Abstract
Replicating chromosomes, called intermediate DNA, have been extracted from the adenovirus replication complex. Compared to mature molecules, intermediate DNA had a greater buoyant density in CsCl gradients and ethidium bromide-cesium chloride gradients. Digestion of intermediate DNA with S1 endonuclease, but not with RNase, abolished the difference in densities. These properties suggest that replicating molecules contain extensive regions of parental single strands. Although intermediate DNA sedimented faster than marker viral DNA in neutral sucrose gradients, single strands longer than unit length could not be detected after alkaline denaturation. Integral size classes of nascent chains in intermediate DNA suggest a relationship between units of replication and the nucleoprotein structure of the virus chromosome. Adenovirus DNA was replicated at a rate of 0.7 x 10-6 daltons/min. Although newly synthesized molecules had the same sedimentation coefficient and buoyant density as mature chromosomes, they still contained single-strand interruptions. Complete joining of daughter strands required an additional 15 to 20 min.
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Selected References
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