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Potassium voltage-gated channel subfamily A regulatory beta subunit 3 (KCNAB3)
- Target
- KCNAB3
- Molecular classification
- Ion channel (regulatory subunit), Potassium channel, voltage-gated, shaker-related subfamily, Aldo-keto reductase
01
Overview
Potassium voltage-gated channel subfamily A regulatory beta subunit 3 (KCNAB3) encodes an auxiliary beta subunit protein that regulates the function of potassium channels of the shaker-related (Kv1.X) family. KCNAB3 forms heterodimers with alpha subunits (notably KCNA5/Kv1.5), modulating channel inactivation and kinetics, and possibly influencing cardiac and neuronal excitability. KCNAB3 is implicated in primary electrical heart disease, with loss-of-function mutations linked to arrhythmias and sudden cardiac death, and it may also have roles in the central nervous system and neurodegenerative diseases. The protein may display NADPH-dependent aldo-keto reductase activity, suggesting additional roles in redox regulation[1][2][3][4][5][7][9].
- Other names
- Voltage-gated potassium channel subunit beta-3KCNA3BAKR6A9Kv-beta-3KCNA3.1BKV-BETA-3
02
Mechanism of action
Modulation of channel activity via auxiliary beta subunit effect on alpha Kv1.X subunits; Regulation of Kv1.5 (KCNA5)-containing channel inactivation
03
Biological functions
Modulation of voltage-gated potassium channel activityRegulation of potassium ion transportChannel inactivation kineticsPossible NADPH-dependent aldoketoreductase activity
04
Disease associations
Cardiovascular disease (sudden cardiac death, arrhythmia)Epilepsy and febrile seizuresReported expression and RNA changes in neurodegenerative diseases (e.g., Alzheimer's disease)
05
Safety considerations
Loss-of-function mutations may cause arrhythmias or sudden cardiac deathVariants may alter neuronal excitability (risk for seizures)
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