title: Yeast killer dsRNA plasmids are transcribed in vivo to produce full and partial-length plus-stranded RNAs.
abstract: In vivo transcripts of the L (4.5 kb) and M (1.9 kb) dsRNA plasmids were examined in type I killers of Saccharomyces cerevisiae. Transcripts for both plasmids include full-length (l,m) and partial-length (la,ma) single-stranded species. Both L-dsRNA transcripts (l,la) have in vitro mRNA activity for L-P1, previously shown to be identical to ScV-P1, the 88,000 dalton major capsid protein of the virus-like particles containing L- and M1-dsRNAs. 1, but not 1a, is bound to poly(U)-sepharose and may be polyadenylated. Other L-dsRNA gene products and their transcripts may exist. For M1-dsRNA, both species (m, ma) have in vitro mRNA activity for M1-P1, the 32,000 dalton pre-protoxin encoded by M1-dsRNA. Both m and ma are bound to poly(U)-Sepharose and ma is probably a 5' terminal fragment of m. A functional model for M1-dsRNA killer plasmid structure is presented.
mesh_terms: D000818:Animals; D002213:Capsid / Q000235:genetics; D008970:Molecular Weight; D009154:Mutation; D010944:Plants / Q000378:metabolism; D010957:Plasmids; D014176:Protein Biosynthesis; D012330:RNA, Double-Stranded / Q000235:genetics*; D012333:RNA, Messenger / Q000235:genetics; D012156:Reticulocytes / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000235:genetics*; D014158:Transcription, Genetic; D014908:Triticum / Q000378:metabolism
chemical_list: D012330:RNA, Double-Stranded; D012333:RNA, Messenger