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[Structure of the hydration envelope of the B-form of polydeoxyribonucleotides poly(dA-dC).poly(dG-dT) and poly(dA-dG).poly(dTs-dT) from the data of Monte-Carlo simulation].

The results of a Monte Carlo simulation of the hydration shell of two polynucleotides poly (dA-dC).poly(dG-dT) and poly(dA-dG).poly(dC-dT) are reported. This study is a part of a series of Monte Carlo computations of the hydration of regular polydeoxyribonucleotides with dinucleotide repeat aimed at looking for dependences of hydration shell structure on base sequence. The coordinates of the main local maximal of water density near the polymers and the topology of the most probable one- and two-membered water bridges are published. For most of the sequences a common primary hydration of base edges of successive base pairs is characteristic. The AT-homopolymeric sequence represents an exception with autonomous primary hydration of a base pair in both grooves, which correlates with the sequence-dependent flexibility and the occurrence of bends of DNA.