Potassium channel tetramerization domain containing 8 (KCTD8)

Potassium channel tetramerization domain containing 8 (KCTD8) is a BTB/POZ domain-containing protein that serves as an auxiliary subunit of the GABA-B receptor complex. Its primary function is to regulate the pharmacology, kinetics, and G-protein signaling of GABA-B receptors, thereby influencing agonist potency and receptor desensitization. KCTD8 is not a potassium channel itself but derives its name from sequence similarity to the tetramerization domain of voltage-gated potassium channels. Mutations or dysfunction in KCTD8 have been implicated in rare genetic disorders, such as Epilepsy and Scalp-Ear-Nipple Syndrome, and may play broader roles in nervous system modulation through effects on GABAergic signaling. No drugs currently target KCTD8 directly, but its presence modifies the functional response to GABA-B receptor ligands such as baclofen[3][7][10].

Other names

KCTD8BTB/POZ domain-containing protein KCTD8Potassium channel tetramerisation domain containing 8

As an auxiliary subunit, KCTD8 modulates GABA-B receptor function: Alters pharmacology and kinetics of receptor response[3][5][10][9]; Increases agonist potency; Promotes rapid onset and desensitization of receptor signaling[10]. No direct ligand/drug mechanism for KCTD8 as a standalone entity.