Formation of a yeast SNARE complex is accompanied by significant structural changes

Luke M. Rice, Patrick Brennwald, Axel T. Brünger

Research output: Contribution to journalArticle

58 Scopus citations

Abstract

The evolutionarily conserved SNARE (SNAP receptor) proteins and their complexes are key players in the docking and fusion of secretory vesicles with their target membrane. Biophysical techniques were used to characterize structural and energetic properties of the cytoplasmic domains of the yeast SNAREs Snc1 and Ssol, of the SNAP-25-like domain of Sec9, and of the Sso1:Sec9 and Sso1:Sec9:Snc1 complexes. Individually, all three SNAREs are monomeric; Ssol shows significant secondary structure while Snc1 and Sec9 are largely unstructured. Ternary SNARE complex formation (K(D)< 50 nM) is accompanied by a more than two-fold increase in secondary structure. This binding induced structure, the large increase in thermal stability, and the self-association of the ternary complex represent conserved properties of SNAREs that are probably important in vesicle docking and fusion.

Original languageEnglish (US)
Pages (from-to)49-55
Number of pages7
JournalFEBS Letters
Volume415
Issue number1
DOIs
StatePublished - Sep 22 1997

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Keywords

  • Circular dichroism
  • Exocytosis
  • Fusion
  • Structural change
  • Yeast

ASJC Scopus subject areas

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Genetics
  • Cell Biology

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