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- W2145196368 abstract "The native flavin, FAD, of spinach ferredoxin--NADP+ reductase, has been replaced by a number of FAD analogues with modifications of the isoalloxazine ring system. The apoenzyme binds 8-mercapto-FAD in its thiolate anion form and 6-hydroxy-FAD in its neutral form. These results are consistent with classification of this enzyme as a dehydrogenase/electron transferase, an ascription originally made on the basis of its physiological function and in common with other properties of this class, e.g. stabilization of the neutral flavin semiquinone. The chemical reactivity toward methylmethanethiolsulfonate of the 8-mercapto-FAD . enzyme clearly shows that the flavin 8-position is exposed to solvent. On the other hand, the lack of reactivity with the 2-thio-FAD . enzyme indicates that the pyrimidine subnucleus of the flavin is buried within the protein molecule. The seven modified flavins examined all support NADPH--ferricyanide reductase activity, the catalytic velocity being directly proportional to the redox potential of the flavin. No such linear free energy relationship was found between redox potential and activity with ferredoxin or iodonitrotetrazolium as acceptor." @default.
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- W2145196368 date "1983-04-01" @default.
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- W2145196368 title "FAD Analogues as Mechanistic and 'Binding-Domain' Probes of Spinach Ferredoxin-NADP+ Reductase" @default.
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- W2145196368 doi "https://doi.org/10.1111/j.1432-1033.1983.tb07348.x" @default.
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