Synaptotagmin is an inositol polyphosphate binding protein: Isolation and characterization as an ins 1,3,4,5-P4 binding protein

Michio Niinobe, Yoshihide Yamaguchi, Mitsunori Fukuda, Katsuhiko Mikoshiba

研究成果: Article査読

59 被引用数 (Scopus)

抄録

We isolated a binding protein for inositol 1,3,4,5-tetrakisphosphate (InsP4) from detergent-solubilized mouse cerebellar membrane fractions by sequential column chromatographies. Partial amino acid sequencing of the purified sample revealed that the protein is essentially identical to rat synaptotagmin II, an integral membrane protein of synaptic vesicles. Immunoprecipitation experiment of [3H]lnsP4 binding activity of the purified protein using polyclonal antibody against the C2A domain of rat synaptotagmin II also revealed that mouse synaptotagmin II is the InsP4 binding protein (IP4BP). Scatchard analysis of InsP4 binding to the IP4BP/synaptotagmin indicates a single binding site with a Kd of 30 nM. The present finding that InsP4 binds strongly to synaptotagmin II suggests an important role for inositol polyphosphates in the regulation of neurotransmitter release.

本文言語English
ページ(範囲)1036-1042
ページ数7
ジャーナルBiochemical and biophysical research communications
205
2
DOI
出版ステータスPublished - 1994 12 15
外部発表はい

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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