منابع مشابه
How ATP Inhibits the Open KATP Channel
ATP-sensitive potassium (K(ATP)) channels are composed of four pore-forming Kir6.2 subunits and four regulatory SUR1 subunits. Binding of ATP to Kir6.2 leads to inhibition of channel activity. Because there are four subunits and thus four ATP-binding sites, four binding events are possible. ATP binds to both the open and closed states of the channel and produces a decrease in the mean open time...
متن کاملThe mechanism of KATP channel inhibition by ATP
Dear Sir, Ribalet et al. (1989) have presented interesting data on the regulation of KAav channel activity by phosphorylation, and an intriguing hypothesis to explain KAy P channel inhibition by ATP. They propose that the opening and closing of the KAvp channel can be explained by a one-site phosphorylation model, outlined in Fig. 1 A. According to the model of Ribalet et al. (1989), the openin...
متن کاملOpen State Destabilization by Atp Occupancy Is Mechanism Speeding Burst Exit Underlying KATP Channel Inhibition by Atp
The ATP-sensitive potassium (K(ATP)) channel is named after its characteristic inhibition by intracellular ATP. The inhibition is a centerpiece of how the K(ATP) channel sets electrical signaling to the energy state of the cell. In the beta cell of the endocrine pancreas, for example, ATP inhibition results from high blood glucose levels and turns on electrical activity leading to insulin relea...
متن کاملMolecular determinants of KATP channel inhibition by ATP.
ATP-sensitive K+ (KATP) channels are both inhibited and activated by intracellular nucleotides, such as ATP and ADP. The inhibitory effects of nucleotides are mediated via the pore-forming subunit, Kir6.2, whereas the potentiatory effects are conferred by the sulfonylurea receptor subunit, SUR. The stimulatory action of Mg-nucleotides complicates analysis of nucleotide inhibition of Kir6. 2/SUR...
متن کاملATP-sensitive potassium channel (KATP channel) expression in the normal canine pancreas and in canine insulinomas
BACKGROUND Pancreatic beta cells express ATP-sensitive potassium (KATP) channels that are needed for normal insulin secretion and are targets for drugs that modulate insulin secretion. The KATP channel is composed of two subunits: a sulfonylurea receptor (SUR 1) and an inward rectifying potassium channel (Kir6.2). KATP channel activity is influenced by the metabolic state of the cell and initia...
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ژورنال
عنوان ژورنال: Journal of General Physiology
سال: 2008
ISSN: 1540-7748,0022-1295
DOI: 10.1085/jgp.200709874