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Target intelligence / Profile preview
Potassium channel tetramerization domain containing 5 (KCTD5)
- Target
- KCTD5
- Molecular classification
- Other (Pentameric substrate adapter protein, BTB/POZ domain-containing), E3 ligase complex adapter (functions with CUL3), Not an ion channel, enzyme, receptor, or transporter itself
01
Overview
Potassium channel tetramerization domain containing 5 (KCTD5) is a member of the BTB/POZ domain-containing protein family, structurally related to potassium channel auxiliary proteins but does not form an ion channel itself. KCTD5 assembles as a unique pentamer and acts as a substrate adapter for Cullin3-dependent E3 ubiquitin ligase complexes, particularly mediating the ubiquitination and degradation of free G protein βγ subunits released after GPCR activation. KCTD5 also regulates cell migration, focal adhesion dynamics, and cell spreading by modulating Rac1 activity and Ca2+ signaling, implicating roles in cytoskeletal rearrangement and cellular communication. The gene is associated with rare genetic disorders and its expression is linked to cytosolic protein catabolism. Structural studies show KCTD5 forms pentameric assemblies with flexible BTB and CTD domains, interacts with CUL3, and participates in formation of functional E3 ligase complexes. While it shares homology with potassium channel T1 domains, it does not interact with or affect canonical Kv channels.
- Other names
- BTB/POZ domain-containing protein KCTD5FLJ20040KCTD5
02
Mechanism of action
Not applicable as no drugs target KCTD5.
03
Biological functions
Protein-protein interaction, especially as an E3 ligase substrate adapter (CUL3)Regulation of cell migration, cell spreading, and focal adhesion dynamics via modulation of Rac1 activity and Ca2+ signalingUbiquitination and degradation of free G protein βγ (Gβγ) subunitsPossibly interacts with Golgi stacking proteinsProteasome-mediated ubiquitin-dependent protein catabolic process
04
Disease associations
Probable genetic link to Scalp-Ear-Nipple SyndromeProgressive myoclonus epilepsyInvestigation in cell migration/cancer biology, but no direct established disease mechanism to dateNo strong links to inflammation, neurodegeneration, cardiovascular disease, or infection reported
05
Safety considerations
No specific safety concerns or therapeutic challenges described, as KCTD5 is not a direct therapeutic target.
06
Interacting drugs
No drugs are known to specifically interact with KCTD5
07
Biomarkers
None established for patient selection or monitoring efficacy.
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