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• W1990599103 abstract "The interaction of HCl with calf thymus DNA was investigated in aqueous solution at pH 7-2 with H+/DNA(P)(P:phosphate) molar ratios (r) of 1/80, 1/40, 1/20, 1/10, 1/4, 1/2, and 1, using Fourier Transform (FTIR) difference spectroscopy. Correlations between spectral changes, proton binding mode, DNA denaturation, and conformational variations are established. A comparison was also made between their spectra of denaturated DNA, in the presence of proton and Cu ions with similar cation concentrations. The FTIR difference spectroscopic results have shown that at low proton concentrations of r = 1/80 and 1/40 (pH 7–5), no major spectral changes occur for DNA, and the presence of H+ results in an increased base-stacking interaction and helical stability. At higher proton concentrations of r > 1/40, the proton binding to the cytosine and adenine bases begins with major destabilization of the helical duplex. As base protonation progresses, a B to C conformational conversion occurs with major DNA spectral changes. Protonation of guanine bases occurs at a high cation concentration r > 1/2 (pH < 3) with a major increase in the intensity of several DNA in-plane vibrations. Copper ion complexation with DNA exhibits marked similarities with proton at high cation concentrations (r > 1/10), whereas at low metal ion concentrations, copper–PO2 and copper–guanine N-7 bindings are predominant. No major DNA conformational transition was observed on copper ion complexation. © 1995 John Wiley & Sons, Inc." @default.
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• W1990599103 date "1995-05-01" @default.
• W1990599103 modified "2023-10-10" @default.
• W1990599103 title "The effect of HCl on the solution structure of calf thymus DNA: A comparative study of DNA denaturation by proton and metal cations using fourier transform IR difference spectroscopy" @default.
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• W1990599103 doi "https://doi.org/10.1002/bip.360350508" @default.
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