Potassium voltage-gated channel subfamily C member 3 (Kv3.3) (Kv3.3)

The Potassium voltage-gated channel subfamily C member 3 (Kv3.3) is a transmembrane protein encoded by the KCNC3 gene, playing a critical role in the repolarization of action potentials in high-frequency firing neurons (UniProt: P48548). Predominantly expressed in the cerebellum, particularly in Purkinje cells, and the auditory brainstem, Kv3.3 exhibits unique fast-opening and closing kinetics at relatively positive membrane potentials (NCBI Gene: 3748). These characteristics enable neurons to sustain high-speed signaling essential for motor coordination and sensory processing (PubMed: 23576631). Mutations in the KCNC3 gene are directly linked to Spinocerebellar Ataxia Type 13 (SCA13), a condition marked by progressive cerebellar degeneration and motor impairment (PubMed: 16415881). Therapeutic interest in Kv3.3 focuses on small-molecule modulators, such as positive allosteric modulators (PAMs), which aim to restore normal firing patterns in diseased states (Autifony Therapeutics). While non-selective blockers like 4-aminopyridine and tetraethylammonium interact with the channel, current drug development efforts prioritize selective agents to minimize off-target effects and potential seizure risks.

Other names

KCNC3Shaw-related subfamily member 3SCA13Voltage-gated potassium channel subunit Kv3.3

Positive allosteric modulation