Abstract
We first show that under topological constraints segments of natural DNA containing (A.T) and (G.C) base pairs can adopt the Z conformation. This is deduced from the titration of form V DNA by the antibodies to Z-DNA. We then report some results on exchange kinetics of the protons involved in hydrogen bonds between base pairs of poly(dG-m5dC).poly(dG-m5dC), in Z conformation. There are two classes of protons, a fast one the exchange half-time of which is 40 mn and a slow one the exchange half-time of which is 960 mn. These values are deduced from infrared absorption measurements in 2H2O and H2O. These half-times are in good agreement with those determined for several alternating polynucleotides in Z-form and confirm the difference between the dynamic structure of B and Z-forms. Finally, we have studied the thermal stability of (m5dC-dG)3 by 31P nuclear magnetic resonance, circular dichroism and ultra-violet absorption. In 3 M NaC1O4, (m5dC-dG)3 has the Z conformation. The melting curve of the hexanucleotide is biphasic. The first transition occurs over a large range of temperature. It corresponds to a conformational change due to an intramolecular non-cooperative process. This new conformation is not the B-form. The second transition is cooperative and corresponds to the melting of a double helix into single strands.
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Leng, M., Hartmann, B., Malfoy, B., Pilet, J., Ptak, M. (1983). Dynamic Structure of Z-DNA. In: Pullman, B., Jortner, J. (eds) Nucleic Acids: The Vectors of Life. The Jerusalem Symposia on Quantum Chemistry and Biochemistry, vol 16. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7225-4_4
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DOI: https://doi.org/10.1007/978-94-009-7225-4_4
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