Synaptotagmin-1 aggregates membranes in response to Ca2+. Using a variety of approaches, it was discovered that synaptotagmin-mediated membrane aggregation occurs through trans interactions between synaptotagmin molecules bound to different membranes. Synaptotagmin-regulated, SNARE-catalyzed fusion further requires synaptotagmin to drive the assembly of nonfusogenic syntaxin and SNAP25 into fusion-competent t-SNARE heterodimers.
- Enfu Hui
- Jon D Gaffaney
- Edwin R Chapman