Summary
DL-ethionine increases the activity of liver biotinidase, an enzyme which hydrolyzes biotinylesters and biotinylpeptides. Chronic DL-ethionine feeding increases transiently the activity of biotinidase in mouse and rat liver, after which it remains elevated in the serum. In the present work we show that both isomers of DL-ethionine are equally good enhancers of the liver biotinidase, while, 3-ethylthiopropionate, the toxic metabolite of DL-ethionine, has no effect on the biotinidase activity of either liver or serum. We have also employed two different combinations of inhibitors of the hydrolytic pathway of SAH, a transmethylation product and potent inhibitor of methylation. It was found that these inhibitors (EHNA and Ara-A, 2-deoxycoformycin and adenosine) increase the activity of serum biotinidase as was the case with ethionine. Because SAH does not ethylate biomolecules, these changes in biotinidase activity, which can not be preveneted by adenine, biotin or lecithin are most probably related to the inhibition of methylation.
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Abbreviations
- Ara-A:
-
9-β-D-arabinofuranosyladenine
- EHNA:
-
erythro-9-(2-hydroxy-3-nonyl)adenine
- SAE:
-
S-adenosylethionine
- SAH:
-
S-adenosylhomocysteine
- SAM:
-
S-adenosylmethionine
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Kontinen, V.P., Pispa, J.P. Enhancement of biotinidase activity in mouse serum by inhibitors of methylation. Mol Cell Biochem 76, 85–91 (1987). https://doi.org/10.1007/BF00219401
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DOI: https://doi.org/10.1007/BF00219401