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Target intelligence / Profile preview
G Protein-Coupled Inwardly Rectifying Potassium Channel (GIRK channel)
- Target
- GIRK channel
- Molecular classification
- Ion channel, Potassium channel, Inwardly rectifying potassium channel, G protein-coupled receptor effector
01
Overview
G protein-coupled inwardly rectifying potassium (GIRK) channels, also known as Kir3.x channels, are a family of potassium ion channels that play a crucial role in regulating cellular excitability, particularly in the heart and brain. They are activated by G protein-coupled receptors (GPCRs) via direct interaction with G-protein βγ subunits and require the presence of phosphatidylinositol 4,5-bisphosphate (PIP2) for activation. Functions include hyperpolarization of cell membrane, mediation of neurotransmission effects on neurons and regulation of cardiac rhythm. The channel is tetrameric, with each subunit containing two transmembrane domains, a reentrant P-loop, and cytoplasmic N- and C-terminal regions.
- Other names
- Kir3.x channelsInwardly Rectifying Potassium Channel 3KCNJ channels
02
Mechanism of action
Channel modulation via G protein beta-gamma subunits and PIP2
03
Biological functions
Regulation of cellular excitabilityHyperpolarization of cell membraneRegulation of neuronal firingRegulation of cardiac rhythmMediation of neurotransmitter effects
04
Disease associations
Cardiac arrhythmiasEpilepsyNeurodegenerative diseasesAnxietyDepressionPain
05
Safety considerations
Potential for cardiac side effects due to heart rate regulationPotential for neurological side effects due to neuronal excitability modulation
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