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The flavoenzyme l-galactono-γ-lactone dehydrogenase (GALDH) catalyzes the terminal step of vitamin C biosynthesis in plants. Little is known about the catalytic mechanism of GALDH and related aldonolactone oxidoreductases. Here we identified an essential Glu–Arg pair in the active site of GALDH from Arabidopsis thaliana. Glu386 and Arg388 variants show high K m values for l-galactono-1,4-lactone...
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