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- W2043244253 abstract "The binding site of cyclosporin A to P-glycoprotein was characterized by using a multidrug-resistant Chinese hamster ovary cell line. P-glycoprotein photolabeled with diazirine−cyclosporin A analogue was purified by a two-step process involving continuous elution electrophoresis followed by wheat germ agglutinin−agarose precipitation. The cyclosporin A covalently bound to P-glycoprotein and to subsequent proteolytic fragments was detected by Western blot analysis using a monoclonal antibody against cyclosporin A. Proteolytic digestion of purified P-glycoprotein by V8 generated a major fragment of 15 kDa photolabeled by cyclosporin A, while proteolysis of P-glycoprotein photolabeled by [125I]iodoaryl azidoprazosin generated a major fragment of 7 kDa. Limited proteolysis of cyclosporin A-photolabeled P-glycoprotein with trypsin indicated that the major binding site for cyclosporin A was in the C-terminal half of the protein. This cyclosporin A binding site was further characterized with chemical agents (N-chlorosuccinimide, cyanogen bromide, and 2-nitro-5-thiocyanobenzoate). These three chemical agents established a proteolytic profile of P-glycoprotein for fragments photolabeled with cyclosporin A and for fragments that contained the C494 and C219 epitopes. The smallest fragments generated by these chemical agents include the transmembrane domains (TMs) 10, 11, and 12 of P-glycoprotein. When the fragments generated by these chemical agents are aligned, the region that binds cyclosporin A is reduced to the 953−1007 residues. These combined results suggest that the major binding site of cyclosporin A occurs between the end of TM 11 and the end of TM 12." @default.
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- W2043244253 date "1998-12-01" @default.
- W2043244253 modified "2023-10-08" @default.
- W2043244253 title "Identification of the Cyclosporin-Binding Site in P-Glycoprotein" @default.
- W2043244253 doi "https://doi.org/10.1021/bi981992c" @default.
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