[Bend of the furanose ring of the double-helical DNA].

The interpretation of conformationally dependent double-helical DNA Raman bands, which stipulates their appearance with the furanose ring-puckering vibration is suggested. Quantum-mechanical calculations of the furanose ring-puckering vibration occurring by a pseudorotation pathway are carried out. Vibrational states eigen values and eigen functions are calculated for a double-well pseudorotation potential of the furanose. The obtained value of the pseudorotation barrier 4.2-3.6 kcal/mol proves to be in a good agreement with other theoretical and experimental estimates of the barrier.