5O44

Crystal structure of unbranched mixed tri-Ubiquitin chain containing K48 and K63 linkages.

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.14 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.217 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history. 

Literature

The Crystal Structure and Conformations of an Unbranched Mixed Tri-Ubiquitin Chain Containing K48 and K63 Linkages.

Padala, P., Soudah, N., Giladi, M., Haitin, Y., Isupov, M.N., Wiener, R.

(2017) J. Mol. Biol. 429: 3801-3813

  • DOI: 10.1016/j.jmb.2017.10.027

  • PubMed Abstract: 

    • The ability of ubiquitin to function in a wide range of cellular processes is ascribed to its capacity to cause a diverse spectrum of modifications. While a target protein can be modified with monoubiquitin, it can also be modified with ubiquitin cha ...

    The ability of ubiquitin to function in a wide range of cellular processes is ascribed to its capacity to cause a diverse spectrum of modifications. While a target protein can be modified with monoubiquitin, it can also be modified with ubiquitin chains. The latter include seven types of homotypic chains as well as mixed ubiquitin chains. In a mixed chain, not all the isopeptide bonds are restricted to a specific lysine of ubiquitin, resulting in a chain possessing more than one type of linkage. While structural characterization of homotypic chains has been well elucidated, less is known about mixed chains. Here we present the crystal structure of a mixed tri-ubiquitin chain at 3.1-Å resolution. In the structure, the proximal ubiquitin is connected to the middle ubiquitin via K48 and these two ubiquitins adopt a compact structure as observed in K48 di-ubiquitin. The middle ubiquitin links to the distal ubiquitin via its K63 and these ubiquitins adopt two conformations, suggesting a flexible structure. Using small-angle X-ray scattering, we unexpectedly found differences between the conformational ensembles of the above tri-ubiquitin chains and chains possessing the same linkages but in the reverse order. In addition, cleavage of the K48 linkage by DUB is faster if this linkage is at the distal end. Taken together, our results suggest that in mixed chains, not only the type of the linkages but also their sequence determine the structural and functional properties of the chain.

    Organizational Affiliation: 

    Department of Biochemistry and Molecular Biology, the Institute for Medical Research Israel-Canada, Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ubiquitin
A, E
76Musca domesticaMutation(s): 1 
Find proteins for Q45TR8 (Musca domestica)
Go to UniProtKB:  Q45TR8
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Polyubiquitin-B
C, B
74Homo sapiensMutation(s): 0 
Gene Names: UBB
Find proteins for P0CG47 (Homo sapiens)
Go to Gene View: UBB
Go to UniProtKB:  P0CG47
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Polyubiquitin-B
D, F
76Homo sapiensMutation(s): 1 
Gene Names: UBB
Find proteins for P0CG47 (Homo sapiens)
Go to Gene View: UBB
Go to UniProtKB:  P0CG47
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4
Download SDF File 
Download CCD File 
A, B, C, E
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
MG
Query on MG
Download SDF File 
Download CCD File 
A, D, E
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.14 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.217 
  • Space Group: P 61 2 2
Unit Cell:
Length (Å)Angle (°)
a = 110.767α = 90.00
b = 110.767β = 90.00
c = 417.004γ = 120.00
Software Package:
Software NamePurpose
Aimlessdata scaling
MOLREPphasing
XDSdata reduction
xia2data reduction
DMphasing
REFMACrefinement

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Israel--

Revision History 

  • Version 1.0: 2017-11-08
    Type: Initial release
  • Version 1.1: 2017-11-15
    Type: Database references
  • Version 1.2: 2017-12-06
    Type: Database references