8Q1Q image
Entry Detail
PDB ID:
8Q1Q
Keywords:
Title:
mouse Keap1 in complex with stapled peptide
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2023-08-01
Release Date:
2023-10-25
Method Details:
Experimental Method:
Resolution:
1.38 Å
R-Value Free:
0.18
R-Value Work:
0.16
R-Value Observed:
0.17
Space Group:
P 61
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Kelch-like ECH-associated protein 1
Chain IDs:A
Chain Length:303
Number of Molecules:1
Biological Source:Mus musculus
Polymer Type:polypeptide(L)
Description:Stapled peptide
Chain IDs:B (auth: D)
Chain Length:14
Number of Molecules:1
Biological Source:synthetic construct
Primary Citation
A cell-active cyclic peptide targeting the Nrf2/Keap1 protein-protein interaction.
Chem Sci 14 10800 10805 (2023)
PMID: 37829032 DOI: 10.1039/d3sc04083f

Abstact

The disruption of the protein-protein interaction (PPI) between Nrf2 and Keap1 is an attractive strategy to counteract the oxidative stress that characterises a variety of severe diseases. Peptides represent a complementary approach to small molecules for the inhibition of this therapeutically important PPI. However, due to their polar nature and the negative net charge required for binding to Keap1, the peptides reported to date exhibit either mid-micromolar activity or are inactive in cells. Herein, we present a two-component peptide stapling strategy to rapidly access a variety of constrained and functionalised peptides that target the Nrf2/Keap1 PPI. The most promising peptide, P8-H containing a fatty acid tag, binds to Keap1 with nanomolar affinity and is effective at inducing transcription of ARE genes in a human lung epithelial cell line at sub-micromolar concentration. Furthermore, crystallography of the peptide in complex with Keap1 yielded a high resolution X-ray structure, adding to the toolbox of structures available to develop cell-permeable peptidomimetic inhibitors.

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