Potassium channel tetramerization domain-containing protein 1 (KCTD1)

Potassium channel tetramerization domain-containing protein 1 (**KCTD1**) is a member of the KCTD protein family, which share structural similarity to the tetramerization (T1/BTB) domain of voltage-gated potassium channels but do not function as ion channels themselves[1][3][6]. KCTD1 contains a conserved N-terminal BTB (POZ) domain that mediates protein-protein interactions and oligomerization, most commonly pentamerization[3][6]. The primary functional role of KCTD1—and related family members—involves acting as an adaptor or scaffold, particularly in recruiting substrate proteins for cullin 3 (Cul3) ubiquitin ligase complexes, thereby regulating ubiquitination, proteasomal degradation, and thus cell signaling[1][3]. KCTD1 is essential for neural development and ectodermal/crest cell function, and its mutations can cause congenital malformations such as scalp defects (aplasia cutis)[5][6]. While its precise physiological and pathological mechanisms are still being elucidated, there is currently no evidence that KCTD1 is a direct therapeutic target, nor are there established small-molecule modulators or clinical biomarkers related to its activity[1][6]. Key points: - **Not a classic receptor, enzyme, or channel**—functions as a modulatory scaffold protein via its BTB domain[1][3][6]. - **Regulates protein ubiquitination/degradation** through the cullin 3 ligase complex[1][3]. - **Involved in neurodevelopmental processes** and genetic disorders when mutated[5][6]. - **No known direct-interacting drugs or reported safety concerns**; not currently a drug target. Primary source support: [1][3][5][6].

Other names

BTB/POZ domain-containing protein KCTD1C18orf5KCTD1Potassium channel tetramerization domain-containing protein 1