生物行移动版

The synaptic vesicle protein synaptobrevin is a crucial component of the vesicle release machinery, working alongside its plasma membrane partners syntaxin and SNAP-25. Deak et al. investigated the structural requirements of synaptobrevin function by using engineered constructs to restore release in hippocampal neurons derived from synaptobrevin-deficient mice. Cellubrevin, which possesses divergent N- and C-terminal domains but shares a nearly identical central SNARE motif with synaptobrevin, was able to rescue transmission. An electrostatic interaction between arginine (R) and glutamine (Q) in the 'zero layer' of each SNARE was not essential, as an R-Q substitution in synaptobrevin facilitated both evoked and spontaneous release. However, the spacing between the SNARE motif and the C-terminal transmembrane domain was crucial. Synaptobrevin with a 12-residue insertion between the SNARE motif and the transmembrane region provided only partial rescue, and synaptobrevin with a 24-residue insertion failed to rescue any function.