6IUA

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.179 
  • R-Value Work: 0.155 

wwPDB Validation 3D Report Full Report


This is version 1.1 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: 10.1016/j.bbrc.2019.01.075
  • Primary Citation of Related Structures:  

  • 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 ma ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Importin subunit alpha-1
A
427Mus musculusMutation(s): 0 
Gene Names: Kpna2 (Rch1)
Find proteins for P52293 (Mus musculus)
Go to UniProtKB:  P52293
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Peptide from TP53-binding protein 1
B
22Homo sapiensMutation(s): 1 
Gene Names: TP53BP1
Find proteins for Q12888 (Homo sapiens)
Go to Gene View: TP53BP1
Go to UniProtKB:  Q12888
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.179 
  • R-Value Work: 0.155 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 79.260α = 90.00
b = 90.170β = 90.00
c = 97.120γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
MOLREPphasing
PDB_EXTRACTdata extraction
MOSFLMdata reduction
Aimlessdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2018-11-27 
  • Released Date: 2019-01-30 
  • Deposition Author(s): Matsuura, Y.

Revision History 

  • Version 1.0: 2019-01-30
    Type: Initial release
  • Version 1.1: 2019-02-20
    Type: Data collection, Database references