Table 3.
Helical parameters for the modified heptamer sequence d(GCG(xT)GCG)/d(CGCACGC) with (xT) a cyclohexene residue and comparison with classical B-type DNA
| Heptamer sequence | ||||
| A-DNAa | B-DNAa | Duplex 1 | Duplex 2 | |
| x-displacement (Å) | −4.17 | 0.05 | 0.08 (0.88) | −0.54 (2.40) |
| Inclination (°) | 14.7 | 2.1 | 3.8 (9.5) | 4.6 (18.2) |
| Rise (Å) | 3.32 | 3.32 | 3.23 (0.13) | 3.32 (0.40) |
| Twist (°) | 31.1 | 36.0 | 33.3 (6.0) | 31.5 (8.9) |
| Slide (Å) | −1.53 | 0.23 | 0.28 (0.47) | 0.08 (0.72) |
| Roll (°) | 8.0 | 0.6 | 2.0 (5.0) | 0.5 (8.7) |
| Propeller twist (°) | −11.8 | −11.4 | −5.2 (5.4) | −3.6 (12.4) |
| Buckle (°) | −0.1 | 0.5 | −4.9 (11.2) | −5.9 (12.4) |
a
Helical parameters for A- and B-type DNA are taken form (Olson et al. 2001). Values in parentheses represent the s.d.