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- W2077667025 abstract "Analysis by two-dimensional gel electrophoresis of topoisomers of plasmids containing d(pCpG)n . d(pCpG)n inserts, in which n ranges between 8 and 21, shows that the B-to-Z transition within the alternating C-G is readily induced by negative supercoiling and is highly cooperative. The free energy parameters for the transition in dilute aqueous buffers have been evaluated from a statistical mechanical analysis of the data, and these parameters allow prediction of the superhelicities of plasmids at which the transition occurs in alternating C-G inserts over a wide range of lengths. In agreement with the crystal structures, the helical handedness of the B structure in solution and that of the Z structure are shown to be opposite to each other. Furthermore, it is found that the B form of the alternating C-G sequence in solution has a helical periodicity of 10.5 +/- 0.1 base pairs per turn, and the Z form has a helical periodicity of 11.6 +/- 0.3 base pairs per turn. There also appears to be a significant unwinding of the right-handed DNA duplex at each of the B/Z junctions." @default.
- W2077667025 created "2016-06-24" @default.
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- W2077667025 date "1983-10-01" @default.
- W2077667025 modified "2023-10-15" @default.
- W2077667025 title "Energetics of B-to-Z transition in DNA." @default.
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- W2077667025 doi "https://doi.org/10.1073/pnas.80.20.6206" @default.
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