Journal
BIOCHEMICAL JOURNAL
Volume 371, Issue -, Pages 597-601Publisher
PORTLAND PRESS LTD
DOI: 10.1042/BJ20021265
Keywords
copper; cytochrome b(559); fluorescence quenching; oxygen evolution; Photosystem II
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We have found that elevated copper concentrations, apart from the inhibition of oxygen evolution, changed the initial states distribution of the oxygen-evolving complex. Already at low concentrations, copper ions oxidized the low-potential form of cytochrome b(559) and also its high-potential form at higher concentrations at which fluorescence quenching was observed. We suggest that the primary target sites in Photosystem II for copper is tyrosine(z), both cytochrome b(559) forms and chlorophyll(z), and that these sites are the source of the copper-induced fluorescence quenching and oxygen evolution inhibition in Photosystem II.
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