The effect of ethanol and its metabolites upon methionine synthase activity in vitro
| Autor: | William A. Gibbons, Susan H. Kenyon, Anna Nicolaou |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Health (social science)
Time Factors Homocysteine Acetaldehyde Acetates Toxicology Biochemistry 5-Methyltetrahydrofolate-Homocysteine S-Methyltransferase Behavioral Neuroscience chemistry.chemical_compound Animals Methionine synthase Methionine synthase activity chemistry.chemical_classification Ethanol Methionine biology Chemistry Osmolar Concentration General Medicine Enzyme assay Rats Enzyme Neurology biology.protein |
| Zdroj: | Alcohol (Fayetteville, N.Y.). 15(4) |
| ISSN: | 0741-8329 |
| Popis: | The association of alcoholism with macrocytic anaemia has lead to investigation of the role of cobalamin-dependent methionine synthase in mediating alcohol toxicity. Several studies have found that long-term ingestion of large quantities of ethanol causes inhibition of liver methionine synthase activity in vivo: however, ethanol has not been found to inhibit the enzyme directly. The effect of ethanol and its breakdown products, acetate and acetaldehyde, on highly purified rat liver methionine synthase was tested in vitro. Enzyme activity was not inhibited by ethanol or acetate. Acetaldehyde was found to inhibit methionine synthase activity, with an apparent IC50 of 2 mM. The reported inhibition by acetaldehyde was found to become irreversible over time. Acetaldehyde-induced inhibition of liver methionine synthase activity is thus proposed as the most likely explanation of the reported in vivo effect of ethanol upon methionine synthase. |
| Databáze: | OpenAIRE |
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