Abstract
A two-dimensional (neutral-alkali) agarose gel electrophoretic system was used to separate three families of replicative intermediate (RI) polyoma virus DNA molecules (form I, form II, and form III RIs). Two of these families, form II and III RIs, are the result of artifactual nicking of one of the parental strands of supercoiled RIs (form I RIs) during in vitro replication of soluble minichromosomes. Kinetic studies in vitro showed that the nicked RIs serve as templates for limited DNA synthesis. The nicked species are not converted into normal products, however. The nicking reaction, which appears to be specific for the parental strands, is dependent on magnesium ions and occurs concurrently with the in vitro synthesis of DNA.
MeSH Terms
DNA, Circular/isolation & purification
DNA, Superhelical/isolation & purification
DNA, Viral/biosynthesis,isolation & purification
Electrophoresis, Agar Gel
Kinetics
Magnesium/pharmacology
Models, Genetic
Polyomavirus/genetics
Virus Replication/drug effects
Chemicals
DNA, Circular
DNA, Superhelical
DNA, Viral
Magnesium
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Gourlie B B
Pigiet V P
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