Thus, the coordinates of the single bondR3R2R1single bond residues were changed according to the single bondKRRsingle bond coordinates of the peptidic inhibitor, while the N5R4_ _ _ S1′AGMI5′ residues were changed according to the backbone of the aprotinin inhibitor (single bondT11G_ _ _ ARIIR20single bond). Then, the side chains of the capsid sequence were added using DS2.5's tool with the newly formed conformation of the NS2B/NS3pro-capsid complex. The complex was subsequently minimized by keeping the P3P2P1-residues and the NS2B/NS3pro fixed. Then, the geometry and stereochemistry of the loops were validated using Ramachandran plots in the Discovery Studio 2.5 program. Ten residues of the capsid cleavage region were located in the favored (92%) and the allowed (8%) regions of the plot, indicating the suitability of this model for further simulation. For the remaining systems, the initial structure of their cleavage regions were constructed using the atomic coordinates of the capsid built as above and then the mutated amino acid residue along each substrate was generated using the build and edit protein tool in DS2.5 program. The sequences and superimposition of the six modeled polypeptide cleavage regions in the binding site of DV2 NS2B/NS3pro are presented in Fig. 1.