Add time:09/29/2019 Source:sciencedirect.com
2–4 mM L-ETHIONINE (cas 13073-35-3) completely inhibits DNA synthesis in phytohaemagglutinin- or concanavalin A-stimulated lymphocytes even though it does not prevent the morphological changes characteristic of blast formation. Evidence is presented which indicates that complete commitment to DNA synthesis as well as a substantial increase in the rates of RNA and protein synthesis can occur in the presence of ethionine. Ethionine, however, does inhibit methylation of tRNA and prevents mitogen-induced increase in the activity of histone-modifying enzymes.All of these effects of exposure to ethionine are completely reversible. Removal of ethionine after 24 h or more of exposure results in a rapid, synchronous wave of DNA synthesis, an increase in the rate of methylation of RNA and an increase in activity of histone-modifying enzymes.
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