Premium
On the change of the charges in the four photo‐induced oxidation steps of the water‐splitting enzyme system S
Author(s) -
Saygin Ö.,
Witt H.T.
Publication year - 1984
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(84)80916-3
Subject(s) - chemistry , electrochromism , stoichiometry , oxygen , absorption (acoustics) , charge (physics) , proton , water splitting , oxygen evolution , photochemistry , electron , analytical chemistry (journal) , chemical physics , physics , electrochemistry , optics , biochemistry , electrode , catalysis , organic chemistry , quantum mechanics , photocatalysis , chromatography
After dark adaptation of oxygen‐evolving PS II complexes, oscillatory absorption changes (stable > 0.5 s) with a periodicity of 4 were detected at 514 nm. They have been correlated with the four oxidation states of the water‐splitting enzyme system S. Supposing that the changes are due to electrochromic shifts, they might indicate a positive surplus charge in states S 2 and S 3 . This means that the electron release pattern 1:1:1:1 is accompanied by a pattern of charge formation 0: + : + : 0 and an intrinsic proton release stoichiometry 1:0:1:2 for the transitions S o →S 1 , S 1 →S 2 , S 2 →S 3 , S 3 →S 0 .