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Potassium Channel Protein Kir3.x Subunit (IKACh) (IKACh)
- Target
- IKACh
- Molecular classification
- Ion channel, Potassium channel, Inwardly rectifying potassium channel, G protein-gated ion channel
01
Overview
The potassium channel protein Kir3.x subunit, also known as IKACh, is part of the G protein-gated inwardly rectifying potassium (GIRK) channel family. These channels are crucial regulators of cellular excitability in both the heart and nervous system. Functional channels are tetramers formed by combinations of Kir3.1, Kir3.2, Kir3.3, and Kir3.4 subunits. Activation occurs via Gβγ dimers released upon activation of Gi/o-coupled G-protein coupled receptors (GPCRs). IKACh mediates parasympathetic slowing of heart rate and modulates inhibitory postsynaptic potentials in neurons.
- Other names
- GIRK channelG protein-gated inwardly rectifying potassium channelKir3.1Kir3.2Kir3.3Kir3.4
02
Mechanism of action
Indirectly modulated via drugs targeting upstream GPCRs
03
Biological functions
Regulation of membrane potentialNeuronal inhibitionHeart rate regulationPotassium ion transport
04
Disease associations
ArrhythmiasNeurological disorders
05
Safety considerations
Potential for off-target effects due to widespread expressionRisk of arrhythmias with inappropriate modulation
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