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. 1981 Jun;38(3):826–832. doi: 10.1128/jvi.38.3.826-832.1981

Polyoma virus minichromosomes: associated enzyme activities.

B B Gourlie, V Pigiet, C B Breaux, M R Krauss, C R King, R M Benbow
PMCID: PMC171219  PMID: 6264157

Abstract

Polyoma minichromosomes were isolated and fractionated on glycerol gradients as described by Gourlie et al. (J. Virol. 38:805-814, 1981). Specific assays for DNa polymerases alpha, beta, and gamma, DNA topoisomerase I, and RNase H were carried out on each fraction. The number of units of activity in each fraction was compared with the number of total polyoma and replicative intermediate DNA molecules in each fraction determined by quantitative electron microscopy (M. R. Krauss and R. M. Benbow, J. Virol. 38:815-825, 1981). DNA polymerase alpha cosedimented with polyoma replicative intermediate DNA molecules. DNA polymerase beta and DNA topoisomerase I activities sedimented with mature polyoma minichromosomes. Although the bulk of RNase H activity sedimented in the minichromosome region, the peak of activity was found one fraction behind the peak of mature minichromosomes. Virtually no DNA polymerase gamma activity cosedimented with polyoma minichromosomes.

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Selected References

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