Abstract
Synaptic vesicle endocytosis (SVE) is triggered by calcineurin-mediated dephosphorylation of the dephosphin proteins. SVE is maintained by the subsequent rephosphorylation of the dephosphins by unidentified protein kinases. Here, we show that cyclin-dependent kinase 5 (Cdk5) phosphorylates dynamin I on Ser 774 and Ser 778 in vitro, which are identical to its endogenous phosphorylation sites in vivo. Cdk5 antagonists and expression of dominant-negative Cdk5 block phosphorylation of dynamin I, but not of amphiphysin or AP180, in nerve terminals and inhibit SVE. Thus Cdk5 has an essential role in SVE and is the first dephosphin kinase identified in nerve terminals.
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Acknowledgements
This work was supported by grants from the Australian National Health and Medical Research Council (NHMRC to P.J.R.), the Cunningham Trust and Wellcome Trust (M.A.C.) and the Danish Natural Science Research Council (M.R.L.). We thank P. Rowe for critical reading of the manuscript. We also thank A. Quan (Children's Medical Research Institute), B. Hanna (Children's Medical Research Institute) and L. Deer (Institute of Clinical Pathology and Medical Research, Westmead Hospital) for valuable technical assistance. In addition, we also thank our colleagues listed in the constructs section for the plasmids required for this project.
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Supplementary information
Supplementary Information Fig. S1-S6
Supplementary Information Fig. S1a: Effect of cdk5 phosphorylation on dynamin's GTPase activity. (PDF 1528 kb)
Supplementary Information Fig. S2: Roscovitine inhibits dynamin I phosphorylation by cdk5 but not by PKC-α in vitro. is presented. Arrows indicate either dynamin I (Dyn) or synapsin I (Syn, doublet).
Supplementary Information Fig. S3: Lack of effect of PD 98059 on dynamin I phosphorylation and SVE.
Supplementary Information Fig. S4: Double pull-down of 4 dephosphins and synapsin from synaptosomes.
Supplementary Information Fig. S5; Morphology of synaptosomes at rest or after two cycles of stimulus- recovery.
Supplementary Information Fig. S6: Morphology of synaptosomes during S2 in the presence of roscovitine.
Supplementary Information Methods
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Tan, T., Valova, V., Malladi, C. et al. Cdk5 is essential for synaptic vesicle endocytosis. Nat Cell Biol 5, 701–710 (2003). https://doi.org/10.1038/ncb1020
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DOI: https://doi.org/10.1038/ncb1020
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