3AL3

Crystal Structure of TopBP1 BRCT7/8-BACH1 peptide complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.196 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Molecular basis of BACH1/FANCJ recognition by TopBP1 in DNA replication checkpoint control

Leung, C.C.Gong, Z.Chen, J.Glover, J.N.

(2011) J.Biol.Chem. 286: 4292-4301

  • DOI: 10.1074/jbc.M110.189555
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The diverse roles of TopBP1 in DNA replication and checkpoint signaling are associated with the scaffolding ability of TopBP1 to initiate various protein-protein interactions. The recognition of the BACH1/FANCJ helicase by TopBP1 is critical for the ...

    The diverse roles of TopBP1 in DNA replication and checkpoint signaling are associated with the scaffolding ability of TopBP1 to initiate various protein-protein interactions. The recognition of the BACH1/FANCJ helicase by TopBP1 is critical for the activation of the DNA replication checkpoint at stalled replication forks and is facilitated by the C-terminal tandem BRCT7/8 domains of TopBP1 and a phosphorylated Thr(1133) binding motif in BACH1. Here we provide the structural basis for this interaction through analysis of the x-ray crystal structures of TopBP1 BRCT7/8 both free and in complex with a BACH1 phospho-peptide. In contrast to canonical BRCT-phospho-peptide recognition, TopBP1 BRCT7/8 undergoes a dramatic conformational change upon BACH1 binding such that the two BRCT repeats pivot about the central BRCT-BRCT interface to provide an extensive and deep peptide-binding cleft. Additionally, we provide the first structural mechanism for Thr(P) recognition among BRCT domains. Together with systematic mutagenesis studies, we highlight the role of key contacts in governing the unique specificity of the TopBP1-BACH1 interaction.


    Organizational Affiliation

    Department of Biochemistry, School of Molecular and Systems Medicine, University of Alberta, Edmonton, Alberta T6G 2H7, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DNA topoisomerase 2-binding protein 1
A
235Homo sapiensMutation(s): 0 
Gene Names: TOPBP1 (KIAA0259)
Find proteins for Q92547 (Homo sapiens)
Go to Gene View: TOPBP1
Go to UniProtKB:  Q92547
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Peptide of Fanconi anemia group J protein
B
10Homo sapiensMutation(s): 0 
Gene Names: BRIP1 (BACH1, FANCJ)
EC: 3.6.4.13
Find proteins for Q9BX63 (Homo sapiens)
Go to Gene View: BRIP1
Go to UniProtKB:  Q9BX63
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FMT
Query on FMT

Download SDF File 
Download CCD File 
A
FORMIC ACID
C H2 O2
BDAGIHXWWSANSR-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
TPO
Query on TPO
B
L-PEPTIDE LINKINGC4 H10 N O6 PTHR
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.196 
  • Space Group: P 62 2 2
Unit Cell:
Length (Å)Angle (°)
a = 78.069α = 90.00
b = 78.069β = 90.00
c = 136.766γ = 120.00
Software Package:
Software NamePurpose
PHASERphasing
HKL-2000data collection
DENZOdata reduction
HKL-2000data scaling
PDB_EXTRACTdata extraction
REFMACrefinement
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-12-01
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2011-11-30
    Type: Database references
  • Version 1.3: 2017-10-11
    Type: Refinement description