Abstract
Left-handed helical conformations can be adopted by the poly[d(A-C)•d(G-U)] family of DNAs bearing at least one methyl or halogen (bromine, iodine) substitution at the pyrimidine C5 heterocyclic position. A representative polynucleotide is poly[d(A-br5C)•d(G-T)]. Elevation of salt concentration and temperature shifts the equilibrium in favor of the left-handed state. The spectral changes (u.v. absorption, c.d., NMR, Raman) accompanying the highly co-operative and reversible R(right)-L(left) transitions are similar to those observed with poly[d(G-C)]. Some, but not all, antibodies raised against the left-handed members of the poly[d(G-C)] family also recognize the new class of polymers, thus establishing the existence of sequence-specific determinants in the binding of certain anti-Z DNA immunoglobulins. The latter have been used to establish the presence of left-handed regions in natural plasmid and viral DNAs and in the giant salivary gland polytene chromosomes of Chironomus thummi thummi. The Z-DNA specific immunofluorescence in fixed polytene chromosomes has been quantitated by laser scanning and photon counting and is particularly intense in certain regions, such as the telomeres.
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Jovin, T.M., McIntosh, L.P., Zarling, D.A., Arndt-Jovin, D.J., Robert-Nicoud, M., van de Sande, J.H. (1983). Probing for and with Left-Handed DNA: Poly[d(A-br5c)•d(G-T)], a Member of a New Family of Z-Forming DNAs. 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_7
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DOI: https://doi.org/10.1007/978-94-009-7225-4_7
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