Single-molecule FRET studies have resulted in an experimentally derived model of a synaptotagmin–SNARE complex. In this complex of SNARE with synaptotagmin 1, the arrangement of the Ca2+-binding loops is similar to that of the structure of SNARE-induced Ca2+-bound synaptotagmin 3. This suggests a common molecular mechanism by which the synaptotagmin–SNARE interaction plays a role in Ca2+-triggered vesicle fusion.
- Ucheor B Choi
- Pavel Strop
- Keith R Weninger