Direct assignment of vitamin K sub 1 as the secondary acceptor A sub 1 in photosystem I

The characteristic electron spin polarized electron paramagnetic resonance (ESP EPR) signal observed in photosystem I (PSI) has been previously assigned to a radical pair composed of the oxidized primary donor and a reduced vitamin K{sub 1}. Under conditions in which Bottin, H. and Setif, P. propose...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 1991-11, Vol.88:21
Main Authors: Snyder, S.W., Thurnauer, M.C., Rustandi, R.R., Norris, J.R., Biggins, J.
Format: Article
Language:English
Subjects:
140505 - Solar Energy Conversion- Photochemical, Photobiological, & Thermochemical Conversion- (1980-)
AROMATICS
CHEMICAL REACTIONS
COAGULANTS
DRUGS
ELECTRON SPIN RESONANCE
ENERGY SPECTRA
FOOD
HEMATOLOGIC AGENTS
HEPARIN ANTAGONISTS
MAGNETIC RESONANCE
MAGNOLIOPHYTA
MAGNOLIOPSIDA
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PHOTOSYNTHETIC REACTION CENTERS
PLANTS
QUINONES
RADICALS
RESONANCE
SOLAR ENERGY
SPECTRA
SPINACH
SYNTHESIS
VEGETABLES
VITAMIN K
VITAMINS
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Description
Summary:The characteristic electron spin polarized electron paramagnetic resonance (ESP EPR) signal observed in photosystem I (PSI) has been previously assigned to a radical pair composed of the oxidized primary donor and a reduced vitamin K{sub 1}. Under conditions in which Bottin, H. and Setif, P. proposed that A{sub 1}, is doubly reduced, the ESP EPR signal was not observed. Therefore, the ESP EPR signal can be directly attributed to A{sub 1}{sup {minus}}, and vitamin K{sub 1} can be assigned as this PSI acceptor. The ESP EPR signal was partially restored by removal of the chemical reductants.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.88.21.9895