1UKL image
Deposition Date 2003-08-26
Release Date 2003-12-09
Last Version Date 2024-10-23
Entry Detail
PDB ID:
1UKL
Keywords:
PROTEIN TRANSPORT/DNA BINDING PROTEIN
Title:
Crystal structure of Importin-beta and SREBP-2 complex
Biological Source:
Source Organism:
Mus musculus (Taxon ID: 10090)
Homo sapiens (Taxon ID: 9606)
Host Organism:
Escherichia coli BL21
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
3.00 Å
R-Value Free:
0.29
R-Value Work:
0.23
Space Group:
P 21 21 21
1UKL validation report
Macromolecular Entities
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Importin beta-1 subunit
Gene (Uniprot):Kpnb1
Chain IDs:A, B
Chain Length:876
Number of Molecules:2
Biological Source:Mus musculus
UniProt ID:P70168 Pfam ID:PF03810, PF13513
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Sterol regulatory element binding protein-2
Gene (Uniprot):SREBF2
Chain IDs:C, D, E, F
Chain Length:61
Number of Molecules:4
Biological Source:Homo sapiens
UniProt ID:Q12772 Pfam ID:PF00010
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MSE C MET SELENOMETHIONINE
Ligand Molecules
NA
Primary Citation
The Structure of Importin-beta Bound to SREBP-2: Nuclear Import of a Transcription Factor
Science 302 1571 1575 (2003)
PMID: 14645851 DOI: 10.1126/science.1088372

Abstact

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.

Legend

Protein

Chemical

Disease

Primary Citation of related structures
1UKL