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Clostridium neurotoxin, C-terminal receptor binding The Clostridium neurotoxin family is composed of tetanus neurotoxins and seven serotypes of botulinum neurotoxin. The structure of the botulinum neurotoxin reveals a four domain protein. The N-terminal catalytic domain (pfam01742), the central translocation domains and two receptor binding domains. This domains is the C-terminal receptor binding domain, which adopts a modified beta-trefoil fold with a six stranded beta-barrel and a beta-hairpin triplet capping the domain. The first step in the intoxication process is a binding event between this domains and the pre-synaptic nerve ending.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",