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• W1965638003 endingPage "1203" @default.
• W1965638003 startingPage "1185" @default.
• W1965638003 abstract "Abstract The conformation of díC-Bi8G-C-G-C-Br8G) in aqueous solution was studied by CD and 1H-NMR spectroscopy and in condensed phase by IR spectroscopy. Whether in 0.1 M or 3 M NaCl solution or in film the only double helical structure adopted by brominated d(C-G)3 oligomer is the Z form. The IR spectrum of the film presents all the characteristic absorptions of the Z conformation and in particular is indicative of a syn conformation for the central guanosine as well as for the brominated one. Imino proton resonances of diC-Bi8G-C- G-C-Br8G) demonstrating the duplex formation were observed up to 60°C. It is interesting to note that the significant highfield shifts of the dC H5″ exocyclic sugar protons characteristic of the non exchangeable proton spectra of d(C-G)3 containing 5-methyl dC residues in the Z form were also detected in the proton spectrum of brominated oligomer. Whereas formation of the Z helix of methylated d(C-G)3 oligomers dependent on the salt concentration was found to occur via the preliminary formation of a B helix even in 4 M NaCl solution, the Z helix of d(C-Br8G-C-G-C-Br8G) is obtained directly from the coil form. However, IR data suggest that in the Z form of dlC-Bi8G-C-G-C-Bi8G), the overlapping of the base planes should be slightly different in comparison with the stacking observed in d(C-G)3 crystals. The kinetic data (activation energy and lifetime) of the Z helix-coil transition of brominated d(C-G)3 are compared to those of the B helix-coil transition observed for methylated d(C-G)3 in 0.1 M NaCl solution while the thermodynamic data of these two reactions (enthalpy and midpoint temperature) are slightly different." @default.
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• W1965638003 date "1985-06-01" @default.
• W1965638003 modified "2023-09-26" @default.
• W1965638003 title "Z Helix-coil Transition of d(C-Br⁸G-C-G-C-Br⁸G) Studied by CD,¹H-NMR and IR Spectroscopies" @default.
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• W1965638003 doi "https://doi.org/10.1080/07391102.1985.10507632" @default.
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• W1965638003 hasPublicationYear "1985" @default.
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