6K06

Crystal structure of Importin-alpha and phosphomimetic GM130


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.199 
  • R-Value Work: 0.172 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Ran pathway-independent regulation of mitotic Golgi disassembly by Importin-alpha.

Chang, C.-C.Chen, C.-J.Grauffel, C.Pien, Y.-C.Lim, C.Tsai, S.-Y.Hsia, K.-C.

(2019) Nat Commun 10: 4307-4307

  • DOI: https://doi.org/10.1038/s41467-019-12207-4
  • Primary Citation of Related Structures:  
    6IW8, 6IWA, 6K06

  • PubMed Abstract: 

    To facilitate proper mitotic cell partitioning, the Golgi disassembles by suppressing vesicle fusion. However, the underlying mechanism has not been characterized previously. Here, we report a Ran pathway-independent attenuation mechanism that allows Importin-α (a nuclear transport factor) to suppress the vesicle fusion mediated by p115 (a vesicular tethering factor) and is required for mitotic Golgi disassembly. We demonstrate that Importin-α directly competes with p115 for interaction with the Golgi protein GM130. This interaction, promoted by a phosphate moiety on GM130, is independent of Importin-β and Ran. A GM130 K34A mutant, in which the Importin-α-GM130 interaction is specifically disrupted, exhibited abundant Golgi puncta during metaphase. Importantly, a mutant showing enhanced p115-GM130 interaction presented proliferative defects and G2/M arrest, demonstrating that Importin-α-GM130 binding modulates the Golgi disassembly that governs mitotic progression. Our findings illuminate that the Ran and kinase-phosphatase pathways regulate multiple aspects of mitosis coordinated by Importin-α (e.g. spindle assembly, Golgi disassembly).


  • Organizational Affiliation

    Institute of Molecular Biology, Academia Sinica, Taipei, 11529, Taiwan.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Peptide from Golgin subfamily A member 253Homo sapiensMutation(s): 1 
Gene Names: GOLGA2
UniProt & NIH Common Fund Data Resources
Find proteins for Q08379 (Homo sapiens)
Explore Q08379 
Go to UniProtKB:  Q08379
PHAROS:  Q08379
GTEx:  ENSG00000167110 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ08379
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Importin subunit alpha-1B [auth C]433Mus 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
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.199 
  • R-Value Work: 0.172 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73.734α = 90
b = 79.001β = 90
c = 89.569γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Ministry of Science and Technology (Taiwan)Taiwan106-2311-B-001 -038 -MY3

Revision History  (Full details and data files)

  • Version 1.0: 2019-10-02
    Type: Initial release
  • Version 1.1: 2023-11-22
    Changes: Data collection, Database references, Refinement description