2BKU

Kap95p:RanGTP complex

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.223 
  • R-Value Observed: 0.226 

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


Literature

Structural Basis for Nuclear Import Complex Dissociation by Rangtp

Lee, S.J., Matsuura, Y., Liu, S.M., Stewart, M.

(2005) Nature 435: 693

  • DOI: 10.1038/nature03578
  • Primary Citation of Related Structures:  
    2BKU

  • PubMed Abstract: 

    • Nuclear protein import is mediated mainly by the transport factor importin-beta that binds cytoplasmic cargo, most often via the importin-alpha adaptor, and then transports it through nuclear pore complexes. This active transport is driven by disassembly of the import complex by nuclear RanGTP ...

    Nuclear protein import is mediated mainly by the transport factor importin-beta that binds cytoplasmic cargo, most often via the importin-alpha adaptor, and then transports it through nuclear pore complexes. This active transport is driven by disassembly of the import complex by nuclear RanGTP. The switch I and II loops of Ran change conformation with nucleotide state, and regulate its interactions with nuclear trafficking components. Importin-beta consists of 19 HEAT repeats that are based on a pair of antiparallel alpha-helices (referred to as the A- and B-helices). The HEAT repeats stack to yield two C-shaped arches, linked together to form a helicoidal molecule that has considerable conformational flexibility. Here we present the structure of full-length yeast importin-beta (Kap95p or karyopherin-beta) complexed with RanGTP, which provides a basis for understanding the crucial cargo-release step of nuclear import. We identify a key interaction site where the RanGTP switch I loop binds to the carboxy-terminal arch of Kap95p. This interaction produces a change in helicoidal pitch that locks Kap95p in a conformation that cannot bind importin-alpha or cargo. We suggest an allosteric mechanism for nuclear import complex disassembly by RanGTP.

    Organizational Affiliation: 

    MRC Laboratory of Molecular Biology, Hills Rd, Cambridge CB2 2QH, UK.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
GTP-BINDING NUCLEAR PROTEIN RANA, C177Canis lupus familiarisMutation(s): 0 
Gene Names: RAN
UniProt
Find proteins for P62825 (Canis lupus familiaris)
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Go to UniProtKB:  P62825
Entity Groups  
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UniProt GroupP62825
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
IMPORTIN BETA-1 SUBUNITB, D861Saccharomyces cerevisiaeMutation(s): 0 
UniProt
Find proteins for Q06142 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore Q06142 
Go to UniProtKB:  Q06142
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ06142
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GTP
Query on GTP
Download Ideal Coordinates CCD File 
E [auth A],
G [auth C]		GUANOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O14 P3
XKMLYUALXHKNFT-UUOKFMHZSA-N		 Ligand Interaction
MG
Query on MG
Download Ideal Coordinates CCD File 
F [auth A],
H [auth C]		MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.223 
  • R-Value Observed: 0.226 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 107.021α = 90
b = 127.879β = 90
c = 161.741γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
CCP4data scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-05-04
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance