Functionally and spatially distinct modes of munc18-syntaxin 1 interaction

Colin Rickman, Claire N Medine, Axel Bergmann, Rory R Duncan

Research output: Contribution to journalArticle

98 Citations (Scopus)

Abstract

Eukaryotic membrane trafficking is a conserved process under tight temporal and spatial regulation in which the fusion of membranes is driven by the formation of the ternary SNARE complex. Syntaxin 1a, a core component of the exocytic SNARE complex in neurons and neuroendocrine cells, is regulated directly by munc18-1, its cognate Sec1p/munc18 (SM) protein. SM proteins show remarkable structural conservation throughout evolution, indicating a common binding mechanism and function. However, SM proteins possess disparate binding mechanisms and regulatory effects with munc18-1, the major brain isoform, classed as atypical in both its binding specificity and its mode. We now show that munc18-1 interacts with syntaxin 1a through two mechanistically distinct modes of binding, both in vitro and in living cells, in contrast to current models. Furthermore, these functionally divergent interactions occur at distinct cellular locations. These findings provide a molecular explanation for the multiple, spatially distinct roles of munc18-1.
Original languageEnglish
Pages (from-to)12097-12103
Number of pages7
JournalJournal of Biological Chemistry
Volume282
Issue number16
DOIs
Publication statusPublished - 20 Apr 2007

Keywords

  • Amino Acid Sequence
  • Brain
  • Humans
  • Microscopy, Confocal
  • Molecular Sequence Data
  • Munc18 Proteins
  • Neurons
  • Protein Binding
  • Protein Interaction Mapping
  • Protein Isoforms
  • Protein Structure, Tertiary
  • Sequence Homology, Amino Acid
  • Syntaxin 1
  • Time Factors
  • Vesicular Transport Proteins

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