title: Effect of interferon on integrity of vaccinia virus and ribosomal RNA in infected cells.
abstract: The state of vaccinia and ribosomal RNAs in IFN-treated, vaccinia virus-infected mouse L cells grown in suspension is examined. In these cells a drastic inhibition (approximately 90%) of both viral and cellular protein synthesis occurs after virus infection of IFN-treated cells. The findings show that (1) primary transcription of vaccinia virus is not impaired by IFN, but is rather enhanced; (2) viral RNAs produced in IFN-treated, infected cells are predominantly of the early class; (3) these viral RNAs can be translated in a cell-free protein-synthesizing system; (4) in IFN-treated, infected cells there is extensive cleavage of 28 and 18 S rRNA at early times post infection, resulting in a characteristic cleavage pattern; (5) cleavage of rRNA is viral RNA dependent. The results indicate that in this virus-cell system the IFN-mediated inhibition of vaccinia and cellular protein synthesis is correlated with an alteration in ribosomal integrity.
mesh_terms: D000818:Animals; D001483:Base Sequence; D003513:Cycloheximide / Q000494:pharmacology; D006367:HeLa Cells; D006801:Humans; D007372:Interferons / Q000494:pharmacology*; D007739:L Cells; D051379:Mice; D009693:Nucleic Acid Hybridization; D014176:Protein Biosynthesis; D012333:RNA, Messenger / Q000235:genetics; D012335:RNA, Ribosomal / Q000378:metabolism*; D012367:RNA, Viral / Q000096:biosynthesis / Q000235:genetics*; D014158:Transcription, Genetic; D014616:Vaccinia virus / Q000235:genetics / Q000378:metabolism*; D014764:Viral Proteins / Q000096:biosynthesis*
chemical_list: D012333:RNA, Messenger; D012335:RNA, Ribosomal; D012367:RNA, Viral; D014764:Viral Proteins; D007372:Interferons; D003513:Cycloheximide