Abstract
The influence of duration of exposure to actinic light (from 1 sec to 10 min) and temperature (from 3 to 35°C) on the temporary stabilization of the photomobilized electron in the secondary quinone acceptor (QB) locus of Rhodobacter sphaeroides reaction centers (RC) was studied under aerobic or anaerobic conditions. Optical spectrophotometry and ESR methods were used. The stabilization time increased significantly upon increasing the exposure duration under aerobic conditions. The stabilization time decreased under anaerobic conditions, its dependence on light exposure duration being significantly less pronounced. Generation of superoxide radical in photoactivated aerobic samples was revealed by the ESR method. Possible interpretation of the effects is suggested in terms of interaction between the semiquinone QB with oxygen, the interaction efficiency being determined by the conformational transitions in the structure of RC triggered by actinic light on and off.
Similar content being viewed by others
REFERENCES
Remennikov, V. G., and Samuilov, V. D. (1980) Dokl. Akad. Nauk SSSR, 252, 491–494.
Okamura, M. Y., and Feher, G. (1992) Annu. Rev. Biochem., 61, 861–896.
Lancaster, C. R. D., Michel, H., Honig, B., and Gunner, M. R. (1996) Biophys. J., 70, 2469–2492.
Miksovska, J., Maroti, P., Tandori, J., Schiffer, M., Hanson, D. K., and Sebban, P. (1996) Biochemistry, 35, 15411–15417.
Stowell, M. H. B., McPhillips, T. M., Rees, D. C., Soltis, S. M., Abresch, E., and Feher, G. (1997) Science, 276, 812–816.
Abgaryan, G. A., Goushcha, A. O., Kapustina, M. T., Kononenko, A. A., Knox, P. P., and Kharkyanen, V. N. (1997) Biofizika, 42, 1088–1093.
Abgaryan, G. A., Christophorov, L. N., Goushcha, A. O., Holzwarth, A. R., Kharkyanen, V. N., Knox, P. P., and Lukashev, E. P. (1998) J. Biol. Phys., 24, 1–17.
Kalman, L., and Maroti, P. (1997) Biochemistry, 36, 15269–15276.
Pimenova, M. N., Grechushkina, N. N., Azova, L. G., Semenova, E. V., and Myl'nikova, S. I. (1983) Handbook of Practical Microbiology [in Russian], MGU Publishers, Moscow.
Zakharova, N. I., and Churbanova, I. Yu. (2000) Biochemistry (Moscow), 65, 149–159.
Timofeev, K. N., and Shaitan, K. V. (1988) in Modern Methods in Biophysical Research (Rubin, A. B., ed.) [in Russian], Vysshaya Shkola, Moscow, pp. 226–282.
Yu, C.-A., and Yu, L. (1981) Biochim. Biophys. Acta, 639, 99–128.
Muller, R. W., and Mac Dowall, E. D. H. (1975) Biochim. Biophys. Acta, 387, 176–187.
Afanas'ev, I. B. (1984) in Oxygen Radicals in Chemistry and Biology [in Russian], Nauka i Tekhnika, Minsk, pp. 13–20.
Rinyu, L., Meray, N., Nandory, J., Pfeiffer, I., Maroti, P., and Nagy, L. (1998) in Photosynthesis: Mechanisms and Effects (Garab, G., ed.) Vol. 2, Kluwer Academic Publishers, Amsterdam, pp. 833–836.
Takahashi, E., Wells, T. A., and Wraight, C. A. (1998) in Photosynthesis: Mechanisms and Effects (Garab, G., ed.) Vol. 2, Kluwer Academic Publishers, Amsterdam, pp. 853–856.
Shinkarev, V. P., and Wraight, C. A. (1993) in The Photosynthetic Reaction Center (Deisenhofer, J., and Norris, J., eds.) Vol. 1, Academic Press, San Diego, pp. 193–255.
Manring, L. E., Kramer, M. K., and Foote, C. S. (1984) Tetrahedron Lett., 25, 2523–2525.
Kononenko, A. A., Knox, P. P., Chamorovsky, S. K., Rubin, A. B., Likhtenshtein, G. I., Krupyansky, Yu. F., Suzdalev, I. P., and Gol'dansky, V. I. (1986) Khim. Fiz., 5, 795–804.
Slooten, L. (1972) Biochim. Biophys. Acta, 275, 208–218.
(1964) Handbook of Chemistry [in Russian], Vol. 3, Khimiya, Moscow.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Knox, P.P., Lukashev, E.P., Timofeev, K.N. et al. Effects of Oxygen on the Dark Recombination between Photoreduced Secondary Quinone and Oxidized Bacteriochlorophyll in Rhodobacter sphaeroides Reaction Centers. Biochemistry (Moscow) 67, 901–907 (2002). https://doi.org/10.1023/A:1019966620850
Issue Date:
DOI: https://doi.org/10.1023/A:1019966620850