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

Journal Article · Fri Nov 01 04:00:00 EST 1991 · Proceedings of the National Academy of Sciences of the United States of America; (United States)

DOI:https://doi.org/10.1073/pnas.88.21.9895· OSTI ID:5731840

Snyder, S W; Thurnauer, M C ^[1]; Rustandi, R R; Norris, J R ^[2]; Biggins, J ^[3]

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1. Argonne National Lab., IL (United States)
2. Argonne National Lab., IL (United States) Univ. of Chicago, IL (United States)
3. Brown Univ., Providence, RI (United States)

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.

• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5731840
• Journal Information: Proceedings of the National Academy of Sciences of the United States of America; (United States), Journal Name: Proceedings of the National Academy of Sciences of the United States of America; (United States) Vol. 88:21; ISSN 0027-8424; ISSN PNASA
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
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
SPECTRA
SPINACH
SYNTHESIS
VEGETABLES
VITAMIN K
VITAMINS