Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 35.55 kDa 
• Atom Count: 2728 
• Modelled Residue Count: 301 
• Deposited Residue Count: 324 
• Unique protein chains: 2

2FLU

Crystal Structure of the Kelch-Neh2 Complex

• DOI: 10.2210/pdb2FLU/pdb

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


• Deposited: 2006-01-06 Released: 2006-08-15 
• Deposition Author(s): Li, X., Lo, J., Beamer, L., Hannink, M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.50 Å
• R-Value Free: 0.199 
• R-Value Work: 0.179 
• R-Value Observed: 0.180 

Literature

Structure of the Keap1:Nrf2 interface provides mechanistic insight into Nrf2 signaling.

Lo, S.C., Li, X., Henzl, M.T., Beamer, L.J., Hannink, M.

(2006) EMBO J 25: 3605-3617

• PubMed: 16888629 
• DOI: 10.1038/sj.emboj.7601243
• Primary Citation of Related Structures:  
  2FLU


• PubMed Abstract: 
  

Keap1 is a BTB-Kelch substrate adaptor protein that regulates steady-state levels of Nrf2, a bZIP transcription factor, in response to oxidative stress. We have determined the structure of the Kelch domain of Keap1 bound to a 16-mer peptide from Nrf2 containing a highly conserved DxETGE motif. The Nrf2 peptide contains two short antiparallel beta-strands connected by two overlapping type I beta-turns stabilized by the aspartate and threonine residues. The beta-turn region fits into a binding pocket on the top face of the Kelch domain and the glutamate residues form multiple hydrogen bonds with highly conserved residues in Keap1. Mutagenesis experiments confirmed the role of individual amino acids for binding of Nrf2 to Keap1 and for Keap1-mediated repression of Nrf2-dependent gene expression. Our results provide a detailed picture of how a BTB-Kelch substrate adaptor protein binds to its cognate substrate and will enable the rational design of novel chemopreventive agents.

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Organizational Affiliation: 

Department of Biochemistry, University of Missouri-Columbia, Columbia, MO 65211, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Kelch-like ECH-associated protein 1	A [auth X]	308	Homo sapiens	Mutation(s): 0  Gene Names: KEAP1, INRF2, KIAA0132, KLHL19
Find proteins for Q14145 (Homo sapiens) Explore Q14145  Go to UniProtKB:  Q14145
NIH Common Fund Data Resources
PHAROS:  Q14145 GTEx:  ENSG00000079999

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Nrf2	B [auth P]	16	N/A	Mutation(s): 0
Find proteins for Q16236 (Homo sapiens) Explore Q16236  Go to UniProtKB:  Q16236
NIH Common Fund Data Resources
PHAROS:  Q16236 GTEx:  ENSG00000116044

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.50 Å
• R-Value Free: 0.199 
• R-Value Work: 0.179 
• R-Value Observed: 0.180 
• Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 76.757	α = 90
b = 92.069	β = 90
c = 46.314	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
d*TREK	data scaling
MOLREP	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2006-01-06 
• Released Date: 2006-08-15 
Deposition Author(s): Li, X., Lo, J., Beamer, L., Hannink, M.

Revision History  

• Version 1.0: 2006-08-15
  Type: Initial release
  
• Version 1.1: 2008-05-01
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Advisory, Version format compliance