Premium
Oxygen from water is coordinated to manganese in the S 2 state of photosystem II
Author(s) -
Hansson Örjan,
Andréasson Lars-Erik,
Vänngård Tore
Publication year - 1986
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(86)80150-8
Subject(s) - photosystem ii , oxygen evolving complex , hyperfine structure , manganese , chemistry , electron paramagnetic resonance , radical , oxygen , photochemistry , hyperfine coupling , hydrogen peroxide , oxygen evolution , inorganic chemistry , photosynthesis , nuclear magnetic resonance , atomic physics , physics , electrochemistry , organic chemistry , biochemistry , electrode
Oxygen ligands from water are bound to the manganese cluster giving rise to the ‘multiline’ EPR signal from the S 2 state of photosystem II, as shown by the observation of hyperfine broadening of the EPR signal in the presence of 17 O‐enriched water. The binding must occur in the S 0 , S 1 or S 2 state. The estimated upper limit for the 17 O hyperfine coupling constant, 0.5 mT, excludes Superoxide and hydroxyl radicals in the S 2 state, but not peroxide.