Ganglioside co-receptor

Ganglioside co-receptors are sialic acid-containing glycosphingolipids, such as GT1b, GD1a, and GD1b, that are highly enriched on the presynaptic membranes of cholinergic nerve terminals (Rummel, 2016). They are essential components of the "double-receptor" model, which facilitates the high-affinity binding and subsequent internalization of Botulinum neurotoxins (BoNTs) and Tetanus toxin (TeNT) (Pirazzini et al., 2017). By acting as initial attachment sites, these gangliosides concentrate toxins on the neuronal surface, allowing them to interact with specific protein receptors like Synaptotagmin or Synaptic Vesicle Protein 2 (SV2) for endocytosis (Dong et al., 2006). Beyond toxin entry, these molecules are involved in modulating neuronal excitability and maintaining synaptic stability through interactions with membrane proteins and ion channels (Schengrund, 2015). In autoimmune diseases such as Guillain-Barré syndrome and Miller Fisher syndrome, these gangliosides become targets for pathogenic autoantibodies, leading to complement-mediated damage at the neuromuscular junction (Willison & Yuki, 2002). Therapeutically, the interaction between BoNTs and these gangliosides is exploited in the treatment of muscle spasticity and dystonia, where the toxin's entry is dependent on ganglioside presence (Rossetto et al., 2014).

Other names

Sialic acid-containing glycosphingolipidsPresynaptic gangliosidesBotulinum toxin co-receptorsGT1bGD1aGD1bGM1GQ1b

Facilitates the dual-receptor mediated endocytosis of neurotoxins into presynaptic terminals and serves as a binding site for pathogenic autoantibodies.