3OLC

Crystal structure of the N-terminal region of TopBP1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.223 

wwPDB Validation   3D Report Full Report


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Literature

Crystal structure of the N-terminal region of human Topoisomerase II beta binding protein 1

Huo, Y.G.Bai, L.Xu, M.Jiang, T.

(2010) Biochem Biophys Res Commun 401: 401-405

  • DOI: 10.1016/j.bbrc.2010.09.066
  • Primary Citation of Related Structures:  
    3OLC

  • PubMed Abstract: 
  • Human DNA Topoisomerase IIβ binding protein 1 (TopBP1) is a modulating protein that plays an essential role in the response to DNA damage. The N-terminal region of TopBP1, which contains predicted BRCA1-carboxy terminal (BRCT) domains 1 and 2, binds to R ...

    Human DNA Topoisomerase IIβ binding protein 1 (TopBP1) is a modulating protein that plays an essential role in the response to DNA damage. The N-terminal region of TopBP1, which contains predicted BRCA1-carboxy terminal (BRCT) domains 1 and 2, binds to Rad9, a component of the cell cycle checkpoint clamp Rad9-Hus1-Rad1 complex. Here, we report the crystal structure of the TopBP1N-terminal region (residues 1-290) at 2.4Å resolution. Interestingly, in addition to the predicted tandem BRCT1-2 repeats (residues 103-284), residues 7-98 form a previously unreported BRCT domain (here, BRCT0). In contrast to both BRCT1 and BRCT2, which possess the conventional phosphopeptide binding residues within a surface pocket, the corresponding pocket in BRCT0 is largely hydrophobic. Structural comparisons together with peptide binding studies indicate that the tandem BRCT1-2 domains are the binding region for phosphorylated Ser387 in Rad9.


    Organizational Affiliation

    National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Chaoyang District, Beijing 100101, China.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA topoisomerase 2-binding protein 1 X298Homo sapiensMutation(s): 0 
Gene Names: TOPBP1KIAA0259
Find proteins for Q92547 (Homo sapiens)
Explore Q92547 
Go to UniProtKB:  Q92547
NIH Common Fund Data Resources
PHAROS:  Q92547
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
XL-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.223 
  • Space Group: P 21 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 115.73α = 90
b = 115.73β = 90
c = 115.73γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
SHELXSphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-03-30
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance