Photooxidation of the high-potential iron—sulfur center in chloroplasts

AUTOR(ES)

Whitmarsh, John

RESUMO

The high-potential iron—sulfur center associated with the g = 1.89-1.90 electron paramagnetic resonance signal in spinach chloroplasts is fully reduced in the dark. It is photooxidized in the presence of 3-(3,4-dichlorophenyl)-1,1-dimethylurea and reduced after illumination with red actinic light in the absence of inhibitors. The light-induced redox changes of the high-potential iron—sulfur center are shown to correlate with those of plastocyanin detected at g = 2.05. Demonstration of light-induced redox changes in the high-potential iron—sulfur center provides support for a functional role of this component in the chloroplast electron transport chain.

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