Potently blocks Kv1.1/KCNA1 (85%), Kv1.2/KCNA2 (91%), Kv1.3/KCNA3 (89%), Kv1.6/KCNA6 (94%), and Shaker (97%). Expressed by the venom gland. Has the structural arrangement of an alpha-helix connected to a beta-sheet by disulfide bonds (CSalpha/beta). Inhibits with low efficiency Kv1.5/KCNA5, Kv2.1/KCNB1, Kv7.1/KCNQ1 and ERG/KCNH2. Does not inhibit Kv1.4/KCNA4, Kv3.1/KCNC1, Kv7.2/KCNQ2 and ERG1/Kv11.1/KCNH2. Unexpectandly, the 3D-structure model presents a toxin with only two disulfide bonds instead of the three normally found in this toxin family. Belongs to the short scorpion toxin superfamily. Potassium channel inhibitor family. Alpha-KTx 04 subfamily.