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

Abstract

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.

Authors:
; ;  [1]; ;  [2];  [3]
  1. Inst. for Molecular Science, Okazaki (Japan)
  2. National Inst. for Basic Biology, Okazaki (Japan)
  3. Teikyo Univ., Kanagawa (Japan)
Publication Date:
OSTI Identifier:
6735630
Resource Type:
Journal Article
Journal Name:
Journal of Physical Chemistry; (United States)
Additional Journal Information:
Journal Volume: 98:43; Journal ID: ISSN 0022-3654
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Kumazaki, Shigeichi, Kandori, Hideki, Yoshihara, Keitaro, Iwaki, Masayo, Itoh, Shigeru, and Ikegamu, Isamu. Rates of primary electron transfer reactions in the photosystem I reaction center reconstituted with different quinones as the secondary acceptor. United States: N. p., 1994. Web. doi:10.1021/j100094a033.
Kumazaki, Shigeichi, Kandori, Hideki, Yoshihara, Keitaro, Iwaki, Masayo, Itoh, Shigeru, & Ikegamu, Isamu. Rates of primary electron transfer reactions in the photosystem I reaction center reconstituted with different quinones as the secondary acceptor. United States. https://doi.org/10.1021/j100094a033
Kumazaki, Shigeichi, Kandori, Hideki, Yoshihara, Keitaro, Iwaki, Masayo, Itoh, Shigeru, and Ikegamu, Isamu. 1994. "Rates of primary electron transfer reactions in the photosystem I reaction center reconstituted with different quinones as the secondary acceptor". United States. https://doi.org/10.1021/j100094a033.
@article{osti_6735630,
title = {Rates of primary electron transfer reactions in the photosystem I reaction center reconstituted with different quinones as the secondary acceptor},
author = {Kumazaki, Shigeichi and Kandori, Hideki and Yoshihara, Keitaro and Iwaki, Masayo and Itoh, Shigeru and Ikegamu, Isamu},
abstractNote = {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.},
doi = {10.1021/j100094a033},
url = {https://www.osti.gov/biblio/6735630}, journal = {Journal of Physical Chemistry; (United States)},
issn = {0022-3654},
number = ,
volume = 98:43,
place = {United States},
year = {Thu Oct 27 00:00:00 EDT 1994},
month = {Thu Oct 27 00:00:00 EDT 1994}
}