DOI: 10.1111/j.1432-1033.1975.tb02200.x. The Properties of Cytochrome <i>f</i> and P700 in Chloroplasts Suspended in Fluid Media at Sub‐zero Temperatures

The Properties of Cytochrome f and P700 in Chloroplasts Suspended in Fluid Media at Sub‐zero Temperatures

10.1111/j.1432-1033.1975.tb02200.x

Crossref journal-article

Wiley

European Journal of Biochemistry (311)

Abstract

The properties of P700 and cytochrome f have been studied at sub‐zero temperatures in chloroplasts suspended in a medium containing 50% (v/v) ethylene glycol. The dark reduction of these components after a period of illumination provided information about the rate‐limiting step of photosynthetic electron transport under these conditions. The oxidation of P700 on illumination in the presence of methyl viologen and its subsequent dark reduction can be observed at −35°C. This cycle of reactions could be repeated many times. The rate of reduction was increased by NH4Cl and reduction was inhibited by 3(3,4‐dichloro‐phenyl)‐1,1‐dimethylurea. The oxidation and reduction of cytochrome f could also be observed under similar conditions. The activation energies for the reduction of cytochrome f and P700 are similar (about 75 kJ mol−1) and the reduction of cytochrome f is also inhibited by dichlorophenyldimethylurea and stimulated by NH4Cl. The reduction of both cytochrome f and P700 seemed to follow first‐order kinetics, but the t1/2 for the reduction of the cytochrome was at least three times that for the reduction of P700 at the same temperature. It was concluded that the results were only compatible with a model in which the main pathway of electrons from plastoquinone to P700 involved cytochrome f if the equilibrium constant between the cytochrome and P700 was very much less than that expected from their redox potentials.

Bibliography

COX, R. P. (1975). The Properties of Cytochrome f and P700 in Chloroplasts Suspended in Fluid Media at Subâzero Temperatures. European Journal of Biochemistry, 55(3), 625â631. Portico.

Authors 1

Raymond P. COX (first)

References 24 Referenced 20

{'key': 'e_1_2_1_2_2', 'volume-title': 'Biochim. Biophys. Acta', 'author': 'Cox R. P.', 'year': '1975'} / Biochim. Biophys. Acta by Cox R. P. (1975)
10.1016/0005-2728(68)90160-6
10.1016/0005-2728(74)90028-0
{'key': 'e_1_2_1_5_2', 'first-page': '557', 'volume-title': 'Proceedings of the Third International Congress on Photosynthesis', 'author': 'Haehnel W.', 'year': '1975'} / Proceedings of the Third International Congress on Photosynthesis by Haehnel W. (1975)
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{'key': 'e_1_2_1_12_2', 'volume-title': 'Biochim. Biophys. Acta', 'author': 'Bouges‐Bocquet B.', 'year': '1975'} / Biochim. Biophys. Acta by Bouges‐Bocquet B. (1975)
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Dates

Type	When
Created	20 years, 5 months ago (March 3, 2005, 10:59 a.m.)
Deposited	1 year, 10 months ago (Oct. 7, 2023, 2:19 a.m.)
Indexed	11 months, 3 weeks ago (Sept. 2, 2024, 5:09 a.m.)
Issued	50 years, 1 month ago (July 1, 1975)
Published	50 years, 1 month ago (July 1, 1975)
Published Online	17 years, 1 month ago (June 28, 2008)
Published Print	50 years, 1 month ago (July 1, 1975)

Funders 0

None

BibTeX

@article{COX_1975, title={The Properties of Cytochrome f and P700 in Chloroplasts Suspended in Fluid Media at Sub‐zero Temperatures}, volume={55}, ISSN={1432-1033}, url={http://dx.doi.org/10.1111/j.1432-1033.1975.tb02200.x}, DOI={10.1111/j.1432-1033.1975.tb02200.x}, number={3}, journal={European Journal of Biochemistry}, publisher={Wiley}, author={COX, Raymond P.}, year={1975}, month=jul, pages={625–631} }

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