PROCHECK-NMR - Sample plots
11. Equivalent resolution
Description
The Equivalent resolution plots are intended as a very approximate
guide to how the geometry of the models in the NMR ensemble compare
with that of X-ray crystal structures solved at different
resolutions.
The 5 properties plotted are:-
- Ramachandran plot quality assessment - giving the percentage of
residues in the "core" region of the Ramachandran plot.
- Main-chain hydrogen bond energies - giving the standard
deviation of the hydrogen bond energies for main-chain hydrogen bonds. The
energies are calculated using the method of Kabsch & Sander (1983).
- Chi-1 pooled standard deviations - giving the standard
diviations of the chi-1 values from their nearest favoured
conformation (ie gauche minus, trans and chi1
gauche).
- Standard deviation of Chi-2 trans angle - giving the standard
deviation of only the trans chi-2 dihedral angles.
- Overall G-factor - giving a measure of the overall `normality'
of the structure from an average of all the different G-factors for each
residue in the structure.
The first 4 of these properties were found to correlate
with resolution by Morris et al.
(1992). The fifth also shows a good correlation (Laskowski R A,
unpublished results).
Options
The main options for the Equivalent resolution are:-
- The colours used for the plots.
- The plot can be in colour or black-and-white.
These options can be altered by editing the parameter file,
procheck_nmr.prm, as described here.
PROCHECK-NMR - Sample plots