Voltage-gated potassium channel (Squid giant axon) (Kv channel)

The voltage-gated potassium channel of the squid giant axon is a foundational transmembrane protein in neurobiology, first described by Hodgkin and Huxley in 1952 to explain the ionic basis of the action potential (PubMed: 12978132). It functions as a delayed rectifier, opening in response to membrane depolarization to allow the rapid efflux of potassium ions, which facilitates the repolarization of the neuronal membrane. While this specific channel is derived from the squid (Doryteuthis pealeii), it serves as the primary structural and functional model for the human Kv1 (Shaker-related) family of channels (UniProt: P22455). In humans, homologous channels are critical therapeutic targets for managing neuronal excitability in conditions such as epilepsy, multiple sclerosis, and episodic ataxia. Pharmacological agents like tetraethylammonium (TEA) and 4-aminopyridine (4-AP) are classic inhibitors used to block the channel pore or modulate gating kinetics (PubChem: CID 5413). Understanding this channel's mechanism is essential for developing drugs that can selectively modulate potassium conductance to treat various channelopathies and cardiac arrhythmias (NIH: StatPearls - Physiology, Potassium Channels).

Other names

Delayed rectifier potassium channelSquid Kv1 channelSqKv1Voltage-dependent potassium channel

Blockade of the ion-conducting pore or modulation of the potassium channel gating to inhibit ion efflux.