1UKL

Crystal structure of Importin-beta and SREBP-2 complex

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.239 

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This is version 1.2 of the entry. See complete history. 


Literature

The Structure of Importin-beta Bound to SREBP-2: Nuclear Import of a Transcription Factor

Lee, S.J., Sekimoto, T., Yamashita, E., Nagoshi, E., Nakagawa, A., Imamoto, N., Yoshimura, M., Sakai, H., Chong, K.T., Tsukihara, T., Yoneda, Y.

(2003) Science 302: 1571-1575

  • DOI: https://doi.org/10.1126/science.1088372
  • Primary Citation of Related Structures:  
    1UKL

  • PubMed Abstract: 

    • The sterol regulatory element-binding protein 2 (SREBP-2), a nuclear transcription factor that is essential for cholesterol metabolism, enters the nucleus through a direct interaction of its helix-loop-helix leucine zipper domain with importin-beta. We show the crystal structure of importin-beta complexed with the active form of SREBP-2 ...

    The sterol regulatory element-binding protein 2 (SREBP-2), a nuclear transcription factor that is essential for cholesterol metabolism, enters the nucleus through a direct interaction of its helix-loop-helix leucine zipper domain with importin-beta. We show the crystal structure of importin-beta complexed with the active form of SREBP-2. Importin-beta uses characteristic long helices like a pair of chopsticks to interact with an SREBP-2 dimer. Importin-beta changes its conformation to reveal a pseudo-twofold symmetry on its surface structure so that it can accommodate a symmetric dimer molecule. Importin-beta may use a similar strategy to recognize other dimeric cargoes.

    Organizational Affiliation: 

    Institute for Protein Research, Graduate School of Frontier Biosciences, Osaka University, Yamadaoka 2-2, Suita, Osaka 565-0871, Japan.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Importin beta-1 subunitA, B876Mus musculusMutation(s): 0 
Gene Names: Kpnb1, Impnb
UniProt
Find proteins for P70168 (Mus musculus)
Explore P70168 
Go to UniProtKB:  P70168
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP70168
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Sterol regulatory element binding protein-2C, D, E, F61Homo sapiensMutation(s): 3 
Gene Names: SREBF2, BHLHD2, SREBP2
UniProt & NIH Common Fund Data Resources
Find proteins for Q12772 (Homo sapiens)
Explore Q12772 
Go to UniProtKB:  Q12772
PHAROS:  Q12772
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ12772
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE		C, D, E, F L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.239 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 101.092α = 90
b = 113.285β = 90
c = 240.044γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
SOLVEphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-12-09
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance