Pepstatins are potent inhibitors of aspartic proteases, featuring two statine residues crucial for target binding, however, their biosynthesis is elusive. Here, the authors discover and characterize an unconventional gene cluster responsible for pepstatin biosynthesis, and characterize the role of PepI, an F420H2-dependent oxidoreductase catalysing the tandem reduction of β-keto pepstatin intermediates.
- Jingjun Mo
- Asfandyar Sikandar
- Chengzhang Fu