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Light-Induced Structural Changes in Photosynthetic Reaction Center: Implications for Mechanism of Electron-Proton Transfer
Abstract
High resolution x-ray diffraction data from crystals of the Rhodobacter sphaeroides photosynthetic reaction center (RC) have been collected at cryogenic temperature in the dark and under illumination, and the structures were refined at 2.2 and 2.6 angstrom resolution, respectively. In the charge-separated D + Q A Q B − state (where D is the primary electron donor (a bacteriochlorophyll dimer), and Q A and Q B are the primary and secondary quinone acceptors, respectively), Q B − is located approximately 5 angstroms from the Q B position in the charge-neutral (DQ A Q B ) state, and has undergone a 180° propeller twist around the isoprene chain. A model based on the difference between the two structures is proposed to explain the observed kinetics of electron transfer from Q A − Q B to Q A Q B − and the relative binding affinities of the different ubiquinone species in the Q B pocket. In addition, several water channels (putative proton pathways) leading from the Q B pocket to the surface of the RC were delineated, one of which leads directly to the membrane surface.
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Citations
Cited by
Stubbe, J., Nocera, D. G., Yee, C. S., & Chang, M. C. Y. (2003) · Chemical Reviews · doi:10.1021/cr020421u · Cited by 823
Charge separation in Photosystem II: A comparative and evolutionary overview
Cardona, T., Sedoud, A., Cox, N., & Rutherford, A. W. (2012) · Biochimica et Biophysica Acta (BBA) - Bioenergetics · doi:10.1016/j.bbabio.2011.07.012 · Cited by 364
Walshaw, J., & Woolfson, D. N. (2001) · Journal of Molecular Biology · doi:10.1006/jmbi.2001.4545 · Cited by 357
Structure at 0.85 Å resolution of an early protein photocycle intermediate
Genick, U. K., Soltis, S. M., Kuhn, P., Canestrelli, I. L., & Getzoff, E. D. (1998) · Nature · doi:10.1038/32462 · Cited by 311
Self-citationHorsefield, R., Yankovskaya, V., Sexton, G., Whittingham, W., Shiomi, K., Ōmura, S., Byrne, B., Cecchini, G., & Iwata, S. (2006) · Journal of Biological Chemistry · doi:10.1074/jbc.m508173200 · Cited by 292
Metadata
- Authors
- Stowell, M. H. B., McPhillips, T. M., Rees, D. C., Soltis, S. M., Abresch, E., & Feher, G.
- Venue
- Science
- Published
- 1997-05-02
- Volume
- 276
- Issue
- 5313
- Pages
- 812-816
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W1973040844
- Cited by
- 725
- References
- 0
- FWCI
- 14.96
- Type
- journal article
- Language
- en
- Open access
- closed
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- Stowell, M. H. B., McPhillips, T. M., Rees, D. C., Soltis, S. M., Abresch, E., & Feher, G. (1997). Light-Induced Structural Changes in Photosynthetic Reaction Center: Implications for Mechanism of Electron-Proton Transfer. Science. https://doi.org/10.1126/science.276.5313.812
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
