2QJ0

Structure of the yeast U-box-containing ubiquitin ligase Ufd2p


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.65 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.234 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Inaugural Article: Structure and function of the yeast U-box-containing ubiquitin ligase Ufd2p.

Tu, D.Li, W.Ye, Y.Brunger, A.T.

(2007) Proc.Natl.Acad.Sci.Usa 104: 15599-15606

  • DOI: 10.1073/pnas.0701369104
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Proteins conjugated by Lys-48-linked polyubiquitin chains are preferred substrates of the eukaryotic proteasome. Polyubiquitination requires an activating enzyme (E1), a conjugating enzyme (E2), and a ligase (E3). Occasionally, these enzymes only ass ...

    Proteins conjugated by Lys-48-linked polyubiquitin chains are preferred substrates of the eukaryotic proteasome. Polyubiquitination requires an activating enzyme (E1), a conjugating enzyme (E2), and a ligase (E3). Occasionally, these enzymes only assemble short ubiquitin oligomers, and their extension to full length involves a ubiquitin elongating factor termed E4. Ufd2p, as the first E4 identified to date, is involved in the degradation of misfolded proteins of the endoplasmic reticulum and of a ubiquitin-beta-GAL fusion substrate in Saccharomyces cerevisiae. The mechanism of action of Ufd2p is unknown. Here we describe the crystal structure of the full-length yeast Ufd2p protein. Ufd2p has an elongated shape consisting of several irregular Armadillo-like repeats with two helical hairpins protruding from it and a U-box domain flexibly attached to its C terminus. The U-box of Ufd2p has a fold similar to that of the RING (Really Interesting New Gene) domain that is present in certain ubiquitin ligases. Accordingly, Ufd2p has all of the hallmarks of a RING finger-containing ubiquitin ligase: it associates with its cognate E2 Ubc4p via its U-box domain and catalyzes the transfer of ubiquitin from the E2 active site to Ufd2p itself or to an acceptor ubiquitin molecule to form unanchored diubiquitin oligomers. Thus, Ufd2p can function as a bona fide E3 ubiquitin ligase to promote ubiquitin chain elongation on a substrate.


    Organizational Affiliation

    Department of Molecular and Cellular Physiology, Stanford University and Howard Hughes Medical Institute, Stanford, CA 94305, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ubiquitin conjugation factor E4
A
982Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 2 
Gene Names: UFD2
EC: 2.3.2.27
Find proteins for P54860 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P54860
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.65 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.234 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 65.795α = 90.00
b = 122.798β = 90.00
c = 178.856γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data collection
CNSrefinement
CNSphasing
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2007-07-06 
  • Released Date: 2007-09-18 
  • Deposition Author(s): Tu, D., Brunger, A.T.

Revision History 

  • Version 1.0: 2007-09-18
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance