Rapid formation of the stable tyrosyl radical in photosystem II.

  title={Rapid formation of the stable tyrosyl radical in photosystem II.},
  author={Peter Faller and Richard J Debus and Klaus Brettel and Miwa Sugiura and A William Rutherford and Alain Boussac},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  volume={98 25},
Two symmetrically positioned redox active tyrosine residues are present in the photosystem II (PSII) reaction center. One of them, TyrZ, is oxidized in the ns-micros time scale by P680+ and reduced rapidly (micros to ms) by electrons from the Mn complex. The other one, TyrD, is stable in its oxidized form and seems to play no direct role in enzyme function. Here, we have studied electron donation from these tyrosines to the chlorophyll cation (P680+) in Mn-depleted PSII from plants and… CONTINUE READING

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