Fig. 3. 2D NOESY spectra show that the upper stem is more dynamic in the methylated than in the unmethylated M2577 hairpin.
(a) Superimposed imino regions of the 2D 1H NOESY NMR spectra of M2577-A (blue) and M2577-m6A (red) in 10% D2O. The spectra of 0.47 mM RNA were measured at 4 °C with a 100 ms mixing time. (b) Superimposed imino regions of the 2D 1H NOESY NMR spectra of M2577-A and M2577-m6A in 10% D2O. The spectra of 1.12 mM RNA were measured at 20 °C with a 100 ms mixing time. (c) Separate and superimposed amino–imino regions of the 2D 1H NOESY NMR spectra of M2577-A and M2577-m6A in 10% D2O at 20 °C. (d) Superimposed H6/H8–H1′ regions of the 2D 1H NOESY NMR spectra of M2577-A and M2577-m6A in 100% D2O. The spectra of 0.78 mM RNA were measured at 20 °C with a 100 ms mixing time.