3Q5U

A minimal NLS from human scramblase 4 complexed with importin alpha


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.189 

wwPDB Validation 3D Report Full Report


This is version 1.5 of the entry. See complete history


Literature

A Minimal Nuclear Localization Signal (NLS) in Human Phospholipid Scramblase 4 That Binds Only the Minor NLS-binding Site of Importin {alpha}1.

Lott, K.Bhardwaj, A.Sims, P.J.Cingolani, G.

(2011) J Biol Chem 286: 28160-28169

  • DOI: 10.1074/jbc.M111.228007
  • Primary Citation of Related Structures:  
    3Q5U

  • PubMed Abstract: 
  • Importin α1 can bind classical nuclear localization signals (NLSs) in two NLS-binding sites, known as "major" and "minor." The major site is located between ARM repeats 2-4, whereas the minor site spans ARM 7-8. In this study, we have characterized t ...

    Importin α1 can bind classical nuclear localization signals (NLSs) in two NLS-binding sites, known as "major" and "minor." The major site is located between ARM repeats 2-4, whereas the minor site spans ARM 7-8. In this study, we have characterized the cellular localization of human phospholipid scramblase 4 (hPLSCR4), a member of the phospholipid scramblase protein family. We identified a minimal NLS in hPLSCR4 ((273)GSIIRKWN(280)) that contains only two basic amino acids. This NLS is both necessary for nuclear localization of hPLSCR4 in transfected HeLa cells and sufficient for nuclear import of a non-diffusible cargo in permeabilized cells. Mutation of only one of the two basic residues, Arg(277), correlates with loss of nuclear localization, suggesting this amino acid plays a key role in nuclear transport. Crystallographic analysis of mammalian importin α1 in complex with the hPLSCR4-NLS reveals this minimal NLS binds specifically and exclusively to the minor binding site of importin α. These data provide the first structural and functional evidence of a novel NLS-binding mode in importin α1 that uses only the minor groove as the exclusive site for nuclear import of nonclassical cargos.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, Thomas Jefferson University, Philadelphia, Pennsylvania 19107, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Importin subunit alpha-2A460Mus musculusMutation(s): 0 
Gene Names: Kpna2Rch1
Find proteins for P52293 (Mus musculus)
Explore P52293 
Go to UniProtKB:  P52293
NIH Common Fund Data Resources
IMPC  MGI:103561
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Phospholipid scramblase 4B13N/AMutation(s): 0 
Find proteins for Q9NRQ2 (Homo sapiens)
Explore Q9NRQ2 
Go to UniProtKB:  Q9NRQ2
NIH Common Fund Data Resources
PHAROS  Q9NRQ2
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.189 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 77.451α = 90
b = 90.973β = 90
c = 96.895γ = 90
Software Package:
Software NamePurpose
CrysalisProdata collection
PHENIXrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-06-29
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2011-07-20
    Changes: Database references
  • Version 1.3: 2011-08-24
    Changes: Database references
  • Version 1.4: 2017-11-08
    Changes: Refinement description
  • Version 1.5: 2018-03-07
    Changes: Data collection