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Target intelligence / Profile preview
ATP-sensitive potassium channel in pancreatic beta cell (KATP channel)
- Target
- KATP channel
- Molecular classification
- Ion channel, Potassium channel, ATP-binding cassette transporter (SUR1), Inward rectifier potassium channel (Kir6.2), Multi-subunit complex
01
Overview
The ATP-sensitive potassium (KATP) channel in pancreatic beta cells is a hetero-octameric protein complex composed of four Kir6.2 and four SUR1 subunits. It couples cellular metabolism to electrical activity, regulating insulin secretion in response to changes in intracellular ATP and ADP levels. It is a key target for sulfonylurea drugs used to treat type 2 diabetes and is implicated in neonatal diabetes and congenital hyperinsulinism.
- Other names
- Pancreatic beta-cell KATP channelATP-regulated K+ channelSUR1/Kir6.2 channel
02
Mechanism of action
Sulfonylureas bind to SUR1 subunit, closing the KATP channel, leading to membrane depolarization and insulin release. ATP inhibits the channel. MgADP activates the channel.
03
Biological functions
Regulation of insulin secretionGlucose sensingCell membrane potential regulationMetabolic couplingPotassium transport
04
Disease associations
Diabetes mellitus (Type 2)Neonatal diabetesCongenital hyperinsulinismHypoglycemia
05
Safety considerations
Hypoglycemia (sulfonylureas, inactivating mutations)Hyperglycemia/diabetes (activating mutations)Drug-induced hypoglycemia
06
Interacting drugs
Sulfonylureas (e.g., glibenclamide, tolbutamide)
3 more in the full profile.
07
Biomarkers
Mutations in KCNJ11 (Kir6.2) and ABCC8 (SUR1) genesE23K polymorphism in Kir6.2
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