5GXW

Importin and NuMA complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.39 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.186 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Regulation of mitotic spindle assembly factor NuMA by Importin-beta

Chang, C.-C.Huang, T.-L.Shimamoto, Y.Tsai, S.-Y.Hsia, K.-C.

(2017) J Cell Biol 216: 3453-3462

  • DOI: 10.1083/jcb.201705168
  • Primary Citation of Related Structures:  
    5GXW

  • PubMed Abstract: 
  • Ran-guanosine triphosphatase orchestrates mitotic spindle assembly by modulation of the interaction between Importin-α/-β and spindle assembly factors (SAFs). The inhibition of SAFs performed by importins needs to be done without much sequestration f ...

    Ran-guanosine triphosphatase orchestrates mitotic spindle assembly by modulation of the interaction between Importin-α/-β and spindle assembly factors (SAFs). The inhibition of SAFs performed by importins needs to be done without much sequestration from abundant nuclear localization signal (NLS) -containing proteins. However, the molecular mechanisms that determine NLS-binding selectivity and that inhibit activity of Importin-β-regulated SAFs (e.g., nuclear mitotic apparatus protein [NuMA]) remain undefined. Here, we present a crystal structure of the Importin-α-NuMA C terminus complex showing a novel binding pattern that accounts for selective NLS recognition. We demonstrate that, in the presence of Importin-α, Importin-β inhibits the microtubule-binding function of NuMA. Further, we have identified a high-affinity microtubule-binding region that lies carboxyl-terminal to the NLS, which is sterically masked by Importin-β on being bound by Importin-α. Our study provides mechanistic evidence of how Importin-α/-β regulates the NuMA functioning required for assembly of higher-order microtubule structures, further illuminating how Ran-governed transport factors regulate diverse SAFs and accommodate various cell demands.


    Organizational Affiliation

    Institute of Biochemistry and Molecular Biology, College of Life Sciences, National Yang-Ming University, Taipei, Taiwan.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Peptide from Nuclear mitotic apparatus protein 1B27Homo sapiensMutation(s): 0 
Gene Names: NUMA1NMP22NUMA
Find proteins for Q14980 (Homo sapiens)
Explore Q14980 
Go to UniProtKB:  Q14980
NIH Common Fund Data Resources
PHAROS  Q14980
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Importin subunit alpha-1A428Mus 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
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.39 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.186 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 78.065α = 90
b = 89.658β = 90
c = 101.187γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
MOSTTaiwan--

Revision History 

  • Version 1.0: 2017-10-04
    Type: Initial release
  • Version 1.1: 2017-11-22
    Changes: Database references