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- W2053308081 abstract "ATP hydrolysis by F1-ATPase is strongly inhibited by cationic rhodamines; neutral rhodamines are very poor inhibitors. Rhodamine 6G is a noncompetitive inhibitor of purified F0F1-ATPase and submitochondrial particles, however, an uncompetitive inhibitor of F1-ATPase (KI approximately equal to 2.4 microM for all three enzyme forms). Ethidium bromide is a noncompetitive inhibitor of F0F1-ATPase, submitochondrial particles and also F1-ATPase (KI approximately equal to 270 microM). Neither of the inhibitors affects the negative cooperativity (nH approximately equal to 0.7). The non-identical binding sites for rhodamine 6G and ethidium bromide are located on the F1-moiety and are topologically distinct from the catalytic site. Binding of the inhibitors prevents the conformational changes essential for energy transduction. It is concluded that the inhibitor binding sites are involved in proton translocation. In F1-ATPase, binding of MgATP at a catalytic site causes conformational changes, which allosterically induce the correct structure of the rhodamine 6G binding site. In F0F1-ATPase, this conformation of the F1-moiety exists a priori, due to allosteric interactions with F0-subunits. The binding site for ethidium bromide on F1-ATPase does not require substrate binding at the catalytic site and is not affected by F0F1-subunit interactions." @default.
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- W2053308081 date "1987-06-01" @default.
- W2053308081 modified "2023-09-27" @default.
- W2053308081 title "Inhibition of yeast mitochondrial F1-ATPase, F0F1-ATPase and submitochondrial particles by rhodamines and ethidium bromide" @default.
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- W2053308081 doi "https://doi.org/10.1016/0005-2728(87)90253-2" @default.
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