3L82

X-ray Crystal structure of TRF1 and Fbx4 complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.237 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural Basis of Selective Ubiquitination of TRF1 by SCF(Fbx4)

Zeng, Z.Wang, W.Yang, Y.Chen, Y.Yang, X.Diehl, J.A.Liu, X.Lei, M.

(2010) Dev.Cell 18: 214-225

  • DOI: 10.1016/j.devcel.2010.01.007

  • PubMed Abstract: 
  • TRF1 is a critical regulator of telomere length. As such, TRF1 levels are regulated by ubiquitin-dependent proteolysis via an SCF E3 ligase where Fbx4 contributes to substrate specification. Here, we report the crystal structure of the Fbx4-TRF1 comp ...

    TRF1 is a critical regulator of telomere length. As such, TRF1 levels are regulated by ubiquitin-dependent proteolysis via an SCF E3 ligase where Fbx4 contributes to substrate specification. Here, we report the crystal structure of the Fbx4-TRF1 complex at 2.4 A resolution. Fbx4 contains an unusual substrate-binding domain that adopts a small GTPase fold. Strikingly, this atypical GTPase domain of Fbx4 binds to a globular domain of TRF1 through an intermolecular beta sheet, instead of recognizing short peptides/degrons as often seen in other F-box protein-substrate complexes. Importantly, mutations in this interface abrogate Fbx4-dependent TRF1 binding and ubiquitination. Furthermore, the data demonstrate that recognition of TRF1 by SCF(Fbx4) is regulated by another telomere protein, TIN2. Our results reveal an atypical small GTPase domain within Fbx4 as a substrate-binding motif for SCF(Fbx4) and uncover a mechanism for selective ubiquitination and degradation of TRF1 in telomere homeostasis control.


    Organizational Affiliation

    Howard Hughes Medical Institute, University of Michigan Medical School, 1150 West Medical Center Drive, Ann Arbor, MI 48109, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Telomeric repeat-binding factor 1
A
215Homo sapiensMutation(s): 0 
Gene Names: TERF1 (PIN2, TRBF1, TRF, TRF1)
Find proteins for P54274 (Homo sapiens)
Go to Gene View: TERF1
Go to UniProtKB:  P54274
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
F-box only protein 4
B
227Homo sapiensMutation(s): 0 
Gene Names: FBXO4 (FBX4)
Find proteins for Q9UKT5 (Homo sapiens)
Go to Gene View: FBXO4
Go to UniProtKB:  Q9UKT5
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.237 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 68.097α = 90.00
b = 68.097β = 90.00
c = 234.421γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
CNSrefinement
HKL-2000data scaling
SHARPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-03-09
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2013-09-25
    Type: Derived calculations