4B18

The crystal structure of human Importin alpha 5 with TERT NLS peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.52 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.201 

wwPDB Validation   3D Report Full Report


This is version 1.5 of the entry. See complete history


Literature

Akt-Mediated Phosphorylation Increases the Binding Affinity of Htert for Importin Alpha to Promote Nuclear Translocation.

Jeong, S.A.Kim, K.Lee, J.H.Cha, J.S.Khadka, P.Cho, H.Chung, I.K.

(2015) J Cell Sci 128: 2287

  • DOI: https://doi.org/10.1242/jcs.166132
  • Primary Citation of Related Structures:  
    4B18

  • PubMed Abstract: 

    Telomeres are essential for chromosome integrity and protection, and their maintenance requires the ribonucleoprotein enzyme telomerase. Previously, we have shown that human telomerase reverse transcriptase (hTERT) contains a bipartite nuclear localization signal (NLS; residues 222-240) that is responsible for nuclear import, and that Akt-mediated phosphorylation of residue S227 is important for efficient nuclear import of hTERT. Here, we show that hTERT binds to importin-α proteins through the bipartite NLS and that this heterodimer then forms a complex with importin-β proteins to interact with the nuclear pore complex. Depletion of individual importin-α proteins results in a failure of hTERT nuclear import, and the resulting cytoplasmic hTERT is degraded by ubiquitin-dependent proteolysis. Crystallographic analysis reveals that the bipartite NLS interacts with both the major and minor sites of importin-α proteins. We also show that Akt-mediated phosphorylation of S227 increases the binding affinity for importin-α proteins and promotes nuclear import of hTERT, thereby resulting in increased telomerase activity. These data provide details of a binding mechanism that enables hTERT to interact with the nuclear import receptors and of the control of the dynamic nuclear transport of hTERT through phosphorylation.


  • Organizational Affiliation

    Department of Systems Biology, College of Life Science and Biotechnology, Yonsei University, Seoul 120-749, Korea hscho8@yonsei.ac.kr topoviro@yonsei.ac.kr.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
IMPORTIN SUBUNIT ALPHA-1447Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P52294 (Homo sapiens)
Explore P52294 
Go to UniProtKB:  P52294
PHAROS:  P52294
GTEx:  ENSG00000114030 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP52294
Sequence Annotations
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  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
TELOMERASE REVERSE TRANSCRIPTASE20Homo sapiensMutation(s): 0 
EC: 2.7.7.49
UniProt & NIH Common Fund Data Resources
Find proteins for O14746 (Homo sapiens)
Explore O14746 
Go to UniProtKB:  O14746
PHAROS:  O14746
GTEx:  ENSG00000164362 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO14746
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.52 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.201 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 159.723α = 90
b = 59.916β = 96.29
c = 69.331γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
SCALEPACKdata scaling
MOLREPphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-09-04
    Type: Initial release
  • Version 1.1: 2015-04-22
    Changes: Database references
  • Version 1.2: 2015-04-29
    Changes: Derived calculations, Source and taxonomy
  • Version 1.3: 2015-06-24
    Changes: Database references
  • Version 1.4: 2015-07-01
    Changes: Database references
  • Version 1.5: 2023-12-20
    Changes: Data collection, Database references, Other, Refinement description