Abstract:
: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, S(n), 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 S(1)-to-S(2) 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 S(1) state. These spontaneous structural changes are attributed to a S(1)' intermediate, at the same oxidation level as S(1), in the process of photosynthetic water oxidation.
journal_name
Biophys Jjournal_title
Biophysical journalauthors
Halverson KM,Barry BAdoi
10.1016/S0006-3495(03)74680-3subject
Has Abstractpub_date
2003-10-01 00:00:00pages
2581-8issue
4eissn
0006-3495issn
1542-0086pii
S0006-3495(03)74680-3journal_volume
85pub_type
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