Biological Assembly 1  

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - AB 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 126324.53 
• Atom Count: 8098 
• Residue Count: 1121 
• Unique protein chains: 2

2XWU

CRYSTAL STRUCTURE OF IMPORTIN 13 - UBC9 COMPLEX

• DOI: 10.2210/pdb2XWU/pdb

• Classification: LIGASE/NUCLEAR PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli


• Deposited: 2010-11-05 Released: 2010-12-29 
• Deposition Author(s): Gruenwald, M., Bono, F.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.8 Å
• R-Value Free: 0.268 
• R-Value Work: 0.226 

Literature

Structure of Importin13-Ubc9 Complex: Nuclear Import and Release of a Key Regulator of Sumoylation.

Gruenwald, M., Bono, F.

(2011) Embo J. 30: 427

• PubMed: 21139563 
• DOI: 10.1038/emboj.2010.320


• PubMed Abstract: 
  

Importin13 (Imp13) is an unusual β-karyopherin that is able to both import and export cargoes in and out of the nucleus. In the cytoplasm, Imp13 associates with different cargoes such as Mago-Y14 and Ubc9, and facilitates their import into the nucleus where RanGTP binding promotes the release of the cargo. In this study, we present the 2.8 Å resolution crystal structure of Imp13 in complex with the SUMO E2-conjugating enzyme, Ubc9. The structure shows an uncommon mode of cargo-karyopherin recognition with Ubc9 binding at the N-terminal portion of Imp13, occupying the entire RanGTP-binding site. Comparison of the Imp13-Ubc9 complex with Imp13-Mago-Y14 shows the remarkable plasticity of Imp13, whose conformation changes from a closed ring to an open superhelix when bound to the two different cargoes. The structure also shows that the binding mode is compatible with the sumoylated states of Ubc9. Indeed, we find that Imp13 is able to bind sumoylated Ubc9 in vitro and suppresses autosumoylation activity in the complex.

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Organizational Affiliation: 

Max Planck Institute for Developmental Biology, Tübingen, Germany.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
SUMO-CONJUGATING ENZYME UBC9	A	158	Homo sapiens	Mutation(s): 0  Gene Names: UBE2I (UBC9, UBCE9) EC: 2.3.2.-
Find proteins for P63279 (Homo sapiens) Go to Gene View: UBE2I Go to UniProtKB:  P63279

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
IMPORTIN13	B	963	Homo sapiens	Mutation(s): 0  Gene Names: IPO13 (KIAA0724, RANBP13)
Find proteins for O94829 (Homo sapiens) Go to Gene View: IPO13 Go to UniProtKB:  O94829

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.8 Å
• R-Value Free: 0.268 
• R-Value Work: 0.226 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 68.700	α = 90.00
b = 126.800	β = 90.00
c = 184.000	γ = 90.00

Software Package:

Software Name	Purpose
CNS	refinement
XSCALE	data scaling
XDS	data reduction
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2010-11-05 
• Released Date: 2010-12-29 
• Deposition Author(s): Gruenwald, M., Bono, F.

Revision History 

• Version 1.0: 2010-12-29
  Type: Initial release
• Version 1.1: 2011-05-08
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance