Inhibits voltage-gated potassium channels (Kv1/KCNA) (PubMed:16905168). Blocks the binding of dendrotoxin to rat synaptosomal membrane in a dose-dependent manner (IC(50)=91 nM) (PubMed:16905168). Inhibits Kv1.1/KCNA1 and Kv1.3/KCNA3 with high potency (By similarity). Belongs to the sea anemone type 1 potassium channel toxin family. Type 1a subfamily.