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Separate photosensitizers mediate degradation of the 32-kDa photosystem II reaction center protein in the visible and UV spectral regions.
Open accessAbstract
A component of the photosystem II reaction center, the 32-kDa protein, is rapidly turned over in the light. The mechanism of its light-dependent metabolism is largely unknown. We quantified the rate of 32-kDa protein degradation over a broad spectral range (UV, visible, and far red). The quantum yield for degradation was highest in the UVB (280-320 nm) region. Spectral evidence demonstrates two distinctly different photosensitizers for 32-kDa protein degradation. The data implicate the bulk photosynthetic pigments (primarily chlorophyll) in the visible and far red regions, and plastoquinone (in one or more of its redox states) in the UV region. A significant portion of 32-kDa protein degradation in sunlight is attributed to UVB irradiance.
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Citations
Cited by
The role of the xanthophyll cycle and of lutein in photoprotection of photosystem II
Jahns, P., & Holzwarth, A. R. (2012) · Biochimica et Biophysica Acta (BBA) - Bioenergetics · doi:10.1016/j.bbabio.2011.04.012 · Cited by 1,084
Effects of UV-B radiation on photosynthesis and growth of terrestrial plants
Teramura, A. H., & Sullivan, J. H. (1994) · Photosynthesis Research · doi:10.1007/bf00014599 · Cited by 490
THE ROLE AND EVOLUTION OF SUPEROXIDE DISMUTASES IN ALGAE1
Wolfe‐Simon, F., Grzebyk, D., Schofield, O., & Falkowski, P. G. (2005) · Journal of Phycology · doi:10.1111/j.1529-8817.2005.00086.x · Cited by 239
Metadata
- Authors
- Greenberg, B. M., Gaba, V, Canaani, O., Malkin, S., Mattoo, A. K., & Edelman, M.
- Venue
- Proceedings of the National Academy of Sciences
- Published
- 1989-09
- Volume
- 86
- Issue
- 17
- Pages
- 6617-6620
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- OpenAlex
- W2021978270
- Cited by
- 304
- References
- 0
- FWCI
- 4.59
- Type
- journal article
- Language
- en
- Open access
- green
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- CoChat. (2026). Citation check: Separate photosensitizers mediate degradation of the 32-kDa photosystem II reaction center protein in the visible and UV spectral regions. https://app.cochat.ai/papers/10.1073/pnas.86.17.6617
- The paper
- Greenberg, B. M., Gaba, V, Canaani, O., Malkin, S., Mattoo, A. K., & Edelman, M. (1989). Separate photosensitizers mediate degradation of the 32-kDa photosystem II reaction center protein in the visible and UV spectral regions. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.86.17.6617
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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.
