(a, b) Bottom view (a) and side view (b) of the complex structure. The ribbon model represents Keap1-DC and the stick model shows p62-KIR. Each β-propeller blade is numbered from 1 to 6. (c) The simulated-annealing Fo − Fc omit map is contoured at 3 σ. p62-KIR (pink) was omitted from the calculation. The electron density of the peptide-bound region V348 to L355 of p62-KIR was unambiguously visible. (d) Intermolecular hydrogen bonds of Keap1-DC in complex with p62-KIR (left; PDB ID 3ADE) and in complex with the Nrf2-ETGE region (right; PDB ID 1x2r). (e) Intra-peptide hydrogen bonds of p62-KIR in the Keap1-DC complex. Hydrogen bonds (green broken lines) and their distances (Å) are displayed in d and e. 