Summary
The mechanisms of action of reactive oxygen species (ROS) in plant and animal cells, in chloroplasts, mitochondria, and other sub-cellular compartments such as the endoplasmic reticulum and nucleus, which result in deleterious effects as well as intra-organelle and metabolically significant signaling reactions, are discussed, as well as physiological effects induced by the signaling functions of ROS. The role of ROS in chloroplast retrograde signaling and modulation of abiotic stress response and pathogen defense is discussed. Attention is focused on mechanisms of ROS production, and particularly on the intra-organelle reactions mediated through reduction of oxygen to superoxide in the mitochondrial cytochrome bc 1 and the chloroplast b 6 f complexes, for which understanding of the mechanistic details is facilitated by the existence of high resolution crystal structures. Attention is directed to the structure-based details that underlie the more than tenfold larger specific rate of superoxide production in the b 6 f complex compared to that of the mitochondrial bc 1 complex. Because plastoquinol oxidation by the cytochrome b 6 f complex is known to initiate chloroplast state transitions, the effect of superoxide on the intra-membrane chlorophyll protein kinase that is integral to the cytochrome b 6 f complex, and which underlies the photosynthetic state transitions that regulate the distribution of light energy between the two photosystems, is considered.
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Abbreviations
- b p, b n :
-
b-type hemes on electrochemically positive, negative sides of membrane
- cyt:
-
Cytochrome
- DBMIB:
-
2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone
- Em :
-
midpoint oxidation-reduction potential
- ET:
-
Electron transport
- Fe-S:
-
Iron-sulfur center
- H2O2 :
-
Hydrogen peroxide
- HPV:
-
Hypoxic pulmonary vasoconstriction
- ISP:
-
Rieske iron-sulfur protein
- LHC:
-
Light harvesting complex
- NQNO:
-
2-n-nonyl-4-hydroxyquinoline N-oxide
- n-, p-side:
-
Electrochemically negative-, positive side of membrane
- 1O2 :
-
Singlet oxygen
- \( {{\mathrm{O}}_2}^{\fontsize{3}{5}\selectfont{\underline {\kern0.24em \bullet \kern0.24em }}} \) :
-
Superoxide
- PC:
-
Plastocyanin
- PEWY:
-
Proline-glutamate-tryptophan-tyrosine
- PQ:
-
Plastoquinone
- PQH2 :
-
Plastoquinol
- PQH:
-
Plastosemiquinone
- \( \mathrm{P}{\mathrm{Q}}^{\fontsize{3}{5}\selectfont{\underline {\kern0.24em \bullet \kern0.24em }}} \) :
-
Anionic plastosemiquinone
- PSI, II:
-
Photosystem I, II
- Qp, Qn :
-
Quinone binding site on p-, n-side of membrane
- ROS:
-
Reactive oxygen species
- TDS:
-
Tridecyl-stigmatellin
- UQ:
-
Ubiquinone
- UQH2 :
-
Ubiquinol
- \( \mathrm{U}{{\mathrm{Q}}_2}^{\fontsize{3}{5}\selectfont{\underline {\kern0.24em \bullet \kern0.24em }}} \) :
-
Anionic ubisemiquinone
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Baniulis, D., Saif Hasan, S., Miliute, I., Cramer, W.A. (2016). Mechanisms of Superoxide Generation and Signaling in Cytochrome bc Complexes. In: Cramer, W., Kallas, T. (eds) Cytochrome Complexes: Evolution, Structures, Energy Transduction, and Signaling. Advances in Photosynthesis and Respiration, vol 41. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-7481-9_20
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