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Identification of multiple components in the intermediary electron carrier complex of photosystem I
Author(s) -
Bonnerjea J.,
Evans M.C.W.
Publication year - 1982
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(82)80831-4
Subject(s) - p700 , photosystem i , dithionite , electron paramagnetic resonance , electron transfer , chemistry , photochemistry , electron , photosynthetic reaction centre , electron acceptor , photosystem ii , analytical chemistry (journal) , nuclear magnetic resonance , physics , photosynthesis , biochemistry , quantum mechanics , chromatography , enzyme
Illumination at 230 K of dithionite‐reduced particles results in the appearance of an EPR detectable radical 13 G wide with g = 2.0033. This radical is formed in a ratio of 2.28 (±0.5)/P700. Investigation of the time course of formation shows two components are present. One ( A 1 ) has g = 2.0051 and the other ( A o g = 2.0024. Reduction of A 1 results in an increase in reaction centre triplet formation, subsequent reduction of A o results in a decrease of triplet formation to the base level. We propose that these components function sequentially in the transfer of electrons from P700 to the iron—sulphur acceptors.