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Published online 17 November 2003. doi:10.1083/jcb.200308110
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© The Rockefeller University Press, 0021-9525/2003/11/813 $8.00
The Journal of Cell Biology, Volume 163, Number 4, 813-824


Article

Cophosphorylation of amphiphysin I and dynamin I by Cdk5 regulates clathrin-mediated endocytosis of synaptic vesicles

Kazuhito Tomizawa1, Satoshi Sunada1, Yun-Fei Lu7, Yoshiya Oda4, Masahiro Kinuta2, Toshio Ohshima5, Taro Saito6, Fan-Yan Wei1, Masayuki Matsushita1, Sheng-Tian Li1, Kimiko Tsutsui3, Shin-ichi Hisanaga6, Katsuhiko Mikoshiba5, Kohji Takei2 and Hideki Matsui1,7

1 Department of Physiology, Okayama University Graduate School of Medicine and Dentistry, Okayama 700-8558, Japan
2 Department of Neuroscience, Okayama University Graduate School of Medicine and Dentistry, Okayama 700-8558, Japan
3 Department of Neuroanatomy, Okayama University Graduate School of Medicine and Dentistry, Okayama 700-8558, Japan
4 Laboratory of Seeds Finding Technology, Eisai Co., Ltd., Ibaraki 300-2635, Japan
5 Laboratory for Developmental Neurobiology, Brain Science Institute, RIKEN, Saitama 351-0198, Japan
6 Department of Biological Sciences, Graduate School of Science, Tokyo Metropolitan University, Tokyo 192-0397, Japan
7 Protein Therapy, New Techno-Venture Oriented R&D, Japan Science and Technology Corporation, Okayama 700-8558, Japan

Address correspondence to Kazuhito Tomizawa, Department of Physiology, Okayama University Graduate School of Medicine and Dentistry, Shikata-cho 2-5-1, Okayama 700-8558, Japan. Tel.: 81-86-235-7109. Fax: 81-86-235-7111. email: tomikt{at}md.okayama-u.ac.jp

It has been thought that clathrin-mediated endocytosis is regulated by phosphorylation and dephosphorylation of many endocytic proteins, including amphiphysin I and dynamin I. Here, we show that Cdk5/p35-dependent cophosphorylation of amphiphysin I and dynamin I plays a critical role in such processes. Cdk5 inhibitors enhanced the electric stimulation–induced endocytosis in hippocampal neurons, and the endocytosis was also enhanced in the neurons of p35-deficient mice. Cdk5 phosphorylated the proline-rich domain of both amphiphysin I and dynamin I in vitro and in vivo. Cdk5-dependent phosphorylation of amphiphysin I inhibited the association with ß-adaptin. Furthermore, the phosphorylation of dynamin I blocked its binding to amphiphysin I. The phosphorylation of each protein reduced the copolymerization into a ring formation in a cell-free system. Moreover, the phosphorylation of both proteins completely disrupted the copolymerization into a ring formation. Finally, phosphorylation of both proteins was undetectable in p35-deficient mice.

Key Words: endocytic protein; p35; cyclin-dependent kinase; presynapse; synaptosome


The online version of this article includes supplemental material.

Abbreviations used in this paper: DLS, dynamic light scattering; ESI, electrospray ionization; LC, liquid chromatography; MALDI-MS, matrix assisted laser desorption/ionization mass spectrometry; PRD, proline-rich domain; SH3, Src homology 3; VDCC, voltage-dependent calcium channel.


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