Optical and kinetic properties of semireduced plastoquinone and ubiquinone: electron acceptors in photosynthesis.
作者： R. Bensasson , E.J. Land
DOI: 10.1016/0005-2728(73)90163-1
关键词:
摘要: Abstract 1. Semiquinone anion minus quinone (Q − -Q) and neutral semiquinone (QH-Q) difference spectra have been measured for plastoquinone-9, ubiquinone-10 ubiquinone-0, using pulse radiolysis in methanolic solution. The were used to determine the absolute of each semiquinone. 2. spectrum plastoquinone-9 is similar detected at a time less than 20 ns after flash excitation photosynthetic light reaction Photosystem II spinach chloroplasts [Stiehl, H. Witt, T., (1968) Z. Naturforsch. 23b, 220–224; T. (1971) Q. Rev. Biophys. 4, 365–477]. 3. ubiquinone Q -Q are found on illumination centre preparations from Rhodopseudomonas spheroides Rhodospirillum rubrum [Slooten, L. (1972) Biochim. Acta 275, 208–218; Clayton, R. K. Straley, S. C. Biophys , J. 12, 1221–1234]. Ubiquinone has suggested be closely associated with primary electron acceptor bacterial photosynthesis. 4. Rate constants formation semiquinones by e staggered− staggeredCH 3 OH ĊH 2 O quinone, decays semiquinones. anions stable seconds. ubisemiquinone-6 reacts only slowly oxygen, k ≈ 10 M −1 · s . 5. effect substituents upon physicochemical properties discussed.
openrepository.com
elsevier.com
sci-hub.se 参考文章(15)
Roderick K. Clayton, Susan C. Straley, Photochemical Electron Transport in Photosynthetic Reaction Centers: IV. Observations Related to the Reduced Photoproducts Biophysical Journal. ,vol. 12, pp. 1221- 1234 ,(1972) , 10.1016/S0006-3495(72)86158-7
R. P. F. Gregory, Biochemistry of photosynthesis ,(1971)
E.J. Land, A.J. Swallow, One-Electron Reactions in Biochemical Systems As Studied by Pulse Radiolysis III. UBIQUINONE Journal of Biological Chemistry. ,vol. 245, pp. 1890- 1894 ,(1970) , 10.1016/S0021-9258(18)63182-5
E. M. Fielden, E. J. Hart, Activation energy of the hydrated electron + water reaction and the ultra-violet absorption spectrum of the hydrated electron Transactions of The Faraday Society. ,vol. 63, pp. 2975- 2982 ,(1967) , 10.1039/TF9676302975
E.J. Land, M. Simic, A.J. Swallow, Optical absorption spectrum of half-reduced ubiquinone Biochimica et Biophysica Acta (BBA) - Bioenergetics. ,vol. 226, pp. 239- 240 ,(1971) , 10.1016/0005-2728(71)90091-0
R. BENSASSON, C. CHACHATY, E. J. LAND, C. SALET, Nanosecond irradiation studies of biological molecules. I. Coenzyme Q 6 (ubiquinone-30). Photochemistry and Photobiology. ,vol. 16, pp. 27- 37 ,(1972) , 10.1111/J.1751-1097.1972.TB06276.X
J P Keene, PULSE RADIOLYSIS APPARATUS Journal of Scientific Instruments. ,vol. 41, pp. 493- 496 ,(1964) , 10.1088/0950-7671/41/8/302
L. Slooten, Electron acceptors in reaction center preparations from photosynthetic bacteria Biochimica et Biophysica Acta. ,vol. 275, pp. 208- 218 ,(1972) , 10.1016/0005-2728(72)90042-4
J. H. Baxendale, F. W. Mellows, The γ-Radiolysis of Methanol and Methanol Solutions Journal of the American Chemical Society. ,vol. 83, pp. 4720- 4726 ,(1961) , 10.1021/JA01484A007
G. Feher, M.Y. Okamura, J.D. McElroy, Identification of an electron acceptor in reaction centers of Rhodopseudomonas spheroides by EPR spectroscopy Biochimica et Biophysica Acta (BBA) - Bioenergetics. ,vol. 267, pp. 222- 226 ,(1972) , 10.1016/0005-2728(72)90155-7