Abstract
Atomic coordinates and other stereochemical parameters are presented for the A and B conformations of DNA. The molecular structures presented have the most probable values of bond-lengths, bond-angles and furanose ring conformations as defined by accurate X-ray crystallographic analyses of relevant monomers. Conformation-angles have values that provide the best (least-squares) fit with the X-ray diffraction data observed from the polymers themselves. The major difference between A- and B-DNA is in the conformation of the furanose ring that is (C3- endo ) for A and (C3- exo ) for B.
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