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- W2074659299 abstract "Chemical modification of plastocyanin was carried out using 4-chloro-3,5-dinitrobenzoic acid, which has the effect of replacing positive charges on amino groups with negatively charged carboxyl groups. Four singly-modified forms were obtained which were separated using anion exchange FPLC. The four forms were modified at the N-terminal valine and at lysines 54, 71 and 77. The rates of reaction with mammalian cytochrome c were increased for all four modified plastocyanins. In contrast, the rates of reaction with cytochrome f were inhibited for the forms modified at residues 1, 54 and 77, whereas no effect was observed for the form modified at residue 71. Modification had no effect on either the midpoint redox potential or the reaction with K3Fe(CN)6. These results are consistent with a model in which charged residues on plastocyanin located at or near the binding site for cytochrome f recognize the positively-charged binding site on cytochrome f. In contrast, charged residues located at points on plastocyanin distant from the cytochrome f binding site recognize the net negative charge on the cytochrome f molecule. Based on these considerations, Glu-68 may be within the interaction sphere of cytochrome f, suggesting that cytochrome f may donate electrons to plastocyanin at either Tyr-83 or His-87." @default.
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- W2074659299 date "1990-03-01" @default.
- W2074659299 modified "2023-09-27" @default.
- W2074659299 title "Chemical modification of spinach plastocyanin using 4-chloro-3,5-dinitrobenzoic acid: Characterization of four singly-modified forms" @default.
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- W2074659299 doi "https://doi.org/10.1016/0005-2728(90)90012-s" @default.
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