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Target intelligence / Profile preview
ATP-Sensitive Potassium Channel (Pancreatic Beta Cell) (KATP channel)
- Target
- KATP channel
- Molecular classification
- Ion channel, Potassium channel, Inward-rectifier potassium channel, ABC transporter
01
Overview
The ATP-sensitive potassium (KATP) channel in pancreatic beta cells is an octameric protein complex consisting of four Kir6.2 and four SUR1 subunits. It couples the cell’s metabolic state to its electrical activity, regulating insulin secretion. High intracellular ATP levels cause channel closure, leading to depolarization and insulin release, while low ATP levels open the channel, hyperpolarizing the membrane and inhibiting insulin release. It is the target of sulfonylurea drugs and mutations in its genes (*KCNJ11* and *ABCC8*) are associated with congenital hyperinsulinism and neonatal diabetes mellitus.
- Other names
- KATP channel (pancreatic beta cell)ATP-gated potassium channelKir6.2/SUR1 channel
02
Mechanism of action
Sulfonylureas bind to SUR1 subunit causing closure of the channel, leading to cell depolarization and insulin release. Channel openers activate/open the channel via interaction with SURs.
03
Biological functions
Regulation of insulin secretionGlucose sensingMembrane potential regulationCoupling cellular metabolism with electrical activity
04
Disease associations
Diabetes mellitusCongenital hyperinsulinism
05
Safety considerations
Hypoglycemia (with sulfonylurea use)Potential for inappropriate insulin release
06
Interacting drugs
Sulfonylureas
1 more in the full profile.
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