1UKL

Crystal structure of Importin-beta and SREBP-2 complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.239 

wwPDB Validation 3D Report Full Report


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: 10.1126/science.1088372

  • 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. ...

    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

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Importin beta-1 subunit
A, B
876Mus musculusMutation(s): 0 
Gene Names: Kpnb1 (Impnb)
Find proteins for P70168 (Mus musculus)
Go to UniProtKB:  P70168
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Sterol regulatory element binding protein-2
C, D, E, F
61Homo sapiensMutation(s): 0 
Gene Names: SREBF2 (BHLHD2, SREBP2)
Find proteins for Q12772 (Homo sapiens)
Go to Gene View: SREBF2
Go to UniProtKB:  Q12772
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 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 = 90.00
b = 113.285β = 90.00
c = 240.044γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SOLVEphasing
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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