Figure 3.

Illustration of interatomic interactions occurring around residue 268 in the WT (wild-type), and Y268C, Y268N, Y268S mutant proteins. Residue 268 in the WT and mutant proteins is colored in light green and shown as sticks. The respective chemical interactions are labeled as dotted lines and colored as follows: Hydrogen bond—(red), weak hydrogen bonds—(orange), hydrophobic contacts—(green), amide-amide contact—(blue) and ionic interactions—(gold). Amino acid residues are also colored according to type, namely; nitrogen (blue), oxygen (red) and sulphur (yellow).