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- W1535613423 abstract "Abstract Nucleotide substitutions in the gene for NADH-cytochrome b5 reductase were identified in three independent probands of hereditary methemoglobinemia type I. Patients in Kagoshima and Okinawa in Japan were shown to possess the same base change, from guanine to adenine at codon 57, which results in amino acid substitution from Arg to Gln. This nucleotide change was the same as formerly found in a patient in Toyoake, Japan (Katsube, T., Sakamoto, N., Kobayashi, Y., Seki, R., Hirano, M., Tanishima, K., Tomoda, A., Takazakura, E., Yubisui, T., Takeshita, M., Sakaki, Y., and Fukumaki, Y. (1991) Am. J. Hum. Genet. 48, 799-808). A type I patient in Italy was shown to have a base change from guanine to adenine at codon 105 which causes substitution from Val to Met. To characterize the enzymes of type I patients, Arg-57----Gln and Val-105----Met mutant enzymes were overexpressed in Escherichia coli and purified to homogeneity. kcat/Km values (NADH) of these two enzymes were 25% in Arg-57----Gln and 14.5% in Val-105----Met compared with that of the wild type enzyme, while the value of type II (generalized, severe form of the disease) mutant enzyme was 3% of the normal value (Yubisui, T., Shirabe, K., Takeshita, M., Kobayashi, Y., Fukumaki, Y., Sakaki, Y., and Takano, T. (1991) J. Biol. Chem. 266, 66-70). The type I mutant enzymes were less heat-stable and more susceptible to proteinase treatment than the wild type. From these results we conclude that restriction of enzyme deficiency to red cells in hereditary methemoglobinemia type I may be generally derived from instability and increased proteolytic susceptibility of variant NADH-cytochrome b5 reductases due to a point mutation." @default.
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- W1535613423 date "1992-10-01" @default.
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- W1535613423 title "Enzymatic instability of NADH-cytochrome b5 reductase as a cause of hereditary methemoglobinemia type I (red cell type)." @default.
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- W1535613423 doi "https://doi.org/10.1016/s0021-9258(19)88718-5" @default.
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