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Biophysical Journal 85:2581-2588 (2003)
© 2003 The Biophysical Society

Evidence for Spontaneous Structural Changes in a Dark-Adapted State of Photosystem II

Kelly M. Halverson and Bridgette A. Barry

Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, St. Paul, Minnesota

Correspondence: Address reprint requests to Bridgette A. Barry, 140 Gortner Laboratory, 1479 Gortner Ave., BMBB, University of Minnesota, St. Paul, MN 55108-1022. Tel.: 612-624-6732; Fax: 612-625-5780; E-mail: barry{at}cbs.umn.edu.

Photosystem II catalyzes photosynthetic water oxidation in plants, green algae, and cyanobacteria. The manganese-containing active site cycles through a series of five oxidation states, Sn, where n refers to the number of oxidizing equivalents stored. In this report, reaction-induced Fourier transform infrared and electron paramagnetic resonance spectra of the S1-to-S2 transition are presented. These data suggest that changes in carboxylate ligation to manganese, changes in secondary structure, and/or changes in polarity occur during dark adaptation in the S1 state. These spontaneous structural changes are attributed to a S1' intermediate, at the same oxidation level as S1, in the process of photosynthetic water oxidation.




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