Abstract

Plant redox-related proteins were overexpressed using a genetic codon substitution downstream of the translation initiation codon. This method significantly improved recombinant protein expression levels of Arabidopsis chloroplastic thioredoxins and cytosolic nicotinamide adenine dinucleotide phosphate (NADPH)-dependent thioredoxin reductase (E.C. 1.8.1.9) in Escherichia coli. Using these proteins, the in vitro chloroplastic thioredoxins-reduction system was reconstituted in an NADPH-dependent manner. This system could convert the five classes of chloroplastic Arabidopsis thioredoxins and two chloroplastic Spinach thioredoxins to their reduced forms, independent of dithiothreitol and the photosynthetic electron transport system.

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