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Spectroscopic resolution of the picosecond reduction kinetics of the secondary electron acceptor A 1 in photosystem I
Author(s) -
Brettel Klaus,
H. Vos Marten
Publication year - 1999
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/s0014-5793(99)00317-8
Subject(s) - p700 , picosecond , electron transfer , photochemistry , ultrafast laser spectroscopy , chemistry , electron acceptor , acceptor , photosystem i , kinetics , photosystem ii , light harvesting complexes of green plants , spectroscopy , electron donor , absorption spectroscopy , analytical chemistry (journal) , photosynthesis , optics , catalysis , physics , laser , biochemistry , chromatography , quantum mechanics , condensed matter physics
Forward electron transfer in photosystem I from Synechocystis sp. PCC 6803 has been studied in the picosecond time range with transient absorption spectroscopy in the blue and near‐UV spectral regions. From the direct measurement, at 380–390 nm, of the reduction kinetics of the phylloquinone secondary acceptor A 1 and from the absence of spectral evolution between 100 ps and 2 ns, we conclude that electron transfer, from the chlorophyll a primary acceptor A 0 , to A 1 occurs directly and completely with a time constant of about 30 ps.