Discovery and development of HIV-protease inhibitors
Many major physiological processes depend on regulation of proteolytic enzyme activity and there can be dramatic consequences when equilibrium between an enzyme and its substrates is disturbed. In this prospective, the discovery of small-molecule ligands, like protease inhibitors, that can modulate catalytic activities has an enormous therapeutic effect.
Source: Wikipedia — Discovery and development of HIV-protease inhibitors (CC BY-SA 4.0)