Crystal structure of ChREBP NLS peptide bound to importin alpha.

Experimental Data Snapshot

  • Resolution: 2.50 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.200 

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The structure of importin alpha and the nuclear localization peptide of ChREBP, and small compound inhibitors of ChREBP-importin alpha interactions.

Jung, H.Takeshima, T.Nakagawa, T.MacMillan, K.S.Wynn, R.M.Wang, H.Sakiyama, H.Wei, S.Li, Y.Bruick, R.K.Posner, B.A.De Brabander, J.K.Uyeda, K.

(2020) Biochem J 477: 3253-3269

  • DOI: https://doi.org/10.1042/BCJ20200520
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The carbohydrate response element binding protein (ChREBP) is a glucose-responsive transcription factor that plays a critical role in glucose-mediated induction of genes involved in hepatic glycolysis and lipogenesis. In response to fluctuating blood glucose levels ChREBP activity is regulated mainly by nucleocytoplasmic shuttling of ChREBP. Under high glucose ChREBP binds to importin α and importin β and translocates into the nucleus to initiate transcription. We have previously shown that the nuclear localization signal site (NLS) for ChREBP is bipartite with the NLS extending from Arg158 to Lys190. Here, we report the 2.5 Å crystal structure of the ChREBP-NLS peptide bound to importin α. The structure revealed that the NLS binding is monopartite, with the amino acid residues K171RRI174 from the ChREBP-NLS interacting with ARM2-ARM5 on importin α. We discovered that importin α also binds to the primary binding site of the 14-3-3 proteins with high affinity, which suggests that both importin α and 14-3-3 are each competing with the other for this broad-binding region (residues 117-196) on ChREBP. We screened a small compound library and identified two novel compounds that inhibit the ChREBP-NLS/importin α interaction, nuclear localization, and transcription activities of ChREBP. These candidate molecules support developing inhibitors of ChREBP that may be useful in treatment of obesity and the associated diseases.

  • Organizational Affiliation

    Department of Biochemistry, University of Texas Southwestern Medical Center at Dallas, Dallas, Texas 75390, U.S.A.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Importin subunit alpha-1A [auth B]426Mus musculusMutation(s): 0 
Gene Names: Kpna2Rch1
UniProt & NIH Common Fund Data Resources
Find proteins for P52293 (Mus musculus)
Explore P52293 
Go to UniProtKB:  P52293
IMPC:  MGI:103561
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP52293
Sequence Annotations
  • Reference Sequence

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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
ChREBP Peptide ASN-TYR-TRP-LYS-ARG-ARG-ILE-GLU-VALB [auth A]9Homo sapiensMutation(s): 0 
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Find proteins for Q9NP71 (Homo sapiens)
Explore Q9NP71 
Go to UniProtKB:  Q9NP71
GTEx:  ENSG00000009950 
Entity Groups  
UniProt GroupQ9NP71
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.50 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.200 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 77.434α = 90
b = 89.691β = 90
c = 96.332γ = 90
Software Package:
Software NamePurpose
HKL-3000data reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-09-25
    Type: Initial release
  • Version 1.1: 2020-10-07
    Changes: Database references
  • Version 1.2: 2024-03-13
    Changes: Data collection, Database references