Sulfonylurea receptor
| ATP-binding cassette, subfamily C (CFTR/MRP), member 8 | |
|---|---|
| Identifiers | |
| Symbol | ABCC8 |
| Alt. symbols | SUR1 |
| Entrez | 6833 |
| HUGO | 59 |
| OMIM | 600509 |
| RefSeq | NM_000352 |
| UniProt | Q09428 |
| Other data | |
| Locus | Chr. 11 p15.1 |
| ATP-binding cassette, subfamily C (CFTR/MRP), member 9 | |
|---|---|
| Identifiers | |
| Symbol | ABCC9 |
| Alt. symbols | SUR2A, SUR2B |
| Entrez | 10060 |
| HUGO | 60 |
| OMIM | 601439 |
| RefSeq | NM_005691 |
| UniProt | O60706 |
| Other data | |
| Locus | Chr. 12 p12.1 |
In the field of molecular biology, the sulfonylurea receptors (SUR) are membrane proteins which are the molecular targets of the sulfonylurea class of antidiabetic drugs whose mechanism of action is to promote insulin release from pancreatic beta cells. More specifically, SUR proteins are subunits of the inward-rectifier potassium ion channels Kir6.x (6.1 and 6.2). The association of four Kir6.x and four SUR subunits form an ion conducting channel commonly referred to as the KATP channel.
Three forms of the sulfonylurea receptor are known, SUR1 encoded by the ABCC8 gene, and SUR2A and SUR2B, which are splice variants arising from a single ABCC9 gene.
The primary function of the sulfonylurea receptor is to sense intracellular levels of the nucleotides ATP and ADP and in response facilitate the open or closing its associated Kir6.x potassium channel. Hence, the KATP channel monitors the energy balance within the cell.
Depending on the tissue in which the KATP channel is expressed, altering the membrane potential can trigger a variety of downstream events. For example, in pancreatic beta cells, high levels of glucose lead to increased production of ATP, which, in turn, binds to the KATP channel resulting in channel closure. The increase in membrane potential, in turn, opens voltage-dependent calcium channels increasing intracellular calcium concentrations, which triggers exocytosis of insulin.
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Wikipedia