On the Helical Structure of Guanosine 5′-Monophosphate Formed at pH 5: Is It Left- or Right-Handed?

Figure 5

²³Na REDOR results obtained for (□) 5′-GMP (pH 5), (●) 5′-GMP (pH 8), and (∆) double-stranded calf thymus DNA (A-form). The dash lines are calculated using = , where is the dephasing time and is the second moment of the ²³Na-³¹P dipolar interactions [6]. The three values used in the calculations are 1.80, 0.90, and 0.45 × 10⁶ s^–2, corresponding to a Na-P distance between 3.1, 3.4, and 3.7 Å, respectively.