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: 33.69 kDa 
• Atom Count: 2527 
• Residue Count: 288 
• Unique protein chains: 1

1U6D

Crystal structure of the Kelch domain of human Keap1

• DOI: 10.2210/pdb1U6D/pdb

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


• Deposited: 2004-07-29 Released: 2004-10-12 
• Deposition Author(s): Li, X., Zhang, D., Hannink, M., Beamer, L.J.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.85 Å
• R-Value Free: 0.182 
• R-Value Work: 0.148 
• R-Value Observed: 0.149 

Literature

Crystal structure of the kelch domain of human keap1

Li, X., Zhang, D., Hannink, M., Beamer, L.J.

(2004) J Biol Chem 279: 54750-54758

• PubMed: 15475350 
• DOI: 10.1074/jbc.M410073200
• Primary Citation of Related Structures:  
  1U6D


• PubMed Abstract: 
  

Keap1 is a substrate adaptor protein for an ubiquitin ligase complex that targets the Nrf2 transcription factor for degradation. Keap1 binds Nrf2 through its C-terminal Kelch domain, which contains six copies of the evolutionarily conserved kelch repeat sequence motif. The structure of the Kelch domain from human Keap1 has been determined by x-ray crystallography to a resolution of 1.85 A. The Kelch domain forms a 6-bladed beta-propeller structure, with residues at the C terminus forming the first strand in the first blade. Key structural roles have been identified for the highly conserved glycine, tyrosine, and tryptophan residues that define the kelch repeat sequence motif. In addition, we show that substitution of a single amino acid located within a loop that extends out from the bottom of the beta-propeller structure abolishes binding of Nrf2. The structure of the Kelch domain of Keap1 represents a high quality model for the superfamily of eukaryotic kelch repeat proteins and provides insight into how disease-causing mutations perturb the structural integrity of the Kelch domain.

---

Related Citations: 

• Crystallization and initial crystallographic analysis of the Kelch domain from human Keap1
  Li, X., Zhang, D., Hannink, M., Beamer, L.J.
  (2004) Acta Crystallogr D Biol Crystallogr 60: 2346

---

Organizational Affiliation: 

Department of Biochemistry, University of Misouri-Columbia, Misouri 65211, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
kelch-like ECH-associated protein 1	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

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.85 Å
• R-Value Free: 0.182 
• R-Value Work: 0.148 
• R-Value Observed: 0.149 
• Space Group: P 6₅ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 85.892	α = 90
b = 85.892	β = 90
c = 148.753	γ = 120

Software Package:

Software Name	Purpose
REFMAC	refinement
DENZO	data reduction
CCP4	data scaling
SOLVE	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-07-29 
• Released Date: 2004-10-12 
Deposition Author(s): Li, X., Zhang, D., Hannink, M., Beamer, L.J.

Revision History 

• Version 1.0: 2004-10-12
  Type: Initial release
  
• Version 1.1: 2008-04-30
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance