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. 1986 Mar 11;14(5):2045–2058. doi: 10.1093/nar/14.5.2045

Transcriptionally active SV40 minichromosomes are restriction enzyme sensitive and contain a nucleosome-free origin region.

E Weiss, C Ruhlmann, P Oudet
PMCID: PMC339642  PMID: 3008084

Abstract

A nucleosome-free region or gap containing the origin of replication and the transcriptional promoter elements is observed on 20 to 25% of the SV40 minichromosomes isolated at physiological ionic strength late in infection. We used the preferential sensitivity of the gapped minichromosomes to restriction enzymes to obtain sucrose gradient fractions containing 50 to 80% of gapped molecules. The same fractions are also enriched in RNA polymerase B (II) molecules engaged in transcription. Using electron microscopy, we demonstrate here that the transcriptional complexes are preferentially sensitive to restriction enzyme digestion, which indicate that they represent a subpopulation of the gapped minichromosomes.

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Selected References

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