Depressant insect beta-toxins cause a transient contraction paralysis followed by a slow flaccid paralysis. They bind voltage-independently at site-4 of sodium channels (Nav) and block action potentials, primarily by depolarizing the axonal membrane and suppressing the sodium current. This depressant toxin is active only on insects. It is found in a relatively small amount in the venom, and its activity on insects is 10-fold higher compared to other known depressant toxins