Characterization of chloroplastic thioredoxin dependent glutathione peroxidase like protein in Euglena gracilis: biochemical and functional perspectives.
Biosci Biotechnol Biochem
; 88(9): 1034-1046, 2024 Aug 26.
Article
em En
| MEDLINE
| ID: mdl-38925644
ABSTRACT
Euglena gracilis, a fascinating organism in the scientific realm, exhibits characteristics of both animals and plants. It maintains redox homeostasis through a variety of enzymatic and non-enzymatic antioxidant molecules. In contrast to mammals, Euglena possesses nonselenocysteine glutathione peroxidase homologues that regulate its intracellular pools of reactive oxygen species. In the present study, a full-length cDNA of chloroplastic EgGPXL-1 was isolated and subjected to biochemical and functional characterization. Recombinant EgGPXL-1 scavenged H2O2 and t-BOOH, utilizing thioredoxin as an electron donor rather than glutathione. Despite its monomeric nature, EgGPXL-1 exhibits allosteric behavior with H2O2 as the electron acceptor and follows typical Michaelis-Menten kinetics with t-BOOH. Suppression of EgGPXL-1 gene expression under normal and high-light conditions did not induce critical situations in E. gracilis, suggesting the involvement of compensatory mechanisms in restoring normal conditions.
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Base de dados:
MEDLINE
Assunto principal:
Tiorredoxinas
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Euglena gracilis
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Glutationa Peroxidase
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article