Acts as a gating modifier on both Kv and Nav ion channels. Voltage-dependently inhibits voltage-gated potassium channels Kv3 (Kv3.1/KCNC1, Kv3.2/KCNC2 and Kv3.4/KCNC4) (PubMed:9506974, PubMed:16177043). Slows inactivation of the voltage-gated sodium channel Nav1.7/SCN9A (By similarity). Inhibits all Kv3.1, Kv3.2 and Kv3.4 by about 50% when tested at a voltage of +40 mV (PubMed:16177043). May act by binding residues in voltage-sensing domains S3b and S4 of Kv3 (PubMed:16177043). Tests have been done on human Nav1.7/SCN9A and rat SCG neurons that mostly carry Nav1.7 channels (EC(50)=300 nM) (By similarity). This toxin also reduces blood pressure (Ref.1). Belongs to the sea anemone type 3 (BDS) potassium channel toxin family. Opinions are divided on whether Anemonia viridis (Forsskal, 1775) and Anemonia sulcata (Pennant, 1777) are separate species.