Primary electron acceptors in plant photosynthesis

Journal Article · Tue Nov 04 23:00:00 EST 1980 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00543a062· OSTI ID:6605085

Fajer, J ^[1]; Davis, M S; Forman, A; Klimov, V V; Dolan, E; Ke, B

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1. Brookhaven National Lab., Upton, NY

Results of electron spin resonance and electron nuclear double resonance are presented which establish that in subchloroplast fragments enriched in photosystem II reaction centers, the trapped primary electron acceptor exhibits magnetic characteristics very similar to those of the monomeric anion radical of pheophytin A (Pheo) in vitro. In addition the mid-point potential and the optical changes that accompany the reduction of the intermediary acceptor in vivo closely parallel those observed for monomeric Pheo in vitro. It was concluded that pheophytin A is the most likely candidate as the primary electron acceptor of charge separation induced by light in the photosystem II of plant photosynthesis. (DMC)

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6605085
• Journal Information: J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 102:23; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

550200* -- Biochemistry
59 BASIC BIOLOGICAL SCIENCES
BINDING ENERGY
CARBOXYLIC ACIDS
CELL CONSTITUENTS
CHEMICAL REACTIONS
CHLOROPHYLL
CHLOROPLASTS
DATA
ELECTRON SPIN RESONANCE
ELECTRON TRANSFER
ELECTRONS
ELEMENTARY PARTICLES
ENDOR
ENERGY
EXPERIMENTAL DATA
FERMIONS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
IN VITRO
INFORMATION
LEPTONS
MAGNETIC RESONANCE
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOSYNTHESIS
PHYTOCHROMES
PIGMENTS
PLANTS
PORPHYRINS
REACTION INTERMEDIATES
RESONANCE
SYNTHESIS
VALENCE