The 26-mer peptide released from SNAP-25 cleavage by botulinum neurotoxin E inhibits vesicle docking.
Ferrer-Montiel AV, Gutierrez LM, Apland JP, Canaves JM, Gil A, Viniegra S, Biser JA, Adler M, Montal M, FEBS Lett, 1998 Sep 11 - link

A peptide that mimics the C-terminal sequence of SNAP-25 inhibits secretory vesicle docking in chromaffin cells.
Gutierrez LM, Viniegra S, Rueda J, Ferrer-Montiel AV, Canaves JM, Montal M, J Biol Chem, 1997 Jan 31 - link