Abstract
Euglena chloroplasts catalyze the Hill reaction with ferricyanide or dichlorophenol indophenol (DPIP) but not with nicotinamide adenine dinucleotide phosphate (NADP), methyl viologen or horse-heart cytochrome c. The latter compounds can serve as Hill oxidants with Euglena chloroplasts provided Euglena cytochrome-552 is included in the reaction mixture. This c-type cytochrome is solubilized during preparation of the algal chloroplasts. It acts in a catalytic fashion and appears to function in the electron transport chain which interconnects the two photosystems of photosynthesis. Euglena cytochrome-552 is most effective in restoration of NADP photoreduction activity; some restoration is observed with another algal c-type cytochrome, Porphyra tenera cytochrome-553. In contrast, restoration was not observed with either Euglena cytochrome-556 or horse-heart cytochrome c.
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