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A model for the single stranded random coil form of polydeoxyadenylic acid from minimum energy conformations of the
Abstract:
The minimum energy conformations of dApdA have been examined for their suitability as buildings blocks of the single stranded coil form of polynucleotides. Calculations of the characteristic ratio C difference = less than ro greater than 2/n liter2 were made for a polymer generated from all the low energy conformers, as well as for selected combinations. A polymer composed of a conformer with omega', omega = t*,g+,(skewed) psi = t, C-(2)-endo type pucker, in combination with the 'B' form, has a C difference equal to that observed in coils of apurinic acid (6) when the fraction of 'B' form conformers is approximately 25% and approximately 91%. The t*,g+ conformer is the second lowest energy form in the C-(2)-endo puckering domain, following the 'B' form.