Full Name: Botulinum neurotoxin type B light chain
Synonyms: BoNT/B LC
Botulinum neurotoxin B light chain is a zinc metalloprotease catalytic domain synthesized by Clostridium botulinum. It selectively cleaves vesicle-associated membrane protein 2 (VAMP-2/synaptobrevin), blocking synaptic vesicle fusion and neurotransmitter release to cause muscle paralysis. Its structure features a conserved zinc catalytic site.