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. 1976 Nov;73(11):4125–4129. doi: 10.1073/pnas.73.11.4125

Superstructure of linear duplex DNA.

H J Vollenweider, T Koller, J Parello, J M Sogo
PMCID: PMC431353  PMID: 1069302

Abstract

The superstructure of a covalently closed circular DNA (of bacteriophage PM 2) was compared by electron microscopy with that of a linear duplex DNA (of bacteriophage T7) when ionic strength and benzyldimethylalkylammonium chloride concentration were varied. In parallel studies the sedimentation behavior of these DNAs was studied by analytical ultracentrifugation, but for technical reasons these had to be without benzyldimethylalkylammonium chloride. By combining the information from the two methods one has to conclude that with increasing ionic strength the linear duplex T7 DNA spontaneously forms a structure similar to that of the superhelical structure of closed circular PM 2 DNA. The superstructure is destroyed under premelting conditions and in the presence of an excess of ethidium bromide.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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