Interactions within the yeast t-SNARE Sso1p that control SNARE complex assembly

M. Munson, X. Chen, A. E. Cocina, S. M. Schultz, F. M. Hughson

Research output: Contribution to journalArticlepeer-review

134 Scopus citations


In the eukaryotic secretory and endocytic pathways, transport vesicles shuttle cargo among intracellular organelles and to and from the plasma membrane. Cargo delivery entails fusion of the transport vesicle with its target, a process thought to be mediated by membrane bridging SNARE protein complexes. Temporal and spatial control of intracellular trafficking depends in part on regulating the assembly of these complexes. In vitro, SNARE assembly is inhibited by the closed conformation adopted by the syntaxin family of SNAREs. To visualize this closed conformation directly, the X-ray crystal structure of a yeast syntaxin, Sso1p, has been determined and refined to 2.1 Å resolution. Mutants designed to destabilize the closed conformation exhibit accelerated rates of SNARE assembly. Our results provide insight into the mechanism of SNARE assembly and its intramolecular and intermolecular regulation.

Original languageEnglish (US)
Pages (from-to)894-902
Number of pages9
JournalNature Structural Biology
Issue number10
StatePublished - 2000

All Science Journal Classification (ASJC) codes

  • Genetics
  • Structural Biology
  • Biochemistry


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