Rates of primary electron transfer reactions in the photosystem I reaction center reconstituted with different quinones as the secondary acceptor

Journal Article · Thu Oct 27 00:00:00 EDT 1994 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100094a033· OSTI ID:6735630

Kumazaki, Shigeichi; Kandori, Hideki; Yoshihara, Keitaro ^[1]; Iwaki, Masayo; Itoh, Shigeru ^[2]; Ikegamu, Isamu ^[3]

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1. Inst. for Molecular Science, Okazaki (Japan)
2. National Inst. for Basic Biology, Okazaki (Japan)
3. Teikyo Univ., Kanagawa (Japan)

Rates of sequential electron transfer reactions from the primary electron donor chlorophyll dimer (P700) to the electron acceptor chlorophyll a-686 (A[sub 0]) and to the secondary acceptor quinone (Q[sub [phi]]) are measured by picosecond absorption spectroscopy in spinach photosystem I (PS I) particles. In the particles, 85-90% of antenna chlorophylls are extracted and the intrinsic phylloquinone (Q[sub [phi]]) is removed and replaced by different quinones. (1) The excited single state of P700, monitored by the absorbance change at 695 nm, appeared with a time constant shorter than 1 ps after excitation with a 605 nm, 1 ps pulse at an intensity of 0.8 or 1.5 photons/reaction center. Indication for the absorbance change of the chlorophylls, which may function as the intermediate electron acceptor between P700 and A[sub 0] or between A[sub 0] and Q[sub [phi]], was not obtained. 45 refs., 5 figs., 1 tab.

• OSTI ID: 6735630
• Journal Information: Journal of Physical Chemistry; (United States), Vol. 98:43; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
14 SOLAR ENERGY
CHLOROPHYLL
EXCITATION
EXCITED STATES
PHOTOSYNTHETIC REACTION CENTERS
ELECTRON TRANSFER
ABSORPTION SPECTROSCOPY
BACTERIA
CHEMICAL REACTION KINETICS
MATHEMATICAL MODELS
QUINONES
SPINACH
AROMATICS
CARBOXYLIC ACIDS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
FOOD
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
KINETICS
MAGNOLIOPHYTA
MAGNOLIOPSIDA
MICROORGANISMS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PHYTOCHROMES
PIGMENTS
PLANTS
PORPHYRINS
PROTEINS
REACTION KINETICS
SPECTROSCOPY
VEGETABLES
400500* - Photochemistry
140505 - Solar Energy Conversion- Photochemical
Photobiological
& Thermochemical Conversion- (1980-)
400201 - Chemical & Physicochemical Properties