Steric Parameters depending on Residual Nucleotides

Defining DNA types implies, among other, the knowledge of the conformational differences given by the torsion angles of the residual deoxyribonucleotide from DNA (Amott 1978, Jack 1979). The description 

The figure shows only the bindings with the nucleobase and the phosphodiester groups. Currently, there are described 

The internal torsion angles, which are characteristic for the furanose ring of deoxyribose (noted by T0-T4) determine the appearance of endo- and exo-conformations of deoxyribose. The Watson-Crick model corresponds to B-DNA type, having the deoxyribose in the C-2 -endo conformational form. The secondary structure of B-DNA 

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