Biopolym. Cell. 1989; 5(1):16-22.
Structure and Function of Biopolymers
Buckle of the A-T pair in the Bh-form of poly(dA):poly(dT)
1Lipanov A. A., 1Beglov D. B., 1Alexeev D. G., 1Skuratovsky I. Ya.
  1. Institute of Molecular Genetics, Academy of Sciences of the USSR
    Moscow, USSR

Abstract

The structures of calcium and sodium salts of poly(dA): poly(dT) have been refined on the basis of X-ray diffraction in fibres using two parameter flexible sugar, and allowing for the possible A-T buckle. The bases of one chain, probably thymines, are tilted in the Na-poly(dA):poly(dT) structure at an angle of about —13°, while the tilt of the other chain bases is negligible. A number of unique features warrant a special designation, Bh, to distinguish poly(dA) : poly(dT) structure from other B-type structures. The refined structural parameters may be significant for the interpretation of data on DNA bends containing sufficiently long dAn:dTn tracts.

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