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- W2090958913 abstract "Modification of carboxyl groups of the (Na+ + K+)-ATPase with the water soluble 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide or of amino groups, histidine or alpha-amino groups, with diethylpyrocarbonate gives a pronounced decrease in apparent affinity for K+ for transition from the Na+-form to the K+-form at a given Na+ concentration. The fluorescence of eosin is used to monitor the conformational transitions. The decrease in apparent affinity for K+ is due to an increase in the rate of the conformational transition from E2 with K+ occluded, E2(Km+), to E2 with K+ non-occluded, E2Km+, and to a lesser degree to a decrease in the rate of the reverse reaction, while there is little or no effect on the transition between E2 in the absence of K+ and E1Nan+. The conformational transition between E2(Km+) and E2Km+ is thus much more sensitive to a change in the tertiary and/or quaternary structure than the conformational transition between E2 and E1Nan+. The pK values for the carboxyl groups are lower with the enzyme in the K+-form than in the Na+-form; in the Na+-form it seems to be lower than the lowest tested, pH 5.5. The diethylpyrocarbonate reactive amino group has a higher pK with the enzyme in the K+-form, about 8.0, than in the Na+-form, about 7.5. Plots of log K0.5 for K+ for reversal of the effect of Na+ on the conformation vs. log[Na+] at a given pH, and vs. pH (from 6.8 to 8.0) at a given Na+ concentration give straight lines, and the slope suggests that 4 Na+ on E1, E1Na4+, is replaced by 2 K+ + 1 H+ on E2, E2(K2+)H+. Modification of the amino groups with diethylpyrocarbonate shifts the log K+ vs. pH plot towards a higher K+ value at a given pH, but the slope is as for control enzyme, while the log K+ vs. log[Na+] plot becomes non-linear. None of the plots are linear after modification of the carboxyl groups with the carbodiimide." @default.
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- W2090958913 date "1985-09-01" @default.
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- W2090958913 title "Modification of the (Na+ + K+)-ATPase with 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide and with diethylpyrocarbonate. Effect on the conformational transition" @default.
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- W2090958913 doi "https://doi.org/10.1016/0005-2736(85)90202-0" @default.
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