) |
Published Online | 21 years, 7 months ago (Jan. 2, 2004) |
Published Print | 21 years, 7 months ago (Jan. 13, 2004) |
@article{Lee_2004, title={Regulation of synaptojanin 1 by cyclin-dependent kinase 5 at synapses}, volume={101}, ISSN={1091-6490}, url={http://dx.doi.org/10.1073/pnas.0307813100}, DOI={10.1073/pnas.0307813100}, number={2}, journal={Proceedings of the National Academy of Sciences}, publisher={Proceedings of the National Academy of Sciences}, author={Lee, Sang Yoon and Wenk, Markus R. and Kim, Yong and Nairn, Angus C. and De Camilli, Pietro}, year={2004}, month=jan, pages={546–551} }