title: Inhibition of oncornavirus functions by poly (2-methylthioinosinic acid).
abstract: Poly (2-methylthioinosinic acid) [poly(ms2I)] was found to markedly inhibit the RNA directed DNA polymerase (reverse transcriptase) activity of murine (Moloney, Rauscher) leukemia virus and murine (Moloney) sarcoma virus, while under the same conditions the unsubstituted parent compound poly(I) showed little, if any, inhibitory effect. Copolymers of inosinic acid (I) and 2-methylthioinosinic acid2(ms2I) showed an intermediary effect, depending on the I:ms2I ratio. Poly(ms2I) also inhibited the transformation of normal cells by murine (Moloney) sarcoma virus, as assessed by an infectious center assay.
mesh_terms: D002471:Cell Transformation, Neoplastic / Q000187:drug effects; D002472:Cell Transformation, Viral / Q000187:drug effects; D017988:Gammaretrovirus / Q000187:drug effects*; D007288:Inosine / Q000031:analogs & derivatives*; D008778:Methylthioinosine / Q000494:pharmacology*; D008979:Moloney murine leukemia virus / Q000187:drug effects / Q000378:metabolism; D011069:Poly I / Q000031:analogs & derivatives / Q000494:pharmacology*; D011131:Polyribonucleotides / Q000494:pharmacology*; D011925:Rauscher Virus / Q000187:drug effects / Q000378:metabolism; D018894:Reverse Transcriptase Inhibitors; D009053:Sarcoma Viruses, Murine / Q000187:drug effects / Q000378:metabolism
chemical_list: D011131:Polyribonucleotides; D018894:Reverse Transcriptase Inhibitors; D011069:Poly I; D008778:Methylthioinosine; D007288:Inosine