Figure 4. ![]() |
Figure above illustrates the relationship between the RCI value and the local torsion angle variance as determined through extensive database comparisons. Below the black line marked 0o, the baseline global error values are used without further modification. These regions represent rigid segments of secondary structure (usually helices) or well-defined beta-turns. The next increment, marked 10o indicates that residues having RCI values in this interval have a local φ/ψ error of ±10o that must be added to the baseline value. The increment marked at 20o indicates that a local error of ±20o must be added to the baseline value and so on. At the top, one can see a large RCI values indicating that this portion of the polypeptide chain is in a random coil configuration. The local error in this configuration is ±40o. |