Figure 2.

Structural and prestress analysis of 667 proteins. The error bar represents the standard deviation of the mean. (Solid) −RHStaple disulfide bonds; (shaded) −/+RHHook; (open) other types. (A) Pie chart of the sample sizes for each type of disulfide bonds. There are 115 −RHStaple disulfide bonds and 270 −/+RHHook disulfide bonds. All 20 types of disulfide bonds are shown by order of occurrences. (B–D) 20 types of disulfide bonds are shown in the same order as panel A. (B) Mean of S-S bond lengths for each type of disulfide bond. (C) Mean C-S-S angles for each type of disulfide bond. (D) Mean prestress between two adjacent cysteine residues for each type of disulfide bond, including all interactions (left block), only including bonded interactions (middle block), and only including nonbonded interactions (right block).