Purity > 90% as determined by SDS-PAGE. MW: 23.6kDa. Partial: 20-85aa. N-terminal 6xHis-SUMO-tagged. Centruroides suffusus suffusus (Mexican scorpion). Beta toxins bind voltage-independently at site-4 of sodium channels (Nav) and shift the voltage of activation toward more negative potentials thereby affecting sodium channel activation and promoting spontaneous and repetitive firing. This toxin is active only on mammals.