Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10796135 | Biochimica et Biophysica Acta (BBA) - Bioenergetics | 2005 | 8 Pages |
Abstract
We investigated a new EPR signal that gives a broad line shape around g=2 in Ca2+-depleted Photosystem (PS) II. The signal was trapped by illumination at 243 K in parallel with the formation of YZ. The ratio of the intensities between the g=2 broad signal and the YZ signal was 1:3, assuming a Gaussian line shape for the former. The g=2 broad signal and the YZ signal decayed together in parallel with the appearance of the S2 state multiline at 243 K. The g=2 broad signal was assigned to be an intermediate S1X state in the transition from the S1 to the S2 state, where X represents an amino acid radical nearby manganese cluster, such as D1-His337. The signal is in thermal equilibrium with YZ. Possible reactions in the S state transitions in Ca2+-depleted PS II were discussed.
Keywords
MOPSCa2+ depletionENDORDCMUOEC2-(N-morpholino)ethanesulfonic acid3-(3,4-Dichlorophenyl)-1,1-dimethylureaEDTAethylene diamine tetraacetic acid2-Morpholinoethanesulfonic acidOxygen evolving complexEPRElectron paramagnetic resonanceManganese clusterElectron nuclear double resonancePhotosystemPhotosystem IIMeSContinuous-waveOxygen-evolving complex
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Authors
Hiroyuki Mino, Shigeru Itoh,