Biological Assembly 1  

 3D View: Structure | Ligand Interaction

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

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

Macromolecule Content

• Total Structure Weight: 36628.56 
• Atom Count: 2345 
• Residue Count: 325 
• Unique protein chains: 2

1X2R

Structural basis for the defects of human lung cancer somatic mutations in the repression activity of Keap1 on Nrf2

• DOI: 10.2210/pdb1X2R/pdb

• Classification: TRANSCRIPTION
• Organism(s): Mus musculus
• Expression System: Escherichia coli


• Deposited: 2005-04-26 Released: 2006-03-07 
• Deposition Author(s): Padmanabhan, B., Tong, K.I., Nakamura, Y., Ohta, T., Scharlock, M., Kobayashi, A., Ohtsuji, M., Kang, M.-I., Yamamoto, M., Yokoyama, S., RIKEN Structural Genomics/Proteomics Initiative (RSGI)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.7 Å
• R-Value Free: 0.214 
• R-Value Work: 0.191 

Literature

Structural basis for defects of keap1 activity provoked by its point mutations in lung cancer

Padmanabhan, B., Tong, K.I., Ohta, T., Nakamura, Y., Scharlock, M., Ohtsuji, M., Kang, M.-I., Kobayashi, A., Yokoyama, S., Yamamoto, M.

(2006) Mol.Cell 21: 689-700

• PubMed: 16507366 
• DOI: 10.1016/j.molcel.2006.01.013
• Primary Citation of Related Structures:  
  1X2J


• PubMed Abstract: 
  

Nrf2 regulates the cellular oxidative stress response, whereas Keap1 represses Nrf2 through its molecular interaction. To elucidate the molecular mechanism of the Keap1 and Nrf2 interaction, we resolved the six-bladed beta propeller crystal structure of the Kelch/DGR and CTR domains of mouse Keap1 and revealed that extensive inter- and intrablade hydrogen bonds maintain the structural integrity and proper association of Keap1 with Nrf2. A peptide containing the ETGE motif of Nrf2 binds the beta propeller of Keap1 at the entrance of the central cavity on the bottom side via electrostatic interactions with conserved arginine residues. We found a somatic mutation and a gene variation in human lung cancer cells that change glycine to cysteine in the DGR domain, introducing local conformational changes that reduce Keap1's affinity for Nrf2. These results provide a structural basis for the loss of Keap1 function and gain of Nrf2 function.

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Organizational Affiliation: 

RIKEN Genomic Sciences Center, Tsurumi, Yokohama 230-0045, Japan.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Kelch-like ECH-associated protein 1	A	316	Mus musculus	Mutation(s): 0  Gene Names: Keap1 (Inrf2, Kiaa0132)
Find proteins for Q9Z2X8 (Mus musculus) Go to UniProtKB:  Q9Z2X8

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
Nuclear factor erythroid 2 related factor 2	B	9	Mus musculus	Mutation(s): 0  Gene Names: Nfe2l2 (Nrf-2, Nrf2)
Find proteins for Q60795 (Mus musculus) Go to UniProtKB:  Q60795

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
SO4	A	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.7 Å
• R-Value Free: 0.214 
• R-Value Work: 0.191 
• Space Group: P 6₁

Unit Cell:

Length (Å)	Angle (°)
a = 103.349	α = 90.00
b = 103.349	β = 90.00
c = 55.235	γ = 120.00

Software Package:

Software Name	Purpose
HKL-2000	data reduction
HKL-2000	data collection
SCALEPACK	data scaling
CNS	refinement
MOLREP	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2005-04-26 
• Released Date: 2006-03-07 
• Deposition Author(s): Padmanabhan, B., Tong, K.I., Nakamura, Y., Ohta, T., Scharlock, M., Kobayashi, A., Ohtsuji, M., Kang, M.-I., Yamamoto, M., Yokoyama, S., RIKEN Structural Genomics/Proteomics Initiative (RSGI)

Revision History 

• Version 1.0: 2006-03-07
  Type: Initial release
• Version 1.1: 2008-04-30
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance