3VGO

Crystal structure of the N-terminal fragment of Cbl-b


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.328 
  • R-Value Work: 0.270 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Autoinhibition and phosphorylation-induced activation mechanisms of human cancer and autoimmune disease-related E3 protein Cbl-b

Kobashigawa, Y.Tomitaka, A.Kumeta, H.Noda, N.N.Yamaguchi, M.Inagaki, F.

(2011) Proc.Natl.Acad.Sci.USA 108: 20579-20584

  • DOI: 10.1073/pnas.1110712108
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Cbl-b is a RING-type E3 ubiquitin ligase that functions as a negative regulator of T-cell activation and growth factor receptor and nonreceptor-type tyrosine kinase signaling. Cbl-b dysfunction is related to autoimmune diseases and cancers in humans. ...

    Cbl-b is a RING-type E3 ubiquitin ligase that functions as a negative regulator of T-cell activation and growth factor receptor and nonreceptor-type tyrosine kinase signaling. Cbl-b dysfunction is related to autoimmune diseases and cancers in humans. However, the molecular mechanism regulating its E3 activity is largely unknown. NMR and small-angle X-ray scattering analyses revealed that the unphosphorylated N-terminal region of Cbl-b forms a compact structure by an intramolecular interaction, which masks the interaction surface of the RING domain with an E2 ubiquitin-conjugating enzyme. Phosphorylation of Y363, located in the helix-linker region between the tyrosine kinase binding and the RING domains, disrupts the interdomain interaction to expose the E2 binding surface of the RING domain. Structural analysis revealed that the phosphorylated helix-RING region forms a compact structure in solution. Moreover, the phosphate group of pY363 is located in the vicinity of the interaction surface with UbcH5B to increase affinity by reducing their electrostatic repulsion. Thus, the phosphorylation of Y363 regulates the E3 activity of Cbl-b by two mechanisms: one is to remove the masking of the RING domain from the tyrosine kinase binding domain and the other is to form a surface to enhance binding affinity to E2.


    Organizational Affiliation

    Department of Structural Biology, Faculty of Advanced Life Science, and Graduate School of Life Science, Hokkaido University, Sapporo, Hokkaido 001-0021, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
E3 ubiquitin-protein ligase CBL-B
A, B, C
394Homo sapiensMutation(s): 0 
Gene Names: CBLB (RNF56)
EC: 2.3.2.27
Find proteins for Q13191 (Homo sapiens)
Go to Gene View: CBLB
Go to UniProtKB:  Q13191
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.328 
  • R-Value Work: 0.270 
  • Space Group: P 31
Unit Cell:
Length (Å)Angle (°)
a = 98.876α = 90.00
b = 98.876β = 90.00
c = 105.182γ = 120.00
Software Package:
Software NamePurpose
HKL-2000data reduction
CNSrefinement
HKL-2000data collection
HKL-2000data scaling
CNSphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-12-14
    Type: Initial release
  • Version 1.1: 2013-07-10
    Type: Database references