Figure 3
From: Deciphering the shape and deformation of secondary structures through local conformation analysis
Structural characteristics of the structural letters. Structural descriptors analysis of surface-letters (red), core-letters (blue), non-interface-letters (square), interface-letter (triangle) and non characterized ones (black). A) Principal Component Analysis performed on the structural descriptors d1, d2, d3 and P4 of the 27 structural letters. The first component is associated with 58% of variability, the second one to 29% of variability and the third and fourth axis to 7% and 6% respectively. Plain lines separate letters according to their secondary structural types. B) Correlation plot d3/P4, d3/d1 and msa/d3 for loop-letters. Msa (Mean solvent accessibility) are computed for the surface compartment but similar observations are made for the interface compartment. C) Correlation plots d3/P4, d3/d1 and msa/d2 for α- and β-letters. Msa stands for the mean relative solvent accessibilities, it is calculated for each letter in the surface compartment of the complete dataset.