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Univalent Reduction of Molecular Oxygen by Spinach Chloroplasts on Illumination
Open accessAbstract
Spinach chloroplasts induced the photoreduction of cytochrome c and photooxidation of epinephrine, both of which depended on oxygen and were inhibited by superoxide dismutase.This confirmed the univalent reduction of molecular oxygen in illuminated chloroplasts.In the presence of cytochrome c, hydrogen peroxide formation by chloroplasts was inhibited completely.Rates for the photoreduction of cytochrome c and the formation of hydrogen peroxide were equivalent, indicating that the univalent reduction of oxygen is a part of the Mehler reaction and the divalent reduction of oxygen is absent in chloroplasts.Spinach ferredoxin, cytochrome c-reducing substance, and phenazine methosulfate did not stimulate or decrease the superoxide dismutase-inhibited rates of the photoreduction of cytochrome c and photo-oxidation of epinephrine.Chloroplasts treated with histone, which blocked Photosystem I, could not photooxidize epinephrine.Thus, we propose that the univalent reducing site of oxygen is a primary electron acceptor in Photosystem I.
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Cites
Superoxide dismutase: Improved assays and an assay applicable to acrylamide gels
Beauchamp, C., & Fridovich, I. (1971) · Analytical Biochemistry · doi:10.1016/0003-2697(71)90370-8 · Cited by 12,892
Cited by
Hydrogen Peroxide is Scavenged by Ascorbate-specific Peroxidase in Spinach Chloroplasts
Nakano, Y., & Asada, K. (1981) · Plant and Cell Physiology · doi:10.1093/oxfordjournals.pcp.a076232 · Cited by 10,809
Self-citationProduction and Scavenging of Reactive Oxygen Species in Chloroplasts and Their Functions
Asada, K. (2006) · Plant Physiology · doi:10.1104/pp.106.082040 · Cited by 2,752
Self-citationROS and RNS in plant physiology: an overview
del Río, L. A. (2015) · Journal of Experimental Botany · doi:10.1093/jxb/erv099 · Cited by 657
The wanderings of a free radical
Halliwell, B. (2009) · Free Radical Biology and Medicine · doi:10.1016/j.freeradbiomed.2008.11.008 · Cited by 467
Okuda, T., Matsuda, Y., Yamanaka, A., & Sagisaka, S. (1991) · Plant Physiology · doi:10.1104/pp.97.3.1265 · Cited by 458
Metadata
- Authors
- Asada, K., Kiso, K., & Yoshikawa, K.
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 1974-04
- Volume
- 249
- Issue
- 7
- Pages
- 2175-2181
- ISSN
- 0021-9258 (ISSN-L)
- OpenAlex
- W2099828606
- Cited by
- 316
- References
- 1
- FWCI
- 3.26
- Type
- journal article
- Language
- en
- Open access
- hybrid
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- Asada, K., Kiso, K., & Yoshikawa, K. (1974). Univalent Reduction of Molecular Oxygen by Spinach Chloroplasts on Illumination. Journal of Biological Chemistry. https://doi.org/10.1016/s0021-9258(19)42815-9
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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