| KCNA10 Protein |
|---|
| Protein Name | Potassium voltage-gated channel subfamily A member 10 |
| Gene | [KCNA10](/genes/kcna10) |
| Category | Protein |
| Path | /proteins/kcna10-protein |
| UniProt ID | P16389 |
| Protein Family | Voltage-gated potassium channel (Kv1) |
KCNA10 (Potassium Voltage-Gated Channel Subfamily A Member 10) is a voltage-gated potassium channel protein that plays essential roles in neuronal excitability, cardiac function, and cellular repolarization. This channel belongs to the Shaker-like Kv1 family, characterized by six transmembrane domains and a pore-forming region. KCNA10 is unique among neuronal potassium channels due to its functional expression in both neuronal and cardiac tissues, making it particularly relevant for understanding excitability disorders.
KCNA10 forms homomeric or heteromeric voltage-gated potassium channels that:
- Mediate fast repolarization: Enable rapid potassium efflux during action potential repolarization
- Set resting membrane potential: Contribute to establishing negative resting membrane potentials
- Regulate firing frequency: Control neuronal firing rates through afterhyperpolarization
- Shape action potential: Influence action potential duration and waveform
In neurons, KCNA10 contributes to:
In cardiac tissue:
- Contributes to ventricular repolarization
- Helps prevent early afterdepolarizations
- Protects against certain arrhythmias
KCNA10 channel activity is modulated by:
- Voltage: Classical voltage-dependent activation
- Phosphorylation: PKA and PKC-mediated modulation
- Protein interactions: Association with Kv beta subunits and other regulatory proteins
- Cellular signaling: Modulation by second messenger systems
Dysregulation of KCNA10 is implicated in:
- Epilepsy: Altered Kv1 channel function affects neuronal excitability thresholds
- Migraine: Vascular potassium channels may influence cortical spreading depression
- Neuropathic pain: KCNA10 in nociceptors modulates pain signaling
- Parkinson's Disease: Possible involvement in basal ganglia excitability
- Cardiac arrhythmias: KCNA10 variants may contribute to long QT syndrome
- Atrial fibrillation: Altered atrial repolarization
- Heart failure: Dysregulation of cardiac excitability
KCNA10 contains the canonical Kv channel architecture:
TMD1 - TMD2 - TMD3 - Pore - TMD4 - TMD5 - TMD6
Each subunit features:
- Voltage sensor (TMD4)
- Pore domain (H5/P-loop)
- Tetrahedral assembly (4 subunits per channel)
KCNA10 interacts with key cellular signaling systems:
KCNA10 interacts with:
- KCNA1 - Kv1.1 channel
- KCNA2 - Kv1.2 channel
- KCNB1 - Kv beta1 subunit
- DPP6 - Dipeptidyl peptidase-like protein
KCNA10 represents a potential therapeutic target for:
- Antiepileptic drugs: Kv1 channel openers
- Antiarrhythmic agents: Class III antiarrhythmics
- Analgesics: Nociceptor-targeting potassium channel modulators
Current research focuses on:
- Developing subtype-selective Kv1 channel modulators
- Understanding KCNA10-specific physiological roles
- Exploring gene therapy approaches for channelopathies
- Gutman et al., International Union of Pharmacology (2005)
- Coetzee et al., Molecular diversity of K+ channels (1999)
- Trimmer & Rhodes, Heteromultimeric K+ channels (2004)
- Shieh et al., Voltage-gated K+ channels (2000)