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- W2068507758 abstract "We have studied the effects on the oxidation-reduction potential of cytochrome b-559HP of a variety of treatments known to inhibit oxygen evolution by isolated chloroplasts. NH2OH and 0.8 M Tris buffer had no effect on the cytochrome. Treatment of a chloroplast suspension with heptane, Triton X-100, NaClO4, KI, 2,4,6-triiodophenol or trypsin all caused the conversion of the cytochrome to a low-potential form not reducible by hydroquinone. However, there was no consistent relation between the effect on the cytochrome and the effects on photochemical activities. Three main conclusions were drawn from the results: (i) Cytochrome b-559HP cannot be directly involved in the process of water oxidation. (ii) Cytochrome b-559HP cannot be directly involved in the oxidation of diphenylcarbazide through Photosystem II. (iii) The conformation of the cytochrome, and hence its redox potential, depends in part on hydrophobic lipid protein interactions which would be disturbed by several of the treatments mentioned above and also by some others known to effect the potential of the cytochrome. The photoreduction of the component P546 (C550) at 77 °K was shown to be relatively resistant to treatment of chloroplasts with perchlorate, trypsin or triidophenol. The results supported the view that P546 is either a primary electron acceptor of Photosystem II or else provides an indication of the redox state of the primary acceptor." @default.
- W2068507758 created "2016-06-24" @default.
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- W2068507758 date "1972-10-01" @default.
- W2068507758 modified "2023-09-25" @default.
- W2068507758 title "The Effects on cytochrome b-559HP and P546 of treatments that inhibit oxygen evolution by chloroplasts" @default.
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- W2068507758 doi "https://doi.org/10.1016/0005-2728(72)90104-1" @default.
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