| Purpose | Conantokin G inhibits NMDA receptors | 
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
                                                                                    | Sequence | Gly-Glu-Gla-Gla-Leu-Gln-Gla-Asn-Gln-Gla-Leu-Ile-Arg-Gla-Lys-Ser-Asn-NH2 | 
                                                                                                                                                                                                                                                                                                                                                                                                                                                    
                                                                                    | Specificity | Conantokin G has been isolated from the venom of the cone Conus geographus. This toxin selectively inhibits NR2B subunits of N-methyl-D-aspartate (NMDA) receptor-mediated calcium influx in central nervous system neurons. Conantokin G induces sleep-like symptoms in young mice and hyperactivity in older mice (SERT). |