6IUA

Crystal structure of importin-alpha1 bound to the 53BP1 nuclear localization signal (S1678D)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.179 
  • R-Value Work: 0.155 
  • R-Value Observed: 0.156 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

Structural and biochemical characterization of the recognition of the 53BP1 nuclear localization signal by importin-alpha.

Matsuura, Y.

(2019) Biochem Biophys Res Commun 510: 236-241

  • DOI: https://doi.org/10.1016/j.bbrc.2019.01.075
  • Primary Citation of Related Structures:  
    6IU7, 6IUA

  • PubMed Abstract: 

    53BP1 (TP53-binding protein 1) plays a key role in DNA double-strand break repair by promoting non-homologous end joining (NHEJ) especially during G1 phase of the cell cycle. Nuclear import of 53BP1 is required for proper localization of 53BP1 and maintenance of genome integrity. 53BP1 has a classical bipartite nuclear localization signal (NLS) of sequence 1666-GKRKLITSEEERSPAKRGRKS-1686. Ser1678 within the 53BP1 NLS can be phosphorylated by CDK1/cyclin B, and a phosphomimetic substitution of Ser1678 with aspartate has been shown to negatively regulate nuclear import of 53BP1. Here, the X-ray crystal structures of the nuclear import adaptor importin-α1 bound to the wild-type 53BP1 NLS and the S1678D mutant of 53BP1 NLS are reported at resolutions of 1.9 and 1.7 Å, respectively. In the wild-type structure, not only the two basic clusters of the 53BP1 NLS but also the linker region between the basic clusters made extensive interactions with importin-α1. In the mutant structure, the linker region between the basic clusters in the 53BP1 NLS made fewer interactions with importin-α1 than those observed in the wild-type structure. However, biochemical binding assays using purified proteins showed that the 53BP1 mutation S1678D reduces the binding affinity to importin-α1 only to a modest extent. Implications of these findings for regulatory mechanism of 53BP1 nuclear import are discussed.


  • Organizational Affiliation

    Division of Biological Science, Graduate School of Science, Nagoya University, Japan; Structural Biology Research Center, Graduate School of Science, Nagoya University, Japan. Electronic address: matsuura.yoshiyuki@d.mbox.nagoya-u.ac.jp.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Importin subunit alpha-1427Mus musculusMutation(s): 0 
Gene Names: Kpna2Rch1
UniProt & NIH Common Fund Data Resources
Find proteins for P52293 (Mus musculus)
Explore P52293 
Go to UniProtKB:  P52293
IMPC:  MGI:103561
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP52293
Sequence Annotations
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  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Peptide from TP53-binding protein 122Homo sapiensMutation(s): 1 
Gene Names: TP53BP1
UniProt & NIH Common Fund Data Resources
Find proteins for Q12888 (Homo sapiens)
Explore Q12888 
Go to UniProtKB:  Q12888
PHAROS:  Q12888
GTEx:  ENSG00000067369 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ12888
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.179 
  • R-Value Work: 0.155 
  • R-Value Observed: 0.156 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 79.26α = 90
b = 90.17β = 90
c = 97.12γ = 90
Software Package:
Software NamePurpose
Aimlessdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
MOSFLMdata reduction
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

  • Released Date: 2019-01-30 
  • Deposition Author(s): Matsuura, Y.

Revision History  (Full details and data files)

  • Version 1.0: 2019-01-30
    Type: Initial release
  • Version 1.1: 2019-02-20
    Changes: Data collection, Database references
  • Version 1.2: 2023-11-22
    Changes: Data collection, Database references, Refinement description