Forms of deoxyribonucleic acid produced by virions of the ribonucleic acid tumor viruses - PubMed (original) (raw)
Forms of deoxyribonucleic acid produced by virions of the ribonucleic acid tumor viruses
K F Manly et al. J Virol. 1971 Jan.
Abstract
The in vitro product of mouse leukemia virus deoxyribonucleic acid (DNA) polymerase can be separated into two fractions by sedimentation in sucrose gradients. These two fractions were analyzed for their content of single-stranded DNA, double-stranded DNA, and DNA-ribonucleic acid (RNA) hybrid by (i) digestion with enzymes of known specificity and (ii) equilibrium centrifugation in Cs(2)SO(4) gradients. The major fraction early in the reaction contained equal amounts of single-stranded DNA and DNA-RNA hybrid and little double-stranded DNA. The major fraction after extensive synthesis contained equal amounts of single-and double-stranded DNA and little hybrid. In the presence of actinomycin D, the predominant product was single-stranded DNA. To account for these various forms of DNA, we postulate the following model: the first DNA synthesis occurs in a replicative complex containing growing DNA molecules attached to an RNA molecule. Each DNA molecule is displaced as single-stranded DNA by the synthesis of the following DNA strand, and the single-stranded DNA is copied to form double-stranded DNA either before or after release of the single strand from the RNA. Actinomycin blocks this conversion of single-to double-stranded DNA.
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