3W3Z

Crystal structure of Kap121p bound to RanGTP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.261 
  • R-Value Observed: 0.262 

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Literature

Structural basis for cell-cycle-dependent nuclear import mediated by the karyopherin Kap121p.

Kobayashi, J.Matsuura, Y.

(2013) J Mol Biol 425: 1852-1868

  • DOI: 10.1016/j.jmb.2013.02.035
  • Primary Citation of Related Structures:  
    3W3T, 3W3U, 3W3V, 3W3W, 3W3X, 3W3Y, 3W3Z

  • PubMed Abstract: 
  • Kap121p (also known as Pse1p) is an essential karyopherin that mediates nuclear import of a plethora of cargoes including cell cycle regulators, transcription factors, and ribosomal proteins in Saccharomyces cerevisiae. It has been proposed that the spindle assembly checkpoint signaling triggers molecular rearrangements of nuclear pore complexes and thereby arrests Kap121p-mediated nuclear import at metaphase, while leaving import mediated by other karyopherins unaffected ...

    Kap121p (also known as Pse1p) is an essential karyopherin that mediates nuclear import of a plethora of cargoes including cell cycle regulators, transcription factors, and ribosomal proteins in Saccharomyces cerevisiae. It has been proposed that the spindle assembly checkpoint signaling triggers molecular rearrangements of nuclear pore complexes and thereby arrests Kap121p-mediated nuclear import at metaphase, while leaving import mediated by other karyopherins unaffected. The Kap121p-specific import inhibition is required for normal progression through mitosis. To understand the structural basis for Kap121p-mediated nuclear import and its unique regulatory mechanism during mitosis, we determined crystal structures of Kap121p in isolation and also in complex with either its import cargoes or nucleoporin Nup53p or RanGTP. Kap121p has a superhelical structure composed of 24 HEAT repeats. The structures of Kap121p-cargo complexes define a non-conventional nuclear localization signal (NLS) that has a consensus sequence of KV/IxKx1-2K/H/R. The structure of Kap121p-Nup53p complex shows that cargo and Nup53p compete for the same high-affinity binding site, explaining how Nup53p binding forces cargo release when the Kap121p-binding site of Nup53p is exposed during mitosis. Comparison of the NLS and RanGTP complexes reveals that RanGTP binding not only occludes the cargo-binding site but also forces Kap121p into a conformation that is incompatible with NLS recognition.


    Organizational Affiliation

    Division of Biological Science, Graduate School of Science, Nagoya University, Japan; Structural Biology Research Center, Graduate School of Science, Nagoya University, Japan. Electronic address: matsuura.yoshiyuki@d.mbox.nagoya-u.ac.jp.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Importin subunit beta-3A1089Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: PSE1KAP121YMR308CYM9952.10C
UniProt
Find proteins for P32337 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P32337 
Go to UniProtKB:  P32337
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP32337
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
GTP-binding nuclear protein RanB176Canis lupus familiarisMutation(s): 0 
Gene Names: RAN
UniProt
Find proteins for P62825 (Canis lupus familiaris)
Explore P62825 
Go to UniProtKB:  P62825
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP62825
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GTP
Query on GTP

Download Ideal Coordinates CCD File 
D [auth B]GUANOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O14 P3
XKMLYUALXHKNFT-UUOKFMHZSA-N
 Ligand Interaction
MG
Query on MG

Download Ideal Coordinates CCD File 
C [auth B]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.298 
  • R-Value Work: 0.261 
  • R-Value Observed: 0.262 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 97.75α = 90
b = 97.75β = 90
c = 289.981γ = 120
Software Package:
Software NamePurpose
BSSdata collection
PHASERphasing
REFMACrefinement
MOSFLMdata reduction
Aimlessdata scaling

Structure Validation

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Ligand Structure Quality Assessment 



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-04-10
    Type: Initial release
  • Version 1.1: 2014-01-29
    Changes: Database references