glutathione peroxidase
Definition
Noun: An enzyme that catalyzes the reduction of hydrogen peroxide and organic hydroperoxides to water and alcohols, respectively, using glutathione as a reducing agent. It is a crucial component of the body's antioxidant defense system, protecting cells from oxidative damage caused by free radicals and reactive oxygen species.
Usage
This term is used primarily in scientific, medical, and biochemical contexts to describe a specific antioxidant enzyme. * The research focused on the role of glutathione peroxidase in reducing oxidative stress. * Selenium is an essential trace element because it is a cofactor for glutathione peroxidase.
Advanced Usage
- Isoforms: The term often refers to a family of enzymes. Specific isoforms are denoted with numbers (e.g., glutathione peroxidase 1, GPx1).
- Glutathione peroxidase 4 (GPx4) has a unique function in protecting membranes from lipid peroxidation.
- Activity Measurement: The phrase "glutathione peroxidase activity" is common in laboratory studies assessing antioxidant capacity.
- The study measured glutathione peroxidase activity in the blood samples.
Variants and Related Words
- GPx: A standard abbreviation for glutathione peroxidase.
- Glutathione: The tripeptide (γ-glutamyl-cysteinyl-glycine) that serves as the reducing substrate for this enzyme.
- Antioxidant Enzyme: A broader category to which glutathione peroxidase belongs.
Synonyms
- Antioxidant enzyme (this is a functional synonym within a broader category, but not a direct synonym for the specific protein).
Related Phrases
- Selenium-dependent glutathione peroxidase: A phrase specifying the most common form of the enzyme that requires selenium at its active site.
- The deficiency affects selenium-dependent glutathione peroxidase function.
Noun
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an enzyme in the body that is a powerful scavenger of free radicals
