Involvement of Ca2+ channel synprint site in synaptic vesicle endocytosis

Hiroyasu Watanabe, Takayuki Yamashita, Naoto Saitoh, Shigeki Kiyonaka, Akihiro Iwamatsu, Kevin P. Campbell, Yasuo Mori, Tomoyuki Takahashi

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

The synaptic protein interaction (synprint) site of the voltage-gated Ca2+channel (VGCC) α1 subunit can interact with proteins involved in exocytosis, and it is therefore thought to be essential for exocytosis of synaptic vesicles. Here we report that the synprint site can also directly bind the μ subunit of AP-2, an adaptor protein for clathrin-mediated endocytosis, in competition with the synaptotagmin 1 (Syt 1) C2B domain. In brain lysates, the AP-2-synprint interaction occurred over a wide range of Ca2+ concentrations but was inhibited at high Ca2+ concentrations, in which Syt 1 interacted with synprint site. At the calyx of Held synapse in rat brainstem slices, direct presynaptic loading of the synprint fragment peptide blocked endocytic, but not exocytic, membrane capacitance changes. We propose that the VGCC synprint site is involved in synaptic vesicle endocytosis, rather than exocytosis, in the nerve terminal, via Ca 2+-dependent interactions with AP-2 and Syt.

Original languageEnglish
Pages (from-to)655-660
Number of pages6
JournalJournal of Neuroscience
Volume30
Issue number2
DOIs
Publication statusPublished - 13-01-2010
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)

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