Potassium channel toxin alpha-KTx 6.1

UniProtKB accession:  Q10726

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UniProtKB description:  Potently and reversibly inhibits the insect voltage-gated Shaker (Sh) potassium channel (isoform alpha (B)), the mammalian voltage-gated potassium channels Kv1.2/KCNA2 (IC(50)=0.44 nM), and the calcium-activated potassium channel KCa2.3/KCNN3 (Kd=330 nM) (PubMed:10931199, PubMed:11527975, PubMed:9001397). Its effect on Kv1.3/KCNA3 is controversial, since this channel is voltage-independently inhibited in PubMed:9464266, but is not affected in PubMed:10931199. Furthermore, this toxin competes with apamin (a small conductance calcium-activated potassium channel inhibitor) for binding to rat brain synaptosomes.