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- Title
High-field (94-GHz) EPR spectroscopy on the S<sub>2</sub> multiline signal of photosystem II
- Authors
Teutloff, Christian; Keßen, Sven; Kern, Jan; Zouni, Athina; Bittl, Robert
- Abstract
Abstract: The multiline signal of the S2 state in Photosystem II was measured both in frozen-solution and single-crystal preparations from the cyanobacterium Thermosynechococcus elongatus. The frozen-solution EPR spectrum shows a gaussian-like line shape without any resolution of Mn hyperfine couplings. This line shape can be understood on the basis of the single-crystal spectra, where a strong orientation dependence of partially resolved hyperfine structures appears. Simulation of the frozen-solution spectrum on the basis of Mn hyperfine couplings taken from published pulse-ENDOR data yields a fully rhombic g-matrix for the multiline signal with principal components 1.997, 1.970, and 1.965. The resulting isotropic g-value g iso =1.977 is surprisingly small compared to other manganese complexes containing manganese ions in the formal oxidation states three and four.
- Subjects
CRYOBIOLOGY; LOW temperatures; HYPERFINE structure; BIOLOGY
- Publication
FEBS Letters, 2006, Vol 580, Issue 15, p3605
- ISSN
0014-5793
- Publication type
Article
- DOI
10.1016/j.febslet.2006.05.039