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- W2000467940 abstract "(1) A quantitative study has been made of the binding of ouabain to the (Na+ + K+)-ATPase in homogenates prepared from brain tissue of the hawk moth, Manduca sexta. The results have been compared to those obtained in bovine brain microsomes. (2) The insect brain (Na+ + K+)-ATPase will bind ouabain either in the presence of Mg2+ and Pi, ('Mg2+, Pi' conditions) or in the presence of Na+, Mg2+, and an adenine nucleotide ('nucleotide' conditions) as is the case for the bovine brain (Na+ + K+)-ATPase. The binding conditions did not alter the total number of receptor sites measured at high ouabain concentrations in either tissue. (3) Potassium ion decreases the affinity (increases the KD) of ouabain to the M. sexta brain (Na+ + K+)-ATPase under both binding conditions. However, ouabain binding is more sensitive to K+ inhibition under the nucleotide conditions. In bovine brain ouabain binding is equally sensitive to K+ inhibition under both conditions. (4) The enzyme-ouabain complex has a rate of dissociation that is 10-fold faster in the M. sexta preparation than in the bovine brain preparation. Because of this, the M. sexta (Na+ + K+)-ATPase has a higher KD for ouabain binding and is less sensitive to inhibition by ouabain than the bovine brain enzyme. (5) This data supports the hypothesis that two different conformational states of the M. sexta (Na+ + K+)-ATPase can bind ouabain." @default.
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- W2000467940 date "1981-12-01" @default.
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- W2000467940 title "The insect brain (Na+ + K+)-ATPase Binding of ouabain in the hawk moth, Manduca sexta" @default.
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- W2000467940 doi "https://doi.org/10.1016/0005-2736(81)90407-7" @default.
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