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• W2001027714 abstract "Complementary circular single strands of plasmid PβG or bacteriophage PM2 DNA but not of single-stranded φX174 DNA associate under hybridisation conditions, giving rise to a two-stranded complex. This DNA, which we call form V, has well-defined physico-chemical properties. It sediments as a sharp peak in neutral sucrose gradients; its electrophoretic mobility in agarose gels is between that of covalently closed (form I) and denatured DNA. In the electron microscope form V appears as highly folded duplex molecules indistinguishable from form I. However, increasing concentrations of ethidium bromide which lead to relaxation and recoiling of form I DNA have no comparable effect upon form V. At 260 nm form V PβG DNA has a hypochromicity of 18.6%, as compared to 23.4% in the case of PβG form II DNA and 10.5% in the case of single-stranded φX174 DNA. The thermal melting of form V is non-cooperative with gradual increase in absorbance similar to that of single-stranded DNA. The circular dichroism spectrum of form V DNA differs from that of form I, circular nicked (form II) and single-stranded φX174 DNA in that it shows a negative band at 295 nm and a shift for the main positive band from 273 to 266 nm. We propose that form V consists of right-handed Watson-Crick type double-helices which are compensated by an equal number of left-handed duplex turns and negative supercoils. Wo cannot decide whether left-handed duplex turns are stabilised by base-stacking and hydrogen bonding, as for example in the models described by Rodley et al. (1976) or Sasisekharan & Pattabiraman (1976), or whether they are merely compensatory turns without inherent stability." @default.
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• W2001027714 date "1979-06-01" @default.
• W2001027714 modified "2023-09-23" @default.
• W2001027714 title "Preparation and characterization of form V DNA, the duplex DNA resulting from association of complementary, circular single-stranded DNA" @default.
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• W2001027714 doi "https://doi.org/10.1016/0022-2836(79)90299-7" @default.
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