Fig. 1: Representative structures of the closed and open states of DRV-bound HIV-PR protease.

The two spheres denote the center of mass of the Cα atoms of residues Met46 to Lys55 in the two monomers; the flap distance df is the distance between them. The closed conformation (df = 1.03 nm) is from crystal structure (Protein Data Bank (PDB): 1T3R), and the open conformation (df = 2.73 nm) is from a natural reactive trajectory of DRV dissociation. Different structural segments are marked by different colors. Source data are provided as a Source Data file.