John R. Barr*
, Hercules Moura*, Anne E. Boyer*, Adrian R. Woolfitt*, Suzanne R. Kalb*, Antonis Pavlopoulos*, Lisa G. McWilliams†, Jurgen G. Schmidt‡, Rodolfo A. Martinez‡, and David C. Ashley*
Figure 2. Substrate peptide sequences, the botulinum neurotoxin (BoNT) serotype predicted cleavage product sequences, and masses of the substrate and product peptides. Peptides for BoNT-A and -E were derived from the human SNAP (synaptosomal-associated protein)-25 protein. The substrate peptide for BoNT A, 187-SNKTRIDEANQRATKML-203, was modified to biotin(ε)-KG(K189->R and K201->R)GGK-(ε)Biotin. The BoNT-E substrate sequence was also from human SNAP-25 (156–186). Substrate peptides for BoNT-B and -F are from human synaptobrevin 2; the BoNT-B substrate (3) is from 59–93 in the sequence and the BoNT-F substrate is from 35–74.