Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 33.03 kDa 
• Atom Count: 2334 
• Modelled Residue Count: 294 
• Deposited Residue Count: 302 
• Unique protein chains: 2

6T7V

KEAP1 IN COMPLEX WITH PEPTIDE 8

• PDB DOI: 10.2210/pdb6T7V/pdb

• Classification: TRANSCRIPTION
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2019-10-23 Released: 2020-09-09 
• Deposition Author(s): Colarusso, S.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 0.275 
• R-Value Work: 0.202 
• R-Value Observed: 0.207 

Literature

Optimization of linear and cyclic peptide inhibitors of KEAP1-NRF2 protein-protein interaction.

Colarusso, S., De Simone, D., Frattarelli, T., Andreini, M., Cerretani, M., Missineo, A., Moretti, D., Tambone, S., Kempf, G., Augustin, M., Steinbacher, S., Munoz-Sanjuan, I., Park, L., Summa, V., Tomei, L., Bresciani, A., Dominguez, C., Toledo-Sherman, L., Bianchi, E.

(2020) Bioorg Med Chem 28: 115738-115738

• PubMed: 33065433 
• DOI: 10.1016/j.bmc.2020.115738
• Primary Citation of Related Structures:  
  6T7V, 6T7Z


• PubMed Abstract: 
  

Inhibition of KEAP1-NRF2 protein-protein interaction is considered a promising strategy to selectively and effectively activate NRF2, a transcription factor which is involved in several pathologies such as Huntington's disease (HD). A library of linear peptides based on the NRF2-binding motifs was generated on the nonapeptide lead Ac-LDEETGEFL-NH ₂ spanning residues 76-84 of the Neh2 domain of NRF2 with the aim to replace E78, E79 and E82 with non-acidic amino acids. A deeper understanding of the features and accessibility of the T80 subpocket was also targeted by structure-based design. Approaches to improve cell permeability were investigated using both different classes of cyclic peptides and conjugation to cell-penetrating peptides. This insight will guide future design of macrocycles, peptido-mimetics and, most importantly, small neutral brain-penetrating molecules to evaluate whether NRF2 activators have utility in HD.

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Organizational Affiliation: 

Department of Drug Discovery, IRBM Spa, Via Pontina km 30.600, 00071 Pomezia, Rome, Italy.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Kelch-like ECH-associated protein 1	A	293	Homo sapiens	Mutation(s): 0  Gene Names: KEAP1, INRF2, KIAA0132, KLHL19
UniProt & NIH Common Fund Data Resources
Find proteins for Q14145 (Homo sapiens) Explore Q14145  Go to UniProtKB:  Q14145
PHAROS:  Q14145

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
LEU-ASP-PRO-GLU-THR-GLY-GLU-PHE-LEU	B [auth I]	9	Homo sapiens	Mutation(s): 0  Gene Names: NFE2L2, NRF2
UniProt & NIH Common Fund Data Resources
Find proteins for Q16236 (Homo sapiens) Explore Q16236  Go to UniProtKB:  Q16236
PHAROS:  Q16236

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ACT	C [auth A]	ACETATE ION C2 H3 O2 QTBSBXVTEAMEQO-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 0.275 
• R-Value Work: 0.202 
• R-Value Observed: 0.207 
• Space Group: P 3₂ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 75.43	α = 90
b = 75.43	β = 90
c = 114.497	γ = 120

Software Package:

Software Name	Purpose
REFMAC	refinement
PDB_EXTRACT	data extraction
XDS	data reduction
XSCALE	data scaling
MOLREP	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2019-10-23 
• Released Date: 2020-09-09 
Deposition Author(s): Colarusso, S.

Revision History  

• Version 1.0: 2020-09-09
  Type: Initial release
  
• Version 1.1: 2020-10-28
  Changes: Database references