Inhibits voltage-gated potassium channels (Kv) with higher potency for Kv1.1/KCNA1 and Kv1.3/KCNA3. In PubMed:21339955, this protein is called kappa-TLTX-Hh1a. The TATX abbreviation is given to this protein, since the abbreviation TLTX was already given to a spider family. Belongs to the sea anemone type 1 potassium channel toxin family. Type 1a subfamily.