FIG 4.

Predicted binding pockets in the CHIKV nsP1 oligomeric structure. (A) Top view of the nsP1 dodecameric ring. Shown are the main binding pocket (pocket 1, in orange) and secondary binding pocket (pocket 2, in blue) predicted by the ICM Pocket Finder method. (B) Front view of the nsP1 dodecameric ring. (C) The predicted main binding pocket is elongated and contains two binding sites virtually divided by the catalytic residues H37 and D63, which correspond to the SAM- and GTP-binding sites. Three consecutive nsP1 protomers, with subscripts n, n+1, and n–1, were used to define these pockets within the nsP1 complex (PDB code 6Z0V).