Oxygen Stress and Superoxide Dismutases

@inproceedings{Scandalios1993OxygenSA,
  title={Oxygen Stress and Superoxide Dismutases},
  author={J. G. Scandalios},
  booktitle={Plant physiology},
  year={1993}
}
The accumulation of dioxygen in Earth's atmosphere allowed for the evolution of aerobic organisms that use O2 as the terminal electron acceptor, thus providing a higher yield of energy compared with fermentation and anaerobic respiration. For example, in aerobic metabolism, the complete breakdown of one molecule of glucose yields a total of 38 molecules of ATP, whereas the anaerobic breakdown of this same glucose molecule to ethanol and CO, yields only 8 ATPs. In its ground state, molecular O2… Expand
The effect of elevated glutathione reductase and superoxide dismutase activities in stressed transgenic tobacco.
TLDR
This study evaluated plants carrying elevated levels of two of the enzymes of the antioxidant system for their ability to tolerate oxidative stress by treating them with paraquat a herbicide whose mode of action involves the production of large quantities of activated oxygen. Expand
PLANT MITOCHONDRIA AND OXIDATIVE STRESS: Electron Transport, NADPH Turnover, and Metabolism of Reactive Oxygen Species.
  • I. Møller
  • Biology, Medicine
  • Annual review of plant physiology and plant molecular biology
  • 2001
TLDR
The alternative oxidase and possibly NDin(NADH) function to limit mitochondrial ROS production by keeping the ETC relatively oxidized, together with small antioxidants such as glutathione, that help remove ROS. Expand
Molecular Responses to Oxidative Stress
The evolution of oxygenic photosynthesis altered the Earth’s atmosphere and enabled the development and sustenance of aerobic life. Thus, molecular oxygen is essential for life on Earth. However, theExpand
Photooxidative stress in plants
The light-dependent generation of active oxygen species is termed photooxidative stress. This can occur in two ways: (1) the donation of energy or electrons directly to oxygen as a result ofExpand
The Iron-Containing Superoxide Dismutase of Rhodobacter Capsulatus is Essential for Aerobic Viability
Rhodobacter capsulatus is a purple phototrophic bacterium that, in the presence of light and under low oxygen tensions, synthesises ATP through an anoxygenic electron transport around a singleExpand
Superoxide Dismutase in Plants
TLDR
In plants, three forms of the enzyme exist, as classified by their active site metal ion: copper/zinc, manganese, and iron forms, and it is only in plants that all three different types of SOD coexist. Expand
Protection against oxygen radicals: an important defence mechanism studied in transgenic plants
Free radicals and other active derivatives of oxygen are inevitable by-products of biological redox reactions. Reduced oxygen species, such as hydrogen peroxide, the superoxide radical anion andExpand
Role of Superoxide Dismutases (SODs) in Stress Tolerance in Plants
The plants get exposed to different abiotic stresses and pathogen attack due to their sessile nature. These stresses result in the overproduction of reactive oxygen species (ROS) such as superoxideExpand
Oxidative stress induced by lead in chloroplast of spinach.
TLDR
Increase in both ROS and lipid peroxide content and reduction in photosynthesis and activities of the antioxidant defense system indicated that spinach chloroplast underwent a stress condition due to an oxidative attack. Expand
Impact of oxygen stress and energy availability on membrane stability of plant cells.
This article reviews the relationship between the energy status of plant cells under O(2) stress (e.g. waterlogging) and the maintenance of membrane intactness, using information largely derived fromExpand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 45 REFERENCES
Photooxidative stress in plants
The light-dependent generation of active oxygen species is termed photooxidative stress. This can occur in two ways: (1) the donation of energy or electrons directly to oxygen as a result ofExpand
Light-induced production of singlet oxygen and superoxide by the fungal toxin, cercosporin.
TLDR
It is found that cercosporin, when activated by light in the presence of oxygen, is able to generate both singlet oxygen and superoxide ions. Expand
Superoxide dismutase. An enzymic function for erythrocuprein (hemocuprein).
TLDR
The demonstration that O2·- can reduce ferricytochrome c and tetranitromethane, and that superoxide dismutase, by competing for the superoxide radicals, can markedly inhibit these reactions, is demonstrated. Expand
Effect of the free radical-generating herbicide paraquat on the expression of the superoxide dismutase (Sod) genes in maize.
TLDR
Isolation and in vitro translation of polysomes from 10(-5) M paraquat-treated leaves indicated that paraquats increased the amount ofpolysomal mRNA which codes for S OD-4 and SOD-3, which indicates that the effect of these compounds on the expression of the maize Sod genes is exerted via their ability to generate superoxide. Expand
Differential response of maize catalases and superoxide dismutases to the photoactivated fungal toxin cercosporin
TLDR
A system is presented for analysis of antioxidant defense gene response using purified cercosporin under conditions demonstrated to favor superoxide formation, and it is indicated that protein turnover might play a role in the response of these SODs to activated oxygen species. Expand
Molecular genetics of superoxide dismutases in yeasts and related fungi.
TLDR
This chapter provides information on various enzymes that are responsible for the establishing themselves as first component of defense mechanism, such as the superoxide dismutases in eukaryotes, which are catalytically equivalent but evolutionarily, genetically, and structurally distinct. Expand
THE QUENCHING OF SINGLET OXYGEN BY AMINO ACIDS AND PROTEINS
TLDR
The rate of quenched by most of the proteins studied is approximated by the sum of the quenching rates of their amino acids histidine, tryptophan and methionine, which implies that these amino acids in the protein structure are all about equally accessible to the singlet oxygen. Expand
Singlet oxygen and plants
Abstract The generation, occurrence and action of singlet oxygen in plant tissue is reviewed. Particular emphasis is placed upon its formation from triplet sensitizers and its reactivity withExpand
Inactivation of key metabolic enzymes by mixed-function oxidation reactions: possible implication in protein turnover and ageing.
TLDR
It is suggested that mixed-function oxidation system-catalyzed inactivation of enzymes is a regulatory step in enzyme turn-over and the implication of oxidative inactivation reactions in ageing is suggested by the fact that many of the enzymes inactivated by mixed- function oxidation systems are known to accumulate as inactive forms during ageing. Expand
Purification and characterization of an iron-containing superoxide dismutase from a eucaryote, Ginkgo biloba.
  • M. Duke, M. Salin
  • Chemistry, Medicine
  • Archives of biochemistry and biophysics
  • 1985
TLDR
The enzyme from Ginkgo was most similar to iron superoxide dismutases of Nuphar, Brassica, and Escherichia coli when compared on the basis of S delta Q analysis of amino acid composition; similar-sized fragments which denote possible areas of homology were observed. Expand
...
1
2
3
4
5
...