Abstract
Summary 1 mM 5′-deoxy-5′-S-isobutyl-adenosine (SIBA) (I), a structural analogue of S-adenosyl-homocysteine (SAH), inhibits the oncogenic transformation of chick embryo fibroblasts (CEF) infected with Rous sarcoma virus (RSV). When SIBA remains in contact with infected cells for 48 hours the inhibition of focus formation is irreversible, at least for 8 days. Virus replication is also strongly inhibited by SIBA. Normal CEF are only reversibly inhibited by this compound. SAH, the natural inhibitor of SAM dependent transmethylases has no effect on cell transformation.
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