Structure and properties of poly(dA) ·poIy(dT) and A : T sites in DNA. Calculations of the energy of nonvalent interactions in the system consisting of a regular polynucleotide and two hydration shells in its minor groove
DOI:
https://doi.org/10.7124/bc.000227Abstract
Interaction of poly(dA)·poly(dT) with two hydration shells forming a hydration spine similar to that found in the central part of the double-helical fragment d(CGCGAATTCGCG) in crystal to a considerable extent determines the existence of a specific polynucleotide conformation in fibers and in solutions. Atom-molecular models of these conformations with a narrow minor groove, a negative tilt and a positive propeller of the bases have been proposed. They explain a number of experimental facts concerning biologically important structural properties of DNA.References
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