Abstract:
:The multiline signal of the S(2) 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.
journal_name
FEBS Lettjournal_title
FEBS lettersauthors
Teutloff C,Kessen S,Kern J,Zouni A,Bittl Rdoi
10.1016/j.febslet.2006.05.039subject
Has Abstractpub_date
2006-06-26 00:00:00pages
3605-9issue
15eissn
0014-5793issn
1873-3468pii
S0014-5793(06)00639-9journal_volume
580pub_type
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