Synaptotagmin-11 inhibits spontaneous neurotransmission through vti1a

Wan Ru Li, Ya Long Wang, Chao Li, Pei Gao, Fei Fan Zhang, Meiqin Hu, Jing Chen Li, Shuli Zhang, Rena Li, Claire Xi Zhang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Recent work has revealed that spontaneous release plays critical roles in the central nervous system, but how it is regulated remains elusive. Here, we report that synaptotagmin-11 (Syt11), a Ca2+-independent Syt isoform associated with schizophrenia and Parkinson's disease, suppressed spontaneous release. Syt11-knockout hippocampal neurons showed an increased frequency of miniature excitatory post-synaptic currents while over-expression of Syt11 inversely decreased the frequency. Neither knockout nor over-expression of Syt11 affected the average amplitude, suggesting the pre-synaptic regulation of spontaneous neurotransmission by Syt11. Glutathione S-transferase pull-down, co-immunoprecipitation, and affinity-purification experiments demonstrated a direct interaction of Syt11 with vps10p-tail-interactor-1a (vti1a), a non-canonical SNARE protein that maintains spontaneous release. Importantly, knockdown of vti1a reversed the phenotype of Syt11 knockout, identifying vti1a as the main target of Syt11 inhibition. Domain analysis revealed that the C2A domain of Syt11 bound vti1a with high affinity. Consistently, expression of the C2A domain alone rescued the phenotype of elevated spontaneous release in Syt11-knockout neurons similar to the full-length protein. Altogether, our results suggest that Syt11 inhibits vti1a-containing vesicles during spontaneous release. (Figure presented.).

Original languageEnglish
Pages (from-to)729-741
Number of pages13
JournalJournal of Neurochemistry
Volume159
Issue number4
DOIs
Publication statusPublished - Nov 2021

Keywords

  • SNARE
  • spontaneous release
  • synaptotagmin
  • vti1a

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