title: Synthesis of a 600-nucleotide-long plus-strand DNA by virions of Moloney murine leukemia virus.
abstract: A discrete, 600-nucleotide-long plus-strand DNA has been identified among the products of reverse transcription by virions of Moloney murine leukemia virus. Its polarity was shown by hybridization to minus-strand DNA. It appears to be copied from the right end of minus-strand DNA because (i) its restriction endonuclease cleavage pattern corresponds to the redundant 600-base segment found at either end of the ultimate double-stranded reverse transcription products, (ii) its synthesis is actinomycin D sensitive, and (iii) its synthesis begins during the first hour of a reverse transcription reaction when only the right-hand end of minus-strand DNA is available as template. We therefore call this DNA plus-strong-stop DNA by analogy with the minus-strong-stop DNA copied from the left end of the viral RNA. Both strong-stop DNAs are made early during in vitro reactions and decline in concentration later, consistent with postulated roles as initiators of long minus- and plus-strand DNA. Unlike minus-strong-stop DNA, plus-strong-stop DNA remains as a double-stranded nucleic acid after its synthesis, as shown by S1 nuclease resistance. A primer to initiate plus-strong-stop DNA synthesis has not been identified; the product found thus far has no detectable RNA attached to it.
mesh_terms: D002874:Chromosome Mapping; D004279:DNA, Viral / Q000096:biosynthesis*; D005814:Genes, Viral; D008970:Molecular Weight; D008979:Moloney murine leukemia virus / Q000235:genetics / Q000378:metabolism*; D009693:Nucleic Acid Hybridization; D012367:RNA, Viral / Q000378:metabolism; D012194:RNA-Directed DNA Polymerase / Q000378:metabolism*; D014779:Virus Replication
chemical_list: D004279:DNA, Viral; D012367:RNA, Viral; D012194:RNA-Directed DNA Polymerase