2C1T

Structure of the Kap60p:Nup2 complex

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.205 

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This is version 1.2 of the entry. See complete history. 


Literature

Nup50/Npap60 Function in Nuclear Import Complex Disassembly and Importin Recycling

Matsuura, Y., Stewart, M.

(2005) EMBO J 24: 3681

  • DOI: 10.1038/sj.emboj.7600843
  • Primary Citation of Related Structures:  
    2C1M, 2C1T

  • PubMed Abstract: 

    • Nuclear import of proteins containing classical nuclear localization signals (NLS) is mediated by the importin-alpha:beta complex that binds cargo in the cytoplasm and facilitates its passage through nuclear pores, after which nuclear RanGTP dissociates the import complex and the importins are recycled ...

    Nuclear import of proteins containing classical nuclear localization signals (NLS) is mediated by the importin-alpha:beta complex that binds cargo in the cytoplasm and facilitates its passage through nuclear pores, after which nuclear RanGTP dissociates the import complex and the importins are recycled. In vertebrates, import is stimulated by nucleoporin Nup50, which has been proposed to accompany the import complex through nuclear pores. However, we show here that the Nup50 N-terminal domain actively displaces NLSs from importin-alpha, which would be more consistent with Nup50 functioning to coordinate import complex disassembly and importin recycling. The crystal structure of the importin-alpha:Nup50 complex shows that Nup50 binds at two sites on importin-alpha. One site overlaps the secondary NLS-binding site, whereas the second extends along the importin-alpha C-terminus. Mutagenesis indicates that interaction at both sites is required for Nup50 to displace NLSs. The Cse1p:Kap60p:RanGTP complex structure suggests how Nup50 is then displaced on formation of the importin-alpha export complex. These results provide a rationale for understanding the series of interactions that orchestrate the terminal steps of nuclear protein import.

    Organizational Affiliation: 

    MRC Laboratory of Molecular Biology, Cambridge, UK.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
IMPORTIN ALPHA SUBUNITA, B454Saccharomyces cerevisiaeMutation(s): 1 
UniProt
Find proteins for Q02821 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Go to UniProtKB:  Q02821
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UniProt GroupQ02821
Protein Feature View
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
NUCLEOPORIN NUP2C, D51Saccharomyces cerevisiaeMutation(s): 0 
UniProt
Find proteins for P32499 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P32499 
Go to UniProtKB:  P32499
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UniProt GroupP32499
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.203 
  • R-Value Observed: 0.205 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 129.813α = 90
b = 140.076β = 90
c = 63.99γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-11-22
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance