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Photoreduction of silicomolybdate in chloroplasts by agents accelerating the deactivation reactions of the water‐oxidizing system
Author(s) -
Samuilov Vitaly D.,
Barsky Eugene L.,
Gubanova Olga N.,
Klimov Vyacheslav V.,
Kozlov Yury N.
Publication year - 1995
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(94)01309-o
Subject(s) - oxidizing agent , chemistry , chloroplast , photosystem ii , redox , photochemistry , cyclic voltammetry , photosynthesis , electron transport chain , photosystem i , electrochemistry , inorganic chemistry , biochemistry , organic chemistry , electrode , gene
Uncouplers of photosynthetic phosphorylation, CCCP, TTFB and PCP, inhibited light‐induced O 2 evolution in the Hill reaction with SiMo ( I 50 ∼20, 3 and 45 μ M, respectively), but only insignificantly diminished SiMo photoreduction by pea chloroplasts. The same properties were exhibited by the ADRY agent ANT2p. CCCP, TTFB and PCP are oxidizable compounds with redox potentials of +1.17, +1.18 and +1.09 V (pH 6.0), as determined by cyclic voltammetry. Similarly to NH 2 OH, the tested uncouplers can apparently serve as electron donors for photosystem II.