Table 6. Relationships between helical parameters and ΔRDCs or internucleotide distances, from bivariate correlations based on X-ray structures.
| CC | SDres | P-value | |
|---|---|---|---|
| Roll = 1.0 ΔRDCC6/8-H6/8 + 1.7 | 0.70 | 6.1 | <2.2 10−16 |
| Roll = −0.7 ΔRDCC3′-H3′ + 2.9 | −0.54 | 7.2 | 2.12 10−9 |
| Roll = 0.9 ΔRDCC4′-H4′ + 2.2 | 0.76 | 5.6 | <2.2 10−16 |
| Twist = 8.5 Dinter(H6/8i-H6/8i+1) − 8.8 | 0.84 | 5.9 | <2.2 10−16 |
| Twist = 9.0 Dinter(H2′i-H6/8i+1) + 1.3 | 0.88 | 5.1 | <2.2 10−16 |
| Slide = 0.94 Dinter(H2″i-H6/8i+1) − 2.8 | 0.84 | 0.35 | <2.2 10−16 |
This table reports the equations expressing roll (°), twist (°) and slide (°) as function of ΔRDCs (Hz) or internucleotide distances (Dinter, Å). The equations were obtained from linear regressions involving either ΔRDC or Dinter versus a single helical parameter, slide, roll or twist (bivariate correlations) from high resolution X-ray structures (see Table 4 and Figure 5). They are characterized by the CC, the standard residual deviations on the helical parameters (SDres) and the P-values.