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Nucleic Acids Research, 1981, Vol. 9, No. 20 5443-5458
© 1981


CHEMISTRY

The high salt form of poly(dG-dC)·poly(dG-dC) is left-handed Z-DNA: Raman spectra of crystals and solutions

Thomas J. Thamann, Richard C. Lord, Andrew H.J. Wang and Alexander Rich

Spectroscopy Laboratory and Departments of Chemistry and Biology, Massachusetts Institute of Technology Cambridge, MA 02139, USA

Received July 22, 1981. The laser-Raman spectra of crystalline d(CpGpCpGpCpG) and of aqueous poly(dG-dC)·poly(dG-dC) in high salt (4M NaCl) and low salt (0.lM NaCl) solutions have been measured and compared. The spectra of the crystal and the high-salt solution show a striking congruence, which indicates clearly that the high-salt form of the aqueous polymer has the left-handed Z-DNA structure of the crystalline oligomer. These two spectra differ substantially from that of the low-salt form of the polymer, which has been found previously to have spectral characteristics of the B-form of DNA. The high salt spectrum shows a unique line due to guanine residues at 625 cm-1 which should be useful for qualitative and possibly quantitative assessment of the amount of Z-structure present in a sample of DNA.


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