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On the role of ferredoxin and ferredoxin-NADP+ reductase in cyclic electron transport of spinach chloroplasts.

Antibodies prepared against purified spinach ferredoxin and ferredoxin-NADP+ reductase were used as specific inhibitors of electron-transfer reactions dependent on either ferredoxin or ferredoxin-NADP+ reductase; The possible role of both electron carriers in cyclic electron transport was checked using cytochrome b6 photoreactions as indicator. It could be demonstrated that the ferredoxin antibody inhibits cytochrome b6 photoreduction. Ferredoxin-NADP+ reductase, however, appears not to be involved in this pathway: reductase antibody in concentrations sufficient to completely inhibit electron transport to NADP+ had no effect on cytochrome b6 photoreduction. Quantitative treatment of the immunoassay data showed that osmotically shocked chloroplasts contain both bound ferredoxin and ferredoxin-NADP+ reductase in concentration approximately equal to that of cytochrome b6.