HsTx1 is a member of the a-KTx6 family of toxins active on voltage-gated K+ v1.3 channels (Kd close to 10 pM). It is also very active on Kv1.2 channels (Kd around 7 nM). It is however inactive on apamin-sensitive SK channels. It is one of the most potent toxins active on K channels.
Peptides & proteins
Savarin, P., et al. (1999) Protein Sci; Lebrun, B., (1997) Biochem