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- W1526571049 abstract "Woodward's reagent K (N-ethyl-5-phenylisoxazolium-3'-sulfonate) inactivated both soluble and membrane bound-ferredoxin-NADP+ reductase of spinach chloroplasts. Either NADP+ or NADPh afforded complete protection against modification. Ki and the apparent Kd for protection afforded by NADP+ depended on the ionic strength of the medium. Nucleophylic displacement of reagent bound to the soluble enzyme by [14C]glycine ethyl ester showed that 5 to 6 carboxyl groups/flavin were modified when the diaphorase activity was completely inhibited. In differential labeling experiments using NADP+ as protective agent, it was shown that enzyme inactivation was due to blocking of only 1 carboxyl group/mol. Derivatized reductase did not bind pyridine nucleotides. Protection by NADP+ of the membrane-bound reductase was higher, and the apparent Kd for NADP+ lower, in the light than in the dark. Inactivation increased abruptly with the external pH, indicating a progressive exposure of the carboxyl group as the pH was raised. The results presented suggest (a) the existence of a light-driven conformational change and a pH-dependent transition in membrane-bound ferredoxin-NADP+ reductase; (b) the presence of an essential carboxyl residue in the nucleotide binding site of the reductase." @default.
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- W1526571049 date "1981-07-01" @default.
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- W1526571049 title "An essential carboxyl group at the nucleotide binding site of ferredoxin-NADP+ oxidoreductase." @default.
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- W1526571049 doi "https://doi.org/10.1016/s0021-9258(19)69066-6" @default.
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