Fig. 4
From: Dipolar couplings in solid polypeptides probed by 14N NMR spectroscopy
Long-range correlation 1H-14N 2D NMR spectrum. Two-dimensional 1H → 14N → 1H DCP spectrum analogous to that of Fig. 2(b) but acquired with longer contact pulses of length τCP = 60τR = 600 μs. One-bond distance correlations for the four NH sites are assigned according to the DFT calculations and highlighted in red. Long-range correlations between 14N and nearby intra- and inter-residue protons are highlighted in magenta. These were assigned according to the dipolar contacts in Table 1. In all, 420 transients were averaged for each of the 64 rotor-synchronized t1 increments with a recovery delay of 0.2 s, resulting in a total experimental time of ca. 9 h
