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Crofts, Antony R. Kanazawa, Atsuko 2015-09-25T22:46:14Z 2015-09-25T22:46:14Z 10000-01-01 1997 1997 H252Q and six donor-side mutants became the important tools to investigate a new model of neutral tyrosine radical, $\rm Y\sb{Z}\sp\cdot,$ introduced by Gilchrist et al. (1995) and Hoganson et al. (1995). In this new model, $\rm Y\sb{Z}$ is not simply a redox active residue in the electron transfer reactions, but is also directly involved in the water-oxidation. The models are critically-dependent on the presence of a neutral radical form of $\rm Y\sb{Z}\ (Y\sb{Z}\sp{\cdot}).$ The donor-side mutants, $\rm E189 > L,Q,$ and $\rm N191 > A,D,L,$ had only small effects on the pH-dependence of the rate of Q$\rm\sb{A}\sp-$ and oxidized $\rm Y\sb{Z}$ recombination. On the other hand, E189D mutant showed a pH-independent in rate of $\rm Q\sb{A}\sp-$ and oxidized $\rm Y\sb{Z}$ recombination. Based on these data, a simple thermodynamic model was introduced to explain the results and the model of $\rm Y\sb{Z}\sp{\cdot}$ as an oxidized form. Made available in DSpace on 2015-09-25T22:46:14Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 9812648.pdf: 5760899 bytes, checksum: bf5eb32f170781cab2d9be75cce2a7b8 (MD5) Previous issue date: 1997 Embargo set by: Seth Robbins for item 86762 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 174 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1997. http://hdl.handle.net/2142/85481 (MiAaPQ)AAI9812648 eng Biology, Plant Physiology Electron Transfer on the Donor and Acceptor Sides of Photosystem II Explored by Site-Directed Mutagenesis and Kinetic Spectroscopy text Biophysics and Computational Biology Biophysics and Computational Biology University of Illinois at Urbana-Champaign Dissertation Ph.D.