Abstract
Reactive oxygen species (ROS) such as superoxide and hydrogen peroxide are by-products of various metabolic processes in aerobic organisms including Euglena. Chloroplasts and mitochondria are the main sites of ROS generation by photosynthesis and respiration, respectively, through the active electron transport chain. An efficient antioxidant network is required to maintain intracellular ROS pools at optimal conditions for redox homeostasis. A comparison with the networks of plants and animals revealed that Euglena has acquired some aspects of ROS metabolic process. Euglena lacks catalase and a typical selenocysteine containing animal-type glutathione peroxidase for hydrogen peroxide scavenging, but contains enzymes involved in ascorbate-glutathione cycle solely in the cytosol. Ascorbate peroxidase in Euglena, which plays a central role in the ascorbate-glutathione cycle, forms a unique intra-molecular dimer structure that is related to the recognition of peroxides. We recently identified peroxiredoxin and NADPH-dependent thioredoxin reductase isoforms in cellular compartments including chloroplasts and mitochondria, indicating the physiological significance of the thioredoxin system in metabolism of ROS. Besides glutathione, Euglena contains the unusual thiol compound trypanothione, an unusual form of glutathione involving two molecules of glutathione joined by a spermidine linker, which has been identified in pathogenic protists such as Trypanosomatida and Schizopyrenida. Furthermore, in contrast to plants, photosynthesis by Euglena is not susceptible to hydrogen peroxide because of resistance of the Calvin cycle enzymes fructose-1,6-bisphosphatse, NADP+-glyceraldehyde-3-phosphatase, sedoheptulose-1,7-bisphosphatase, and phosphoribulokinase to hydrogen peroxide. Consequently, these characteristics of Euglena appear to exemplify a strategy for survival and adaptation to various environmental conditions during the evolutionary process of euglenoids.
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Abbreviations
- AOX:
-
Alternative oxidase
- APX:
-
Ascorbate peroxidase
- AsA:
-
L-ascorbic acid
- DHA:
-
Dehydroascorbate
- DHAR:
-
Dehydroascorbate reductase
- FBPase:
-
Fructose-1,6-bisphosphatse
- FTR:
-
Ferredoxin-dependent Trx reductase
- GAPDH:
-
Glyceralgehyde-3-phosphate dehydrogenase
- GPX:
-
Glutathione peroxidase
- GR:
-
Glutathione reductase
- GSH:
-
Reduced glutathione
- GSH1:
-
γ-glutamylcysteine synthetase
- GSH2:
-
Glutathione synthetase
- GSP:
-
Glutathionylspermidine
- GSPS:
-
Glutathionylspermidine synthetase
- GSSG:
-
Oxidized glutathione
- MDA:
-
Monodehydroascorbate
- MDAR:
-
Monodehydroascorbate reductase
- NTR:
-
NADPH-dependent Trx reductase
- OvoA:
-
5-histidylcysteine sulfoxide synthase
- Prx:
-
Peroxiredoxin
- PSI:
-
Photosystem I
- PSII:
-
Photosystem II
- ROS:
-
Reactive oxygen species
- RuPK:
-
Ribulose-5-phosphate kinase
- SBPase:
-
Sedoheptulose-1,7-bisphosphatase
- SOD:
-
Super oxide dismutase
- Srx:
-
Sulfiredoxin
- T(SH)2 :
-
Trypanothione
- Trx:
-
Thioredoxin
- TRYR:
-
Trypanothione reductase
- γ-EC:
-
γ-Glu-Cys
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Ishikawa, T., Tamaki, S., Maruta, T., Shigeoka, S. (2017). Biochemistry and Physiology of Reactive Oxygen Species in Euglena . In: Schwartzbach, S., Shigeoka, S. (eds) Euglena: Biochemistry, Cell and Molecular Biology. Advances in Experimental Medicine and Biology, vol 979. Springer, Cham. https://doi.org/10.1007/978-3-319-54910-1_4
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