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Defluorination of methoxyflurane by a glutathione-dependent enzyme
Research Communications in Chemical Pathology and Pharmacology
|February 1, 1977
Summary
Researchers partially purified a rat liver enzyme that defluorinates methoxyflurane. This enzyme requires glutathione, suggesting it is a glutathione S-transferase, crucial for methoxyflurane metabolism.
Area of Science:
- Biochemistry
- Enzymology
- Toxicology
Background:
- Methoxyflurane is an anesthetic agent whose metabolism involves defluorination.
- Understanding the enzymes involved in methoxyflurane metabolism is important for assessing its toxicity.
- Rat liver is a common model system for studying drug metabolism.
Purpose of the Study:
- To partially purify and characterize the enzyme responsible for methoxyflurane defluorination from rat liver.
- To investigate the cofactor requirements for the enzyme's activity.
Main Methods:
- Fractionation of rat liver homogenates using protamine sulfate and ammonium sulfate precipitation.
- Chromatographic separation using Sephadex G-100.
- Assay of enzyme activity in the presence of various sulfhydryl compounds.
Main Results:
- A 10-fold purification of the defluorinating enzyme was achieved with 53% recovery.
- The enzyme's activity was dependent on the presence of glutathione.
- Other sulfhydryl compounds could not substitute for glutathione.
Conclusions:
- The purified enzyme is likely a glutathione S-transferase.
- This enzyme plays a role in the metabolic defluorination of methoxyflurane.
- Further characterization may reveal its specific role among known glutathione S-transferases.