Potassium voltage-gated channel subfamily A (Kv1) (Kv1)

The Shaker voltage-gated potassium channel is the prototypical member of the Kv channel superfamily, originally identified in Drosophila and represented in humans by the Kv1 (KCNA) family (UniProt: P14625). These channels are essential for regulating cellular excitability by mediating the selective efflux of potassium ions in response to membrane depolarization, which facilitates the repolarization phase of action potentials (StatPearls: NBK563122). The Shaker-IR variant refers to an Inactivation Removed mutant used extensively in research to study pore kinetics without the interference of fast N-type inactivation (PMID: 24828641). In humans, Kv1 channels are critical for axonal conduction in the nervous system and for the activation of effector memory T cells, specifically the Kv1.3 isoform. Mutations in these channels are linked to disorders such as episodic ataxia type 1 and myokymia, while their pharmacological blockade by drugs like dalfampridine is used to improve walking in patients with multiple sclerosis by enhancing conduction in demyelinated axons (PubMed: 20695026).

Other names

Shaker-related potassium channelKCNA familyShaker-IR (Inactivation Removed)Voltage-gated potassium channel subunit Kv1Shaker-type potassium channel

Blockade of the ion-conducting pore to prevent potassium efflux, thereby prolonging action potentials and enhancing synaptic transmission or modulating immune cell activation.