3FSH

Crystal structure of the ubiquitin conjugating enzyme Ube2g2 bound to the G2BR domain of ubiquitin ligase gp78


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.76 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.216 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Mechanistic insights into active site-associated polyubiquitination by the ubiquitin-conjugating enzyme Ube2g2.

Li, W.Tu, D.Li, L.Wollert, T.Ghirlando, R.Brunger, A.T.Ye, Y.

(2009) Proc.Natl.Acad.Sci.USA 106: 3722-3727

  • DOI: 10.1073/pnas.0808564106

  • PubMed Abstract: 
  • Lys-48-linked polyubiquitination regulates a variety of cellular processes by targeting ubiquitinated proteins to the proteasome for degradation. Although polyubiquitination had been presumed to occur by transferring ubiquitin molecules, one at a tim ...

    Lys-48-linked polyubiquitination regulates a variety of cellular processes by targeting ubiquitinated proteins to the proteasome for degradation. Although polyubiquitination had been presumed to occur by transferring ubiquitin molecules, one at a time, from an E2 active site to a substrate, we recently showed that the endoplasmic reticulum-associated RING finger ubiquitin ligase gp78 can mediate the preassembly of Lys-48-linked polyubiquitin chains on the catalytic cysteine of its cognate E2 Ube2g2 and subsequent transfer to a substrate. Active site-linked polyubiquitin chains are detected in cells on Ube2g2 and its yeast homolog Ubc7p, but how these chains are assembled is unclear. Here, we show that gp78 forms an oligomer via 2 oligomerization sites, one of which is a hydrophobic segment located in the gp78 cytosolic domain. We further demonstrate that a gp78 oligomer can simultaneously associate with multiple Ube2g2 molecules. This interaction is mediated by a novel Ube2g2 surface distinct from the predicted RING binding site. Our data suggest that a large gp78-Ube2g2 heterooligomer brings multiple Ube2g2 molecules into close proximity, allowing ubiquitin moieties to be transferred between neighboring Ube2g2s to form active site-linked polyubiquitin chains.


    Organizational Affiliation

    Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ubiquitin-conjugating enzyme E2 G2
A, B
168Mus musculusMutation(s): 0 
Gene Names: Ube2g2
EC: 2.3.2.23
Find proteins for P60605 (Mus musculus)
Go to UniProtKB:  P60605
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Autocrine motility factor receptor, isoform 2
C
28Homo sapiensMutation(s): 0 
Gene Names: AMFR (RNF45)
EC: 2.3.2.27
Find proteins for Q9UKV5 (Homo sapiens)
Go to Gene View: AMFR
Go to UniProtKB:  Q9UKV5
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.76 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.216 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 105.719α = 90.00
b = 105.719β = 90.00
c = 142.855γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
HKL-2000data scaling
CNSrefinement
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2009-01-09 
  • Released Date: 2009-02-10 
  • Deposition Author(s): Tu, D., Brunger, A.T.

Revision History 

  • Version 1.0: 2009-02-10
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance