Neuronal surface dual receptor complex

The neuronal surface dual receptor complex is a specialized molecular assembly on the presynaptic membrane of neurons that serves as the high-affinity docking site for botulinum neurotoxins (BoNTs). This complex is characterized by the synergistic interaction between two distinct components: a polysialoganglioside (such as GT1b or GD1a) and a specific protein receptor, typically Synaptic Vesicle Glycoprotein 2 (SV2) or Synaptotagmin (Syt I/II). The dual-receptor mechanism is essential for the extraordinary potency and cell-type specificity of BoNTs, as the ganglioside provides initial surface tethering while the protein receptor mediates high-affinity binding and subsequent internalization through the synaptic vesicle recycling pathway. Once internalized, the toxin's catalytic light chain is released into the cytosol to cleave SNARE proteins, effectively blocking the release of neurotransmitters like acetylcholine and causing localized muscle paralysis. Beyond its role in botulism pathogenesis, this complex is a major therapeutic target for treating conditions such as cervical dystonia, spasticity, and chronic migraine using various botulinum toxin formulations. Additionally, the protein components of the complex, particularly SV2A, are targeted by anti-epileptic drugs like levetiracetam, highlighting the complex's broader importance in regulating synaptic transmission and its potential for novel drug delivery strategies.

Other names

Botulinum neurotoxin receptor complexGanglioside-protein receptor complexDual-receptor complex for BoNTSV2-ganglioside complexSynaptotagmin-ganglioside complex