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Chromatium vinosum, an anaerobic photosynthetic purple sulfur bacterium, resembles aerobic bacterial cells in that it has an NADP-thioredoxin system composed of a single thioredoxin which is reduced by NADPH via NADP-thioredoxin reductase. Both protein components were purified to homogeneity, and some of their properties were determined. Chromatium vinosum thioredoxin was slightly larger than other bacterial thioredoxins (13 versus 12 kilodaltons) but was similar in its specificity (ability to activate chloroplast NADP-malate dehydrogenase more effectively than chloroplast fructose-1,6-bisphosphatase) and immunological properties. As in other bacteria, Chromatium vinosum NADP-thioredoxin reductase was an arsenite-sensitive flavoprotein composed of two 33.5-kilodalton subunits, that required thioredoxin for the NADPH-linked reduction of 5,5'-dithiobis(2-nitrobenzoic acid). Chromatium vinosum NADP-thioredoxin reductase very effectively reduced several different bacterial-type thioredoxins (Escherichia coli, Chlorobium thiosulfatophilum (this name has not been approved by the International Committee of Systematic Bacteriology), Rhizobium meliloti) but not others (Clostridium pasteurianum, spinach chloroplast thioredoxin m). The results show that Chromatium vinosum contains an NADP-thioredoxin system typical of evolutionarily more advanced microorganisms.

Thioredoxin system of the photosynthetic anaerobe Chromatium vinosum