4ICV

Ubiquitin-like domain of human tubulin folding cofactor E - crystal form B


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.45 Å
  • R-Value Free: 0.189 
  • R-Value Work: 0.162 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

The structure of the complex between alpha-tubulin, TBCE and TBCB reveals a tubulin dimer dissociation mechanism.

Serna, M.Carranza, G.Martin-Benito, J.Janowski, R.Canals, A.Coll, M.Zabala, J.C.Valpuesta, J.M.

(2015) J.Cell.Sci. 128: 1824-1834

  • DOI: 10.1242/jcs.167387
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Tubulin proteostasis is regulated by a group of molecular chaperones termed tubulin cofactors (TBC). Whereas tubulin heterodimer formation is well-characterized biochemically, its dissociation pathway is not clearly understood. Here, we carried out b ...

    Tubulin proteostasis is regulated by a group of molecular chaperones termed tubulin cofactors (TBC). Whereas tubulin heterodimer formation is well-characterized biochemically, its dissociation pathway is not clearly understood. Here, we carried out biochemical assays to dissect the role of the human TBCE and TBCB chaperones in α-tubulin-β-tubulin dissociation. We used electron microscopy and image processing to determine the three-dimensional structure of the human TBCE, TBCB and α-tubulin (αEB) complex, which is formed upon α-tubulin-β-tubulin heterodimer dissociation by the two chaperones. Docking the atomic structures of domains of these proteins, including the TBCE UBL domain, as we determined by X-ray crystallography, allowed description of the molecular architecture of the αEB complex. We found that heterodimer dissociation is an energy-independent process that takes place through a disruption of the α-tubulin-β-tubulin interface that is caused by a steric interaction between β-tubulin and the TBCE cytoskeleton-associated protein glycine-rich (CAP-Gly) and leucine-rich repeat (LRR) domains. The protruding arrangement of chaperone ubiquitin-like (UBL) domains in the αEB complex suggests that there is a direct interaction of this complex with the proteasome, thus mediating α-tubulin degradation.


    Organizational Affiliation

    Departamento de Estructura de Macromoléculas, Centro Nacional de Biotecnología (CNB-CSIC), Madrid 28049, Spain.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Tubulin-specific chaperone E
A
85Homo sapiensMutation(s): 0 
Gene Names: TBCE
Find proteins for Q15813 (Homo sapiens)
Go to Gene View: TBCE
Go to UniProtKB:  Q15813
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PR
Query on PR

Download SDF File 
Download CCD File 
A
PRASEODYMIUM ION
Pr
WCWKKSOQLQEJTE-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.45 Å
  • R-Value Free: 0.189 
  • R-Value Work: 0.162 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 42.270α = 90.00
b = 65.830β = 90.00
c = 73.570γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
SCALAdata scaling
SHELXSphasing
DNAdata collection
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-06-18
    Type: Initial release
  • Version 1.1: 2016-06-22
    Type: Database references