title: A small DNA molecule containing covalently-linked ribonucleotides originates from the large intergenic region of the cauliflower mosaic virus genome.
abstract: We have detected a small DNA molecule (sa-DNA), 725 nucleotides long, in cauliflower mosaic virus (CaMV)-infected, but not non-infected, turnip leaves. Alkali and RNase A treatments shortened sa-DNA by 100 nucleotides and we conclude that it contains covalently-linked ribonucleotides. This DNA co-purified with cellular polyadenylated RNA. It is complementary to the beta-strand of CaMV DNA and of opposite polarity to RNAs transcribed from the alpha-strand. Hybridisation studies suggest that sa-DNA originates from the large intergenic region (IR1) of the CaMV genome. A small double-stranded DNA with three single-stranded components, which co-purifies with cellular DNA, appears to be related to sa-DNA but lacks detectable ribonucleotides.
mesh_terms: D003001:Cloning, Molecular; D004262:DNA Restriction Enzymes; D004274:DNA, Recombinant / Q000378:metabolism; D004279:DNA, Viral / Q000235:genetics* / Q000302:isolation & purification; D005814:Genes, Viral; D008970:Molecular Weight; D009029:Mosaic Viruses / Q000235:genetics*; D009693:Nucleic Acid Hybridization; D012265:Ribonucleotides / Q000032:analysis*; D014158:Transcription, Genetic
chemical_list: D004274:DNA, Recombinant; D004279:DNA, Viral; D012265:Ribonucleotides; D004262:DNA Restriction Enzymes