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• W2057173645 abstract "ATP-binding cassette (ABC) superfamily proteins have divergent functions and can be classified as transporters, channels, and receptors, although their predicted secondary structures are very much alike. Prominent members include the sulfonylurea receptor (SUR1) and the multidrug transporter (MDR1). SUR1 is a subunit of the pancreatic beta-cell K(ATP) channel and plays a key role in the regulation of glucose-induced insulin secretion. SUR1 binds ATP at NBF1, and ADP at NBF2 and the two NBFs work cooperatively. The pore-forming subunit of the pancreatic beta-cell K(ATP) channel, Kir6.2, is a member of the inwardly rectifying K(+) channel family, and also binds ATP. In this article, we present a model in which the activity of the K(ATP) channel is determined by the balance of the action of ADP, which activates the channel through SUR1, and the action of ATP, which stabilizes the long closed state by binding to Kir6.2. The concentration of ATP could also affect the channel activity through binding to NBF1 of SUR1. MDR1, on the other hand, is an ATP-dependent efflux pump which extrudes cytotoxic drugs from cells before they can reach their intracellular targets, and in this way confers multidrug resistance to cancer cells. Both NBFs of MDR1 can hydrolyze nucleotides, and their ATPase activity is necessary for drug transport. The interaction of SUR1 with nucleotides is quite different from that of MDR1. Variations in the interactions with nucleotides of ABC proteins may account for the differences in their functions." @default.
• W2057173645 created "2016-06-24" @default.
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• W2057173645 date "1999-12-01" @default.
• W2057173645 modified "2023-09-23" @default.
• W2057173645 title "Comparative aspects of the function and mechanism of SUR1 and MDR1 proteins" @default.
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• W2057173645 doi "https://doi.org/10.1016/s0005-2736(99)00157-1" @default.
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