The Keap1–Nrf2 interaction plays important roles in regulation of Nrf2 activity and induction of chemopreventive enzymes. To better understand the interaction and to determine the minimal Nrf2 sequence required for Keap1 binding, we synthesized a series of Nrf2 peptides containing ETGE motif and determined their binding affinities to the Kelch domain of Keap1 in solution using a surface plasmon resonance‐based competition assay. The equilibrium dissociation constant for the interaction between 16mer Nrf2 peptide and Keap1 Kelch domain in solution () was found to be 23.9 nm, which is 10× lower than the surface binding constant () of 252 nm obtained for the direct binding of Keap1 Kelch domain to the immobilized 16mer Nrf2 peptide on a surface plasmon resonance sensor chip surface. The binding affinity of Nrf2 peptides to Keap1 Kelch domain was not lost until after deletion of eight residues from the N‐terminus of the 16mer Nrf2 peptide. The 9mer Nrf2 peptide has a moderate binding affinity with a of 352 nm and the affinity was increased 15× upon removal of the positive charge at the peptide N‐terminus by acetylation. These results suggest that the minimal Nrf2 peptide sequence required for Keap1 binding is the 9mer sequence of LDEETGEFL.
Appendix S1. Supplementary data.
|CBDD_1240_sm_AppendixS1.doc51.5 KB||Supporting info item|
Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.