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• W2072429533 abstract "We have used a radiolabelled, benzophenone analog of bumetanide, 4-[3H]benzoyl-5-sulfamoyl-3-(3-thenyloxy)benzoic acid ([3H]BSTBA) to photolabel plasma membranes from duck red blood cells. BSTBA, like bumetanide, is a loop diuretic and a potent inhibitor of (Na + K + Cl) cotransport, and [3H]BSTBA binds to intact duck red cells with a high affinity similar to that of [3H]bumetanide (K 1/2 congruent to 0.1 microM). We incubated duck red cells with [3H]BSTBA, then lysed the cells and exposed the ghosts to ultraviolet light. The ghosting and photolysis was done at 0 degree C to prevent dissociation of the [3H]BSTBA. The ghosts were then sonicated to remove the nuclei and run on SDS-polyacrylamide gels. Analysis of H2O2-digested gel slices revealed [3H]BSTBA to be incorporated into a protein of approx. 150 kDa. This is the same molecular weight we obtain for a protein from dog kidney membranes which is photolabelled by [3H]BSTBA in a manner highly consistent with labelling of the (Na + K + Cl) cotransporter (Haas and Forbush (1987) Am. J. Physiol. 253, C243-C252). Several lines of evidence strongly suggest that the 150 kDa protein from duck red cell membranes is an integral component of the (Na + K + Cl)-cotransport system in these cells: (1) Photolabelling of this protein by [3H]BSTBA is blocked when 10 microM unlabelled bumetanide is included in the initial incubation medium with [3H]BSTBA; (2) Photoincorporation of [3H]BSTBA into the 150 kDa protein is markedly increased when the initial incubation medium is hypertonic or contains norepinephrine, conditions which similarly stimulate both (Na + K + Cl) cotransport and saturable [3H]bumetanide binding in duck red cells; (3) The photolabelling of this protein shows a saturable dependence on [3H]BSTBA concentration, with a K1/2 (0.06 microM) similar to that for the reversible, saturable binding of [3H]BSTBA and [3H]bumetanide to duck red cells; and (4) [3H]BSTBA photoincorporation into the 150 kDa protein, like saturable [3H]bumetanide binding to intact cells, requires the simultaneous presence of Na+, K+, and Cl- in the medium containing the radiolabelled diuretic." @default.
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• W2072429533 date "1988-03-01" @default.
• W2072429533 modified "2023-10-14" @default.
• W2072429533 title "Photoaffinity labelling of a 150 kDa (Na + K + Cl)-cotransport protein from duck red cells with an analog of bumetanide" @default.
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• W2072429533 doi "https://doi.org/10.1016/0005-2736(88)90054-5" @default.
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