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- W2066451255 abstract "Oxidation-reduction midpoint potentials (E(m)) have been measured for the thioredoxin-dependent, reductive activation of sorghum nicotinamide adenine dinucleotide phosphate- (NADP-) dependent malate dehydrogenase (MDH) in the wild-type enzyme and in a number of site-specific mutants. The E(m) value associated with activation of the wild-type enzyme, -330 mV at pH 7.0, can be attributed to the E(m) of the C365/C377 disulfide present in the C-terminal region of the enzyme. The C24/C29 disulfide, located in the N-terminal region of the enzyme and the only other disulfide present in oxidized, wild-type MDH, has a E(m) value of -280 mV at pH 7.0. A third regulatory disulfide, C24/C207, that is absent in the oxidized enzyme but is thought to be formed during the activation process, has an E(m) value at pH 7.0 of -310 mV. E(m) vs pH profiles suggest pK(a) values for the more acidic cysteine involved in the formation of each of these disulfides of 8.5 for C24/C29; 8.1 for C24/C207; and 8.7 for C365/C377. The results of this study show that the N-terminal disulfide formed between C24 and C29 has a more positive E(m) value than the two other disulfides and is thus is likely to be the preregulatory disulfide postulated to function in activating the enzyme." @default.
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- W2066451255 date "2000-02-26" @default.
- W2066451255 modified "2023-09-30" @default.
- W2066451255 title "Oxidation−Reduction Properties of the Regulatory Disulfides of Sorghum Chloroplast Nicotinamide Adenine Dinucleotide Phosphate−Malate Dehydrogenase" @default.
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- W2066451255 doi "https://doi.org/10.1021/bi9916731" @default.
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