Synaptic vesicles re-form rapidly after exocytosis, carrying vesicle membrane proteins that had been exposed on the cell surface by exocytosis back into the cell (Sudhoff 2004). The botulinum toxin type B disulfide bonded heavy chain - light chain heterodimer (botB HC:LC dimer) bound to ganglioside GT1b and syntagmin 1 or 2 (SYT) is inferred to be taken up as well, delivering it to the re-formed synaptic vesicle.
Südhof, TC
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