Table 2. Target values for simple base-pair conformation parameters.
SD, standard deviation.
| Base-pair type | Base pair | Count | Stretch (SD)† (Å) | Shear (SD)† (Å) | Propeller (SD)† (°) | Buckle (SD)† (°) |
|---|---|---|---|---|---|---|
| DNA–DNA | A–T | 899 | −0.111 (0.048) | 0.042 (0.095) | −10.495 (6.315) | 1.325 (7.327) |
| G–C | 1544 | −0.130 (0.063) | −0.215 (0.101) | −6.432 (7.498) | −0.385 (8.453) | |
| RNA–RNA | A–U | 602 | −0.103 (0.041) | 0.042 (0.107) | −11.560 (4.560) | −0.720 (5.951) |
| G–C | 675 | −0.131 (0.056) | −0.209 (0.115) | −10.979 (5.268) | −3.403 (5.437) | |
| DNA–RNA | A–T | 92 | −0.135 (0.027) | 0.103 (0.060) | −9.742 (3.033) | −5.269 (2.679) |
| G–C | 131 | −0.150 (0.037) | −0.175 (0.078) | −7.512 (4.648) | 0.838 (7.368) | |
| A–U | 43 | −0.133 (0.020) | 0.007 (0.050) | −9.781 (2.039) | 2.380 (2.356) |
†
The precision used is for consistency with the typical precision used in the CCP4 Monomer Library.