3WN7

Crystal Structure of Keap1 in Complex with the N-terminal region of the Nrf2 transcription factor

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.57 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.189 

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Literature

Kinetic, thermodynamic, and structural characterizations of the association between Nrf2-DLGex degron and Keap1

Fukutomi, T., Takagi, K., Mizushima, T., Ohuchi, N., Yamamoto, M.

(2014) Mol Cell Biol 34: 832-846

  • DOI: 10.1128/MCB.01191-13
  • Primary Citation of Related Structures:  
    3WN7

  • PubMed Abstract: 

    • Transcription factor Nrf2 (NF-E2-related factor 2) coordinately regulates cytoprotective gene expression, but under unstressed conditions, Nrf2 is degraded rapidly through Keap1 (Kelch-like ECH-associated protein 1)-mediated ubiquitination. Nrf2 harbors two Keap1-binding motifs, DLG and ETGE ...

    Transcription factor Nrf2 (NF-E2-related factor 2) coordinately regulates cytoprotective gene expression, but under unstressed conditions, Nrf2 is degraded rapidly through Keap1 (Kelch-like ECH-associated protein 1)-mediated ubiquitination. Nrf2 harbors two Keap1-binding motifs, DLG and ETGE. Interactions between these two motifs and Keap1 constitute a key regulatory nexus for cellular Nrf2 activity through the formation of a two-site binding hinge-and-latch mechanism. In this study, we determined the minimum Keap1-binding sequence of the DLG motif, the low-affinity latch site, and defined a new DLGex motif that covers a sequence much longer than that previously defined. We have successfully clarified the crystal structure of the Keap1-DC-DLGex complex at 1.6 Å. DLGex possesses a complicated helix structure, which interprets well the human-cancer-derived loss-of-function mutations in DLGex. In thermodynamic analyses, Keap1-DLGex binding is characterized as enthalpy and entropy driven, while Keap1-ETGE binding is characterized as purely enthalpy driven. In kinetic analyses, Keap1-DLGex binding follows a fast-association and fast-dissociation model, while Keap1-ETGE binding contains a slow-reaction step that leads to a stable conformation. These results demonstrate that the mode of DLGex binding to Keap1 is distinct from that of ETGE structurally, thermodynamically, and kinetically and support our contention that the DLGex motif serves as a converter transmitting environmental stress to Nrf2 induction as the latch site.

    Organizational Affiliation: 

    Department of Medical Biochemistry, Tohoku University Graduate School of Medicine, Sendai, Japan.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Kelch-like ECH-associated protein 1A,
C [auth L]		311Mus musculusMutation(s): 0 
Gene Names: Keap1, Inrf2, Kiaa0132
UniProt
Find proteins for Q9Z2X8 (Mus musculus)
Explore Q9Z2X8 
Go to UniProtKB:  Q9Z2X8
Entity Groups  
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UniProt GroupQ9Z2X8
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Peptide from Nuclear factor erythroid 2-related factor 2B,
D [auth M]		35Mus musculusMutation(s): 0 
Gene Names: Nfe2l2, Nrf2
UniProt
Find proteins for Q60795 (Mus musculus)
Explore Q60795 
Go to UniProtKB:  Q60795
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ60795
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ACT
Query on ACT
Download Ideal Coordinates CCD File 
E [auth A],
F [auth L]		ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.57 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.189 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 66.138α = 90
b = 84.394β = 116.89
c = 69.818γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
MOLREPphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-12-25
    Type: Initial release
  • Version 1.1: 2014-07-16
    Changes: Database references