Stereochemical parameters
The table below lists some the stereochemical parameters of Morris et al. (1992), derived
from high-resolution protein structures.
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Stereochemical parameter | Mean value | St. dev.
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| |
Phi-psi in most favoured | |
regions of Ramachandran plot | >90% |
| |
Chi1 dihedral angle: | |
gauche minus | 64.1 degrees | 15.7 degrees
trans | 183.6 degrees | 16.8 degrees
gauce plus | -66.7 degrees | 15.0 degrees
| |
Chi2 dihedral angle | 177.4 degrees | 18.5 degrees
| |
Proline phi torsion angle | -65.4 degrees | 11.2 degrees
| |
Helix phi torsion angle | -65.3 degrees | 11.9 degrees
Helix psi torsion angle | -39.4 degrees | 11.3 degrees
| |
Chi3 (S-S bridge): | |
right-handed | 96.8 degrees | 14.8 degrees
left-handed | -85.8 degrees | 10.7 degrees
| |
Disulphide bond separation | 2.0A | 0.1A
| |
Omega dihedral angle | 180.0 degrees | 5.8 degrees
| |
Main-chain hydrogen | |
bond energy (kcal/mol)* | -2.03 | 0.75
| |
C-alpha chirality: zeta | |
`virtual' torsion angle | 33.9 degrees | 3.5 degrees
(Calpha-N-C-Cbeta | |
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* Evaluated using the Kabsch & Sander (1983) method.